FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2068950617> ?p ?o ?g. }

• W2068950617 endingPage "166" @default.
• W2068950617 startingPage "125" @default.
• W2068950617 abstract "The origin of birds and avian flight from within the archosaurian radiation has been among the most contentious issues in paleobiology. Although there is general agreement that birds are related to theropod dinosaurs at some level, debate centers on whether birds are derived directly from highly derived theropods, the current dogma, or from an earlier common ancestor lacking suites of derived anatomical characters. Recent discoveries from the Early Cretaceous of China have highlighted the debate, with claims of the discovery of all stages of feather evolution and ancestral birds (theropod dinosaurs), although the deposits are at least 25 million years younger than those containing the earliest known bird Archaeopteryx. In the first part of the study we examine the fossil evidence relating to alleged feather progenitors, commonly referred to as protofeathers, in these putative ancestors of birds. Our findings show no evidence for the existence of protofeathers and consequently no evidence in support of the follicular theory of the morphogenesis of the feather. Rather, based on histological studies of the integument of modern reptiles, which show complex patterns of the collagen fibers of the dermis, we conclude that protofeathers are probably the remains of collagenous fiber meshworks that reinforced the dinosaur integument. These meshworks of the skin frequently formed aberrant patterns resembling feathers as a consequence of decomposition. Our findings also draw support from new paleontological evidence. We describe integumental structures, very similar to protofeathers, preserved within the rib area of a Psittacosaurus specimen from Nanjing, China, an ornithopod dinosaur unconnected with the ancestry of birds. These integumental structures show a strong resemblance to the collagenous fiber systems in the dermis of many animals. We also report the presence of scales in the forearm of the theropod ornithomimid (bird mimic) dinosaur, Pelecanimimus, from Spain. In the second part of the study we examine evidence relating to the most critical character thought to link birds to derived theropods, a tridactyl hand composed of digits 1-2-3. We maintain the evidence supports interpretation of bird wing digit identity as 2,3,4, which appears different from that in theropod dinosaurs. The phylogenetic significance of Chinese microraptors is also discussed, with respect to bird origins and flight origins. We suggest that a possible solution to the disparate data is that Aves plus bird-like maniraptoran theropods (e.g., microraptors and others) may be a separate clade, distinctive from the main lineage of Theropoda, a remnant of the early avian radiation, exhibiting all stages of flight and flightlessness." @default.
• W2068950617 created "2016-06-24" @default.
• W2068950617 creator A5005837771 @default.
• W2068950617 creator A5028079572 @default.
• W2068950617 creator A5060597599 @default.
• W2068950617 date "2005-01-01" @default.
• W2068950617 modified "2023-10-18" @default.
• W2068950617 title "Do feathered dinosaurs exist? Testing the hypothesis on neontological and paleontological evidence" @default.
• W2068950617 cites W124526783 @default.
• W2068950617 cites W1524136793 @default.
• W2068950617 cites W1572039271 @default.
• W2068950617 cites W1597858723 @default.
• W2068950617 cites W1616817409 @default.
• W2068950617 cites W1635242536 @default.
• W2068950617 cites W1650502593 @default.
• W2068950617 cites W1667761058 @default.
• W2068950617 cites W1680955625 @default.
• W2068950617 cites W1708772432 @default.
• W2068950617 cites W1853437144 @default.
• W2068950617 cites W1877656167 @default.
• W2068950617 cites W1963649579 @default.
• W2068950617 cites W1969109779 @default.
• W2068950617 cites W1971801600 @default.
• W2068950617 cites W1973634929 @default.
• W2068950617 cites W1974320804 @default.
• W2068950617 cites W1978304692 @default.
• W2068950617 cites W1980566989 @default.
• W2068950617 cites W1980923482 @default.
• W2068950617 cites W1983893853 @default.
• W2068950617 cites W1984321512 @default.
• W2068950617 cites W1984592685 @default.
• W2068950617 cites W1985053875 @default.
• W2068950617 cites W1986122989 @default.
• W2068950617 cites W1986498393 @default.
• W2068950617 cites W1991932752 @default.
• W2068950617 cites W1996234453 @default.
• W2068950617 cites W1998669447 @default.
• W2068950617 cites W2000286878 @default.
• W2068950617 cites W2004477458 @default.
• W2068950617 cites W2006075971 @default.
• W2068950617 cites W2008451474 @default.
• W2068950617 cites W2008806208 @default.
• W2068950617 cites W2009915379 @default.
• W2068950617 cites W2010357207 @default.
• W2068950617 cites W2013400941 @default.
• W2068950617 cites W2023291898 @default.
• W2068950617 cites W2026108752 @default.
• W2068950617 cites W2027452961 @default.
• W2068950617 cites W2031804596 @default.
• W2068950617 cites W2032035906 @default.
• W2068950617 cites W2034180004 @default.
• W2068950617 cites W2037195789 @default.
• W2068950617 cites W2038261602 @default.
• W2068950617 cites W2043121892 @default.
• W2068950617 cites W2045308252 @default.
• W2068950617 cites W2048456105 @default.
• W2068950617 cites W2051333393 @default.
• W2068950617 cites W2053763808 @default.
• W2068950617 cites W2056238916 @default.
• W2068950617 cites W2057112521 @default.
• W2068950617 cites W2063182841 @default.
• W2068950617 cites W2065029685 @default.
• W2068950617 cites W2072241673 @default.
• W2068950617 cites W2074170468 @default.
• W2068950617 cites W2075639475 @default.
• W2068950617 cites W2076892268 @default.
• W2068950617 cites W2079781653 @default.
• W2068950617 cites W2081502626 @default.
• W2068950617 cites W2088726195 @default.
• W2068950617 cites W2089959459 @default.
• W2068950617 cites W2090533250 @default.
• W2068950617 cites W2090677329 @default.
• W2068950617 cites W2098394909 @default.
• W2068950617 cites W2103538456 @default.
• W2068950617 cites W2103675893 @default.
• W2068950617 cites W2104352274 @default.
• W2068950617 cites W2109856143 @default.
• W2068950617 cites W2121529170 @default.
• W2068950617 cites W2121894190 @default.
• W2068950617 cites W2122384102 @default.
• W2068950617 cites W2123852543 @default.
• W2068950617 cites W2126702442 @default.
• W2068950617 cites W2129783221 @default.
• W2068950617 cites W2137083135 @default.
• W2068950617 cites W2137775428 @default.
• W2068950617 cites W2143326274 @default.
• W2068950617 cites W2144419372 @default.
• W2068950617 cites W2144762224 @default.
• W2068950617 cites W2155061619 @default.
• W2068950617 cites W2158859599 @default.
• W2068950617 cites W2161493414 @default.
• W2068950617 cites W2166087016 @default.
• W2068950617 cites W2170164714 @default.
• W2068950617 cites W2173535981 @default.
• W2068950617 cites W2173867321 @default.
• W2068950617 cites W2225125258 @default.
• W2068950617 cites W2314816946 @default.
• W2068950617 cites W2314993465 @default.

• next