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Ubergraph

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UBERON_0000002 UBPROP_0000003 "The evolution of mammals is associated with radical changes in their reproductive biology, particularly the structure and function of the female reproductive organs. These changes include the evolution of the uterus, cervix, vagina, placenta and specialized cell types associated with each of those structures.[well established][VHOG]" @default.
UBERON_0000003 UBPROP_0000003 "Naris refer to the external and interior naris (choana) of tetrapods, and to anterior and posterior naris of zebrafish. It seems now accepted that the structure is homologous: The choana, a unique 'internal nostril' opening from the nasal sac into the roof of the mouth, is a key part of the tetrapod (land vertebrate) respiratory system. It was the first component of the tetrapod body plan to evolve, well before the origin of limbs, and is therefore crucial to our understanding of the beginning of the fish-tetrapod transition. (...) Here we present new material of Kenichthys, a 395-million-year-old fossil fish from China, that provides direct evidence for the origin of the choana and establishes its homology: it is indeed a displaced posterior external nostril that, during a brief transitional stage illustrated by Kenichthys, separated the maxilla from the premaxilla.[well established][VHOG]" @default.
UBERON_0000006 UBPROP_0000003 "Mammals, birds, reptiles and amphibians have a pancreas with similar histology and mode of development, while in some fish, the islet cells are segregated as Brockmann bodies.[well established][VHOG]" @default.
UBERON_0000007 UBPROP_0000003 "It (the hypophysis) develops embryonically in all vertebrates from two ectodermal evaginations that meet and unite. (...) A well-developed hypophyseal system with functional connections to the hypothalamus is unique to craniates.[well established][VHOG]" @default.
UBERON_0000010 UBPROP_0000003 "(...) specific vertebrate traits within the chordate phylum such as skeletal tissues, PNS, and spectacular head and brain development, are linked to the NC (neural crest) and its derivatives.[well established][VHOG]" @default.
UBERON_0000011 UBPROP_0000003 "In mammals, the autonomic nervous system is divided into two contrasting, antagonistic systems of control over visceral activity: the sympathetic system and the parasympathetic system (reference 1); In general, the teleosts may be considered phylogenetically the first class of vertebrates in which the heart is regulated by both sympathetic and parasympathetic neural pathways (reference 2).[well established][VHOG]" @default.
UBERON_0000013 UBPROP_0000003 "The autonomic nervous system is composed of three divisions: the sympathetic division, the parasympathetic division, and the enteric division. (...) In ray-finned teleost fishes, a sympathetic chain is present, and dual innervation of additional organs can be observed. A similar pattern can be found in amphibians (...). The evolution of the autonomic nervous system has been quite conservative, especially in the tetrapod lineage.[well established][VHOG]" @default.
UBERON_0000014 UBPROP_0000003 "(...) it is well-established that neural crest cells contribute to both the dermal skeleton (craniofacial bone, teeth, and the caudal fin rays of teleosts) and the integument, including craniofacial dermis and all pigment cells outside the retina (...).[well established][VHOG]" @default.
UBERON_0000016 UBPROP_0000003 "In the hagfish and lampreys (our most primitive vertebrate species of today), the first sign of 'a new organ' is found as collections of endocrine cells around the area of the bile duct connection with the duodenum. These endocrine organs are composed of 99% beta cells and 1% somatostatin-producing delta cells. Compared to the more primitive protochordates (e.g. amphioxus), this represents a stage where all previously scattered insulin-producing cells of the intestinal tissue have now quantitatively migrated to found a new organ involved in sensing blood glucose rather than gut glucose. Only later in evolution, the beta cells are joined by exocrine tissue and alpha cells (exemplified by the rat-, rabbit- and elephant-fishes). Finally, from sharks and onwards in evolution, we have the islet PP-cell entering to complete the pancreas.[well established][VHOG]" @default.
UBERON_0000017 UBPROP_0000003 "In the hagfish and lampreys (our most primitive vertebrate species of today), the first sign of 'a new organ' is found as collections of endocrine cells around the area of the bile duct connection with the duodenum. These endocrine organs are composed of 99% beta cells and 1% somatostatin-producing delta cells. Compared to the more primitive protochordates (e.g. amphioxus), this represents a stage where all previously scattered insulin-producing cells of the intestinal tissue have now quantitatively migrated to found a new organ involved in sensing blood glucose rather than gut glucose. Only later in evolution, the beta cells are joined by exocrine tissue and alpha cells (exemplified by the rat-, rabbit- and elephant-fishes). Finally, from sharks and onwards in evolution, we have the islet PP-cell entering to complete the pancreas.[well established][VHOG]" @default.
UBERON_0000019 UBPROP_0000003 "The eye of the adult lamprey is remarkably similar to our own, and it possesses numerous features (including the expression of opsin genes) that are very similar to those of the eyes of jawed vertebrates. The lamprey's camera-like eye has a lens, an iris and extra-ocular muscles (five of them, unlike the eyes of jawed vertebrates, which have six), although it lacks intra-ocular muscles. Its retina also has a structure very similar to that of the retinas of other vertebrates, with three nuclear layers comprised of the cell bodies of photoreceptors and bipolar, horizontal, amacrine and ganglion cells. The southern hemisphere lamprey, Geotria australis, possesses five morphological classes of retinal photoreceptor and five classes of opsin, each of which is closely related to the opsins of jawed vertebrates. Given these similarities, we reach the inescapable conclusion that the last common ancestor of jawless and jawed vertebrates already possessed an eye that was comparable to that of extant lampreys and gnathostomes. Accordingly, a vertebrate camera-like eye must have been present by the time that lampreys and gnathostomes diverged, around 500 Mya.[well established][VHOG]" @default.
UBERON_0000029 UBPROP_0000003 "Lymph nodes that are associated with the lymphatic system have evolved in mammals.[well established][VHOG]" @default.
UBERON_0000033 UBPROP_0000003 "Vertebrate evolution has been characterized by a fresh and vast array of cranial structures that collectively form the head.[well established][VHOG]" @default.
UBERON_0000043 UBPROP_0000003 "Phylogenetically, tendinous tissue first appears in the invertebrate chordate Branchiostoma as myosepta. This two-dimensional array of collagen fibers is highly organized, with fibers running along two primary axes. In hagfish the first linear tendons appear and the myosepta have developed specialized regions with unidirectional fiber orientation - a linear tendon within the flat sheet of myoseptum.[well established][VHOG]" @default.
UBERON_0000044 UBPROP_0000003 "From comparative analyses of craniate brains, a morphotype of the brain in the earliest craniate stock can be constructed. In marked contrast to cephalochordates, the ancestral craniate morphotype had a plethora of unique features, which included a telencephalon with pallial and subpallial parts, paired olfactory bulbs with substantial projections to most or all of the telencephalic pallium, paired lateral eyes and ears, a lateral line system for both electroreception and mechanoreception, spinal cord dorsal root ganglia, and an autonomic nervous system.[well established][VHOG]" @default.
UBERON_0000045 UBPROP_0000003 "Cranial sensory placodes are focused areas of the head ectoderm of vertebrates that contribute to the development of the cranial sense organs and their associated ganglia. Placodes have long been considered a key character of vertebrates, and their evolution is proposed to have been essential for the evolution of an active predatory lifestyle by early vertebrates.[well established][VHOG]" @default.
UBERON_0000056 UBPROP_0000003 "The first embryonic hint of a metanephros is the formation of the metanephric duct that appears as a ureteric diverticulum arising at the base of preexisting mesonephric duct. The ureteric diverticulum grows dorsally into the posterior region of the nephric ridge. Here it enlarges and stimulates the growth of metanephric tubules that come to make up the metanephric kidney. The metanephros becomes the adult kidney of amniotes, and the metanephric duct is usually called the ureter.[well established][VHOG]" @default.
UBERON_0000059 UBPROP_0000003 "Intestinal surface area also is increased in amphibians and reptiles by internal folds and occasionally by a few villi. The intestine can be divided into a small intestine and a slightly wider large intestine.[well established][VHOG]" @default.
UBERON_0000079 UBPROP_0000003 "By far, sexual reproduction is the more common pattern among living vertebrate forms and its widespread occurrence suggests that it is the plesiomorphic, or primitive, reproductive mode among the vertebrates.[well established][VHOG]" @default.
UBERON_0000080 UBPROP_0000003 "As the pronephros regresses, the archinephric duct induces the sequential differentiation of tubules in the more caudal parts of the nephric ridge. (...) Tubules that differentiate in the middle part of the nephric ridge form a kidney called the mesonephros. This kidney functions in the embryos and larvae of all vertebrates. (...) In all vertebrate embryos, the kidney begins with the differentiation of a few renal tubules from the anterior end of the nephric ridge overlying the pericardial cavity. (...) This early-developing embryonic kidney is called the pronephros.[well established][VHOG]" @default.
UBERON_0000081 UBPROP_0000003 "The ureteric diverticulum grows dorsally into the posterior region of the nephric ridge. Here it enlarges and stimulates the growth of metanephric tubules that come to make up the metanephric kidney. The metanephros becomes the adult kidney of amniotes.[well established][VHOG]" @default.
UBERON_0000083 UBPROP_0000003 "As the pronephros regresses, the archinephric duct induces the sequential differentiation of tubules in the more caudal parts of the nephric ridge. (...) Tubules that differentiate in the middle part of the nephric ridge form a kidney called the mesonephros. This kidney functions in the embryos and larvae of all vertebrates.[well established][VHOG]" @default.
UBERON_0000084 UBPROP_0000003 "The first embryonic hint of a metanephros is the formation of the metanephric duct that appears as a ureteric diverticulum arising at the base of preexisting mesonephric duct. The ureteric diverticulum grows dorsally into the posterior region of the nephric ridge. Here it enlarges and stimulates the growth of metanephric tubules that come to make up the metanephric kidney. The metanephros becomes the adult kidney of amniotes, and the metanephric duct is usually called the ureter.[well established][VHOG]" @default.
UBERON_0000086 UBPROP_0000003 "Outside the plasma membrane, three envelopes surround the ovum. The first, the primary egg envelope, lies between the plasma membrane and the surrounding cells of the ovary. The most consistent component of this primary layer is the vitelline membrane, a transparent jacket of fibrous protein. In mammals, the homologous structure is called the zona pellucida.[well established][VHOG]" @default.
UBERON_0000087 UBPROP_0000003 "A small sphere of cells known as the inner cell mass lies within the trophoblast (of all eutherian mammals).[well established][VHOG]" @default.
UBERON_0000089 UBPROP_0000003 "In mammal and avian, extraembryonic endoderm such as visceral endoderm and hypoblast play essential roles in the embryonic axis formation and germ layer development. These extraembryonic tissues are generally considered to have been created in ancestral amniotes evolved from the Xenopus-type ancestor (reference 1); The endomesoderm secretes as yet unidentified signals that posteriorize the ectoderm, which would otherwise adopt an anterior fate. Our results point to a conserved function at the base of deuterostomes for beta-catenin in germ layer specification and to a causal link in the definition of the posterior part of the embryonic ectoderm by way of activating posteriorizing endomesodermal factors (reference 2).[well established][VHOG]" @default.
UBERON_0000090 UBPROP_0000003 "In the development of many animals, a hollow blastula stage is formed during early embryogenesis. Such a hollow blastula is even regarded as an autapomorphy of Metazoa and is present already in some sponges.[well established][VHOG]" @default.
UBERON_0000106 UBPROP_0000003 "As in all metazoans, eumetazoan development begins with a fertilized egg, or zygote.[well established][VHOG]" @default.
UBERON_0000162 UBPROP_0000003 "A cloaca is apparently a primitive vertebrate feature because it occurs in most primitive gnathostomes and persists in the embryos of almost all vertebrates.[well established][VHOG]" @default.
UBERON_0000164 UBPROP_0000003 "In mammals the lowly monotremes still have a cloaca. Higher types have done away with this structure and have a separate anal outlet for the rectum. The monotreme cloaca shows the initiation of this subdivision. The cloaca has such includes only the distal part, roughly comparable to the proctodeum. The more proximal part is divided into (1) a large dorsal passage into which the intestine opens, the coprodeum, and (2) a ventral portion, the urodeum with which the bladder connects. (...) the development of the placental mammals recapitulates in many respects the phylogenetic story. In the sexually indifferent stage of placental mammal there is a cloaca. While the indifferent stage still persists, a septum develops, and extends out to the closing membrane. This divides the cloaca into two chambers: a coprodeum continuous with the gut above, and a urodeum or urogenital sinus below.[well established][VHOG]" @default.
UBERON_0000165 UBPROP_0000003 "Molecular and developmental cell lineage data suggest that the acoel mouth opening is homologous to the mouth of protostomes and deuterostomes and that the last common ancestor of the Bilateria (the 'urbilaterian') had only this single digestive opening.[well established][VHOG]" @default.
UBERON_0000166 UBPROP_0000003 "(...) mouth development is very similar in protostomes and 'basal' deuterostomes, whereas the chordate mouth seems to develop at a new position. Recent data for echinoderms and hemichordates further suggest that this change in mouth position may result from change in the influence of a conserved ectodermal patterning system on mouth development. It has been suggested that the mouths of vertebrates and urochordates may constitute a 'new' mouth.[well established][VHOG]" @default.
UBERON_0000167 UBPROP_0000003 "Echinoderms, hemichordates, and chordates are called deuterostomes because the mouth arises not from the blastopore but from a second invagination at the anterior end of the larva that pushes in to connect with the archenteron.[well established][VHOG]" @default.
UBERON_0000178 UBPROP_0000003 "Recent findings strongly suggest that the molecular pathways involved in the development and function of blood cells are highly conserved among vertebrates and various invertebrates phyla. (...) There is now good reason to believe that, in vertebrates and invertebrates alike, blood cell lineages diverge from a common type of progenitor cell, the hemocytoblast.[well established][VHOG]" @default.
UBERON_0000203 UBPROP_0000003 "In the anatomy of animals, an avian pallium is the dorsal telencephalon of a bird's brain. Pallium of avian species tend to be relatively large, comprising ~75% of the telencephalic volume." @default.
UBERON_0000210 UBPROP_0000003 "The homologization of cranial bones of actinopterygians with those of sarcopterygians based on the bone names established in human anatomy is favored in order to permit the building of phylogenetic relationship schemes beyond the taxonomic boundaries of osteichthyans (including tetrapods). (...) In actinopterygians, the terms parietal and postparietal bones have to replace the commonly used terms 'frontal' and 'parietal' bones for the two paired bones on the skull roof.[well established][VHOG]" @default.
UBERON_0000211 UBPROP_0000003 "Compared with their Ediacarian predecessor, Cambrian animals in general were characterized by their much stouter bodies. The stoutness of the body is likely due to the formation of ligaments and tendons, which in turn requires the crosslinking of collagen triple helices.[well established][VHOG]" @default.
UBERON_0000305 UBPROP_0000003 "Structures homologous to the four extraembryonic membranes of reptiles and birds appear in mammals: amnion, chorion, yolk sac, and allantois.[well established][VHOG]" @default.
UBERON_0000348 UBPROP_0000003 "The profundus nerve is a distinct nerve only in fishes. (...) In mammals, the profundus nerve is the same as the most rostral (ophthalmic) branch of the trigeminal nerve.[well established][VHOG]" @default.
UBERON_0000359 UBPROP_0000003 "There is debate about whether humans have functional homologues to preputial glands." @default.
UBERON_0000369 UBPROP_0000003 "Thus, certain telencephalic characters - such as the presence of a pallium divided into lateral, dorsal, and medial formations and a subpallium divided into striatum and septum - appear to characterize all vertebrates. They are primitive characters and are homologous among all vertebrates.[well established][VHOG]" @default.
UBERON_0000376 UBPROP_0000003 "Most anatomists now agree that the three proximal bones of the tetrapod limbs are homologous to the two or three proximal elements of the paired fin skeleton of other sarcopterygians, that is the humerus-femur, radius-tibia, and ulna-fibula.[well established][VHOG]" @default.
UBERON_0000378 UBPROP_0000003 "The lamprey head contains another group of muscles, the epi- and hypo-branchial muscles (EBM and HBM), derivatives of anterior trunk myotomes. (...) The origin and the migration pattern of HBM precursors are very similar to that of the gnathostome MPP, especially to that of the tongue muscle precursors. Other evidence of homology of lamprey HBM to the gnathostome tongue muscle is that HBM is innervated by the nerve termed the hypoglossal nerve based on its morphological position associated with the head/trunk interface. (...) The HBM-specific expression of the LampPax3/7 gene is consistent with the homology of this muscle to the gnathostome tongue muscle, or to the hypobranchial series as a whole (including the infrahyoid and possibly the diaphragm in mammals).[well established][VHOG]" @default.
UBERON_0000473 UBPROP_0000003 "(...) while it is likely that Urbilateria lacked a complex somatic reproductive system, it is at present impossible to speculate on whether or not it possessed a true gonad, let alone any other somatic adaptations for reproduction (reference 1); Examination of different vertebrate species shows that the adult gonad is remarkably similar in its morphology across different phylogenetic classes. Surprisingly, however, the cellular and molecular programs employed to create similar organs are not evolutionarily conserved (reference 2).[uncertain][VHOG]" @default.
UBERON_0000474 UBPROP_0000003 "By far, sexual reproduction is the more common pattern among living vertebrate forms and its widespread occurrence suggests that it is the plesiomorphic, or primitive, reproductive mode among the vertebrates.[well established][VHOG]" @default.
UBERON_0000482 UBPROP_0000003 "A basal lamina is certainly present in Bilateria and was evaluated as an autapomorphy of this taxon.[well established][VHOG]" @default.
UBERON_0000483 UBPROP_0000003 "The two basic types of metazoan tissue are epithelial and connective. The simplest metazoans, and developmental stages of many primitive invertebrates, consist solely of these two layers. Thus, epithelial and connective tissues may be the primary (original) tissues of metazoans, and both are important in the functional organization of animals.[well established][VHOG]" @default.
UBERON_0000923 UBPROP_0000003 "The Bilateria are triploblastic (with true endoderm, mesoderm, and ectoderm) (...).[well established][VHOG]" @default.
UBERON_0000924 UBPROP_0000003 "The Bilateria are triploblastic (with true endoderm, mesoderm, and ectoderm) (...).[well established][VHOG]" @default.
UBERON_0000925 UBPROP_0000003 "The Bilateria are triploblastic (with true endoderm, mesoderm, and ectoderm) (...).[well established][VHOG]" @default.
UBERON_0000926 UBPROP_0000003 "The Bilateria are triploblastic (with true endoderm, mesoderm, and ectoderm) (...).[well established][VHOG]" @default.
UBERON_0000935 UBPROP_0000003 "In all vertebrates the thin structure that connects the two halves of the telencephalon shows a ridge-like thickening at the basal side known as the anterior commissure.[well established][VHOG]" @default.
UBERON_0000941 UBPROP_0000003 "(...) an essentially similar sequence of events occurs during the embryonic development of the vertebrate eye. The eye initially develops as a single median evagination of the diencephalon that soon bifurcates to form the paired optic vesicles. As each optic vesicle grows towards the body surface, its proximal part narrows as the optic stalk, and its distal part invaginates to form a two-layered optic cup (reference 1); The (optic) stalk persists as the optic nerve (reference 2).[well established][VHOG]" @default.
UBERON_0000945 UBPROP_0000003 "It appears that the stomach has an ancient origin. The stomach first appears in the fish lineage. The prevertebrate chordates do not have a true stomach, whereas the cartilaginous and bony fish do. Although most fish do have a true stomach, some fish species appear to have lost the stomach secondarily. The remaining vertebrate lineages do have a true stomach (at least in the adult animal), although there is great variation in the size and shape of the stomach.[well established][VHOG]" @default.
UBERON_0000946 UBPROP_0000003 "Extensive conservation of valve developmental mechanisms also has been observed among vertebrate species including chicken, mouse, and human.[well established][VHOG]" @default.
UBERON_0000947 UBPROP_0000003 "When vertebrates first appeared, they must have possessed a ventral and dorsal aorta with aortic arches between them.[well established][VHOG]" @default.
UBERON_0000948 UBPROP_0000003 "As noted, the hearts of birds and mammals have four chambers that arises from the two chambers (atrium and ventricle) of the fish heart.[well established][VHOG]" @default.
UBERON_0000949 UBPROP_0000003 "Multicellular organisms have complex endocrine systems, allowing responses to environmental stimuli, regulation of development, reproduction, and homeostasis. Nuclear receptors (NRs), a metazoan-specific family of ligand-activated transcription factors, play central roles in endocrine responses, as intermediates between signaling molecules and target genes. The NR family includes ligand-bound and orphan receptors, that is, receptors with no known ligand or for which there is no ligand Pocket. Understanding NR evolution has been further improved by comparison of several completed genomes, particularly those of deuterostomes and ecdysozoans. In contrast, evolution of NR ligands is still much debated. One hypothesis proposes that several independent gains and losses of ligand-binding ability in NRs occurred in protostomes and deuterostomes. A second hypothesis, pertaining to the NR3 subfamily (vertebrate steroid hormone receptors and estrogen related receptor), proposes that before the divergence of protostomes and deuterostomes, there was an ancestral steroid receptor (AncSR) that was ligand-activated and that orphan receptors secondarily lost the ability to bind a ligand. (...) Our analysis reveals that steroidogenesis has been independently elaborated in the 3 main bilaterian lineages (...).[well established][VHOG]" @default.
UBERON_0000955 UBPROP_0000003 "(...) at some stage of its development, every chordate exhibits five uniquely derived characters or synapomorphies of the group: (...) (4) a single, tubular nerve cord that is located dorsal to the notochord (...) (reference 1); The neural tube is destined to differentiate into the brain and spinal cord (the central nervous system) (reference 2).[well established][VHOG]" @default.
UBERON_0000956 UBPROP_0000003 "Migration of neurons from the basal or striatal portions of the anterior part of the neural tube occurs to varying degrees in different vertebrate classes, but a true cerebral cortex is generally acknowledged to have made its first appearance in reptiles. The definition can be unambiguous, since 'cortex' simply implies the existence of a surface neuronal layer with an overlying 'zonal lamina' or 'molecular' layer containing dendrites and axons, which is separated from the underlying basal 'matrix' by white matter. Although reptilian cerebral cortex does indeed fulfill these conditions in certain locations, the separation from striatal structures is often indistinct, so that it may even be argued that some primitive dipnoans possess a pallium or cortex. Nevertheless, an extensive laminated layer separated by underlying white matter is well represented only in reptiles and mammals.[well established][VHOG]" @default.
UBERON_0000959 UBPROP_0000003 "The chiasm has been studied in great detail in some animals, while in others relatively little or nothing is known. Although there are some gross architectural features that are conserved within some animals, such as birds and fish, the general picture is one of diversity. This review will attempt to consider the key features of such diversity of chiasmatic organisation in vertebrates and the mechanisms that sculpt them from the limited literature that is available. However, as so much research has been undertaken on the structure and development of the chiasm in laboratory animals, any review must consider the information that has been gleaned from them and hope that future studies will determine whether the features revealed in these animals, and the underlying mechanisms that generate them, have a common vertebrate plan.[uncertain][VHOG]" @default.
UBERON_0000965 UBPROP_0000003 "The eye of the adult lamprey is remarkably similar to our own, and it possesses numerous features (including the expression of opsin genes) that are very similar to those of the eyes of jawed vertebrates. The lamprey's camera-like eye has a lens, an iris and extra-ocular muscles (five of them, unlike the eyes of jawed vertebrates, which have six), although it lacks intra-ocular muscles. Its retina also has a structure very similar to that of the retinas of other vertebrates, with three nuclear layers comprised of the cell bodies of photoreceptors and bipolar, horizontal, amacrine and ganglion cells. The southern hemisphere lamprey, Geotria australis, possesses five morphological classes of retinal photoreceptor and five classes of opsin, each of which is closely related to the opsins of jawed vertebrates. Given these similarities, we reach the inescapable conclusion that the last common ancestor of jawless and jawed vertebrates already possessed an eye that was comparable to that of extant lampreys and gnathostomes. Accordingly, a vertebrate camera-like eye must have been present by the time that lampreys and gnathostomes diverged, around 500 Mya.[well established][VHOG]" @default.
UBERON_0000966 UBPROP_0000003 "The eye of the adult lamprey is remarkably similar to our own, and it possesses numerous features (including the expression of opsin genes) that are very similar to those of the eyes of jawed vertebrates. The lamprey's camera-like eye has a lens, an iris and extra-ocular muscles (five of them, unlike the eyes of jawed vertebrates, which have six), although it lacks intra-ocular muscles. Its retina also has a structure very similar to that of the retinas of other vertebrates, with three nuclear layers comprised of the cell bodies of photoreceptors and bipolar, horizontal, amacrine and ganglion cells. The southern hemisphere lamprey, Geotria australis, possesses five morphological classes of retinal photoreceptor and five classes of opsin, each of which is closely related to the opsins of jawed vertebrates. Given these similarities, we reach the inescapable conclusion that the last common ancestor of jawless and jawed vertebrates already possessed an eye that was comparable to that of extant lampreys and gnathostomes. Accordingly, a vertebrate camera-like eye must have been present by the time that lampreys and gnathostomes diverged, around 500 Mya.[well established][VHOG]" @default.
UBERON_0000975 UBPROP_0000003 "Fishes lack a sternum. (...) A sternum is absent in the first fossil tetrapods, but it is present in modern amphibians. (...) Thus, a sternum occurs in some modern amphibians, birds, mammals and archosaurs. However, its absence in the common ancestors to these groups means that it has arisen independently several times within the field of the midventral connective tissue.[well established][VHOG]" @default.
UBERON_0000976 UBPROP_0000003 "Most anatomists now agree that the three proximal bones of the tetrapod limbs are homologous to the two or three proximal elements of the paired fin skeleton of other sarcopterygians, that is the humerus-femur, radius-tibia, and ulna-fibula.[well established][VHOG]" @default.
UBERON_0000978 UBPROP_0000003 "Most anatomists now agree that the three proximal bones of the tetrapod limbs are homologous to the two or three proximal elements of the paired fin skeleton of other sarcopterygians, that is the humerus-femur, radius-tibia, and ulna-fibula.[well established][VHOG]" @default.
UBERON_0000981 UBPROP_0000003 "Most anatomists now agree that the three proximal bones of the tetrapod limbs are homologous to the two or three proximal elements of the paired fin skeleton of other sarcopterygians, that is the humerus-femur, radius-tibia, and ulna-fibula.[well established][VHOG]" @default.
UBERON_0000988 UBPROP_0000003 "During the embryonic development of birds and mammals, neuroblasts migrate from the cerebellum into the ventral part of the rhombencephalon and differentiate into pontine and other nuclei, which relay information from between the cerebrum and cerebellum, and a conspicuous band of transverse fibers. This region is known as the pons. A pons does not differentiate in reptiles and anamniotes (...).[well established][VHOG]" @default.
UBERON_0000990 UBPROP_0000003 "Arguably, one of the most important aspects of urbilaterian organogenesis would have been gonadogenesis, since Urbilateria must have successfully generated gametes and developed a strategy for extrusion and fertilization, in order to be the ancestor of all living Bilateria.[well established][VHOG]" @default.
UBERON_0000991 UBPROP_0000003 "Examination of different vertebrate species shows that the adult gonad is remarkably similar in its morphology across different phylogenetic classes. Surprisingly, however, the cellular and molecular programs employed to create similar organs are not evolutionarily conserved.[uncertain][VHOG]" @default.
UBERON_0000992 UBPROP_0000003 "(...) while it is likely that Urbilateria lacked a complex somatic reproductive system, it is at present impossible to speculate on whether or not it possessed a true gonad, let alone any other somatic adaptations for reproduction (reference 1); Examination of different vertebrate species shows that the adult gonad is remarkably similar in its morphology across different phylogenetic classes. Surprisingly, however, the cellular and molecular programs employed to create similar organs are not evolutionarily conserved (reference 2).[uncertain][VHOG]" @default.
UBERON_0000993 UBPROP_0000003 "In all remaining vertebrates (i.e., coelacanths, lungfishes, amphibians, reptiles, birds, and mammals), the oviduct arises in ontogeny as a longitudinal, groovelike invagination of the coelomic epithelium on the lateral surface of the mesonephros.[well established][VHOG]" @default.
UBERON_0000995 UBPROP_0000003 "An infundibulum, uterine tube, uterus, and vagina also differentiate along the oviducts of eutherian mammals.[well established][VHOG]" @default.
UBERON_0000996 UBPROP_0000003 "The distal end of the oviducts differentiates as a vagina in Metatheria and Eutheria.[well established][VHOG]" @default.
UBERON_0000998 UBPROP_0000003 "(In mammalian testis) Along the way (the sperm travel), three accessory sex glands, the seminal vesicle, prostate, and bulbourethral (Cowper's) gland, respectively, add their secretions as sperm move from the testes to the urethra.[well established][VHOG]" @default.
UBERON_0001000 UBPROP_0000003 "The continuation of the archinephric duct, now called the deferent duct, extends caudally to the cloaca or to the part of the mammalian urethra that is derived from the cloaca.[well established][VHOG]" @default.
UBERON_0001003 UBPROP_0000003 "(...) outer epithelia in all metazoan animals are homologous. (...) The ancestor of all metazoans likely had an epidermis with a basal extracellular matrix (ECM), an apical extracellular glycocalyx, and one cilium with a striated rootlet per cell.[well established][VHOG]" @default.
UBERON_0001004 UBPROP_0000003 "There is no doubt that the primitive pattern of vertebrate air-breathing is the buccal pulse pump found in actinopterygian fishes.[well established][VHOG]" @default.
UBERON_0001008 UBPROP_0000003 "Evolution of vertebrate renal anatomy appears quite conservative when compared, for example, to evolution of respiratory and cardiovascular systems in vertebrates. Major anatomical changes in vertebrates kidneys separate those of birds and mammals from kidneys of lower vertebrates. General increase in animal size from fish to mammals is reflected by an increase in total number of nephrons per kidney, rather than by constant change in tubular dimensions.[well established][VHOG]" @default.
UBERON_0001009 UBPROP_0000003 "We should divest ourselves of the view that earlier vertebrate groups were 'on their way' to becoming mammals, as clearly they were not such visionaries. Neither were their systems 'imperfect' as earlier anatomists thought. Instead, their circulatory systems served them well to address the ecological demands arising from their lifestyles.[well established][VHOG]" @default.
UBERON_0001013 UBPROP_0000003 "Adipose tissue is unique to vertebrates. It is found in mostmammals, birds, reptiles and amphibians, and a variety is found in some species of fish. Furthermore, in insects the fat body found in larvae as well as in adults shares some homology with adipose tissue.[well established][VHOG]" @default.
UBERON_0001016 UBPROP_0000003 "Nervous systems evolved in the ancestor of Eumetazoa.[well established][VHOG]" @default.
UBERON_0001017 UBPROP_0000003 "(...) at some stage of its development, every chordate exhibits five uniquely derived characters or synapomorphies of the group: (...) (4) a single, tubular nerve cord that is located dorsal to the notochord (...) (reference 1); The neural tube is destined to differentiate into the brain and spinal cord (the central nervous system) (reference 2); Taken together, our data make a very strong case that the complex molecular mediolateral architecture of the developing trunk CNS (central nervous system), as shared between Platynereis and vertebrates, was already present in their last common ancestor, Urbilateria. The concept of bilaterian nervous system centralization implies that neuron types concentrate on one side of the trunk, as is the case in vertebrates and many invertebrates including Platynereis, where they segregate and become spatially organized (as opposed to a diffuse nerve net). Our data reveal that a large part of the spatial organization of the annelid and vertebrate CNS was already present in their last common ancestor, which implies that Urbilateria had already possessed a CNS (reference 3).[well established][VHOG]" @default.
UBERON_0001032 UBPROP_0000003 "An early step in the evolution of neural crest, therefore, may have been the origin of a specific dorsal neural cell population contributing to sensory processing; this would predate the divergence of the amphioxus and vertebrate lineages.[well established][VHOG]" @default.
UBERON_0001040 UBPROP_0000003 "Structures homologous to the four extraembryonic membranes of reptiles and birds appear in mammals: amnion, chorion, yolk sac, and allantois.[well established][VHOG]" @default.
UBERON_0001041 UBPROP_0000003 "The bilaterian gut is typically a complete tube that opens to the exterior at both ends. It consists of mouth, foregut, midgut, hindgut, and anus (reference 1); Although all vertebrates have a digestive tract and accessory glands, various parts of this system are not necessarily homologous, analogous, or even present in all species. Therefore, broad comparisons can be best made under the listings of headgut, foregut, midgut, pancreas and biliary system, hindgut (reference 2).[well established][VHOG]" @default.
UBERON_0001042 UBPROP_0000003 "(...) the earliest vertebrates possessed unjointed internal and external branchial arches, and musculature encircling the pharynx.[well established][VHOG]" @default.
UBERON_0001043 UBPROP_0000003 "The few structural specializations in (adult lampreys) pharynx include complex valves on the external gill openings that direct the tidal flow, and the division of the ancestral pharynx into an oesophagus and a respiratory pharynx.[well established][VHOG]" @default.
UBERON_0001044 UBPROP_0000003 "In air-feeding animals, the lack of water column to lubricate the food has been compensated for by the evolution of the salivary glands. These glands are present only in amniotes and are controlled by the parasympathetic system.[well established][VHOG]" @default.
UBERON_0001045 UBPROP_0000003 "The bilaterian gut is typically a complete tube that opens to the exterior at both ends. It consists of mouth, foregut, midgut, hindgut, and anus (reference 1); Although all vertebrates have a digestive tract and accessory glands, various parts of this system are not necessarily homologous, analogous, or even present in all species. Therefore, broad comparisons can be best made under the listings of headgut, foregut, midgut, pancreas and biliary system, hindgut (reference 2).[well established][VHOG]" @default.
UBERON_0001046 UBPROP_0000003 "The bilaterian gut is typically a complete tube that opens to the exterior at both ends. It consists of mouth, foregut, midgut, hindgut, and anus (reference 1); Although all vertebrates have a digestive tract and accessory glands, various parts of this system are not necessarily homologous, analogous, or even present in all species. Therefore, broad comparisons can be best made under the listings of headgut, foregut, midgut, pancreas and biliary system, hindgut (reference 2).[well established][VHOG]" @default.
UBERON_0001049 UBPROP_0000003 "(...) at some stage of its development, every chordate exhibits five uniquely derived characters or synapomorphies of the group: (...) (4) a single, tubular nerve cord that is located dorsal to the notochord (...).[well established][VHOG]" @default.
UBERON_0001064 UBPROP_0000003 "These data show that ducts within the zebrafish pancreas originally arise in situ from isolated progenitor cells rather than arising from reiterative branching of the pancreatic epithelium. This process of pancreatic duct formation in zebrafish may be analogous to the mechanism of duct formation in the mammalian mammary and salivary glands. (...) A related mechanism of duct formation has also been proposed to occur within the mammalian pancreatic epithelium.[uncertain][VHOG]" @default.
UBERON_0001069 UBPROP_0000003 "Hagfish and lampreys may have one or more endocrine buds - and later the vertebrate pancreas develop as independent ventral and dorsal buds that eventually fuse to become one organ.[well established][VHOG]" @default.
UBERON_0001072 UBPROP_0000003 "Phylogenetic modifications within this basic pattern of arteries and veins are largely correlated with functional changes. In the transition from water to land, gills gave way to lungs, accompanied by the establishment of a pulmonary circulation. In some fishes and certainly in tetrapods, the cardinal veins become less involved in blood return. Instead, the composite, prominent postcava (posterior vena cava) arose to drain the posterior part of the body and the precava (anterior vena cava) developed to drain the anterior part of the body.[well established][VHOG]" @default.
UBERON_0001074 UBPROP_0000003 "In hagfishes a transverse septum extends upward from the ventral body wall posterior to the heart, partly separating an anterior pericardial cavity from a larger peritoneal cavity. (...) These basic relationships have not been modified by urodeles. The small pericardial cavity remains far forward where it is separated by a transverse septum from the principal coelom, which may now be called a pleuroperitoneal cavity because slender lungs are present. (...) The heart (of other tetrapods) is separated from the lungs (and liver if present) by more or less horizontal partitions that have their origin in the embryo as folds on the serous membrane of the right and left lateral body walls. These grow out to join in the midline of the body. They are called lateral mesocardia (birds) or pleuropericardial membranes. Posteriorly they join the transverse septum to form the adult pericardial membrane, or pericardium. (...) In their partitioning of their coelom, embryonic mammals resemble first early fishes (incomplete partition, posterior to heart, consisting of the transverse septum) and then reptiles (pericardium derived from transverse septum and pleuropericardial membranes). Mammals then separate paired pleural cavities from the peritoneal cavity by a diaphragm. The ventral portion of this organ comes from the transverse septum. The dorsal portion is derived from the dorsal mesentery and from still another pair of outgrowths from the lateral body wall, the pleuroperitoneal membranes.[well established][VHOG]" @default.
UBERON_0001083 UBPROP_0000003 "As noted, the hearts of birds and mammals have four chambers that arises from the two chambers (atrium and ventricle) of the fish heart.[uncertain][VHOG]" @default.
UBERON_0001091 UBPROP_0000003 "The ancestor of recent vertebrate teeth was a tooth-like structure on the outer body surface of jawless fishes.[well established][VHOG]" @default.
UBERON_0001103 UBPROP_0000003 "The mammals are characterized by a diaphragm, which separates the thoracic portion of the body cavity from the abdominal region and assists in drawing air into the lungs and forcing it out. Modern reptiles lack a muscular diaphragm and it is reasonable to suppose that the diaphragm developed as a new device that made possible a large degree of oxygen intake for active animals. The change may have taken place during the transition from reptile to mammal (...).[well established][VHOG]" @default.
UBERON_0001105 UBPROP_0000003 "In early tetrapods, the connecting skull bone, the posttemporal, and adjoining shoulder bones, supracleithrum and postcleithrum (=anocleithrum), are absent, leaving a dermal shoulder girdle composed of the remaining ventral elements: the paired cleithrum and clavicle, and an unpaired midventral interclavicle that joins both halves of the girdle across the midline. (...) Several dermal elements of the shoulder persist in early synapsids. The clavicle and interclavicle are present in therapsids and monotremes, but in marsupials and placentals, the interclavicle is absent, the clavicle often is reduced in size, and the scapula becomes the predominant shoulder element.[well established][VHOG]" @default.