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• W2174045327 endingPage "136" @default.
• W2174045327 startingPage "1" @default.
• W2174045327 abstract "Freshwater stingrays from the Fossil Butte Member of the late early Eocene Green River Formation of Wyoming are reviewed, and a new genus and species of fossil stingray is described. †Asterotrygon maloneyi, n.gen., n.sp. is remarkably well preserved and is known from articulated skeletons of juveniles and adults, both males and females. It is distinguished from all Recent and fossil stingrays, including †Heliobatis radians from the same formation, by the unique presence of a dorsal fin covered with dermal denticles directly anterior to the caudal stings. Other characters that in combination distinguish the new fossil genus from all other stingrays include: retention of separate, individual vertebrae extending to the tail extremity instead of a cartilaginous rod posterior to caudal stings; dorsal surface of disc and tail covered by numerous, closely packed, minute denticles; tail relatively stout at base; and relative proportions of disc and tail. †Asterotrygon, n.gen. shares with certain stingray genera postorbital processes of neurocranium separated from a supraorbital process by a small notch in the supraorbital shelf, presence of both dorsal and ventral tail-folds posterior to caudal stings (and internally supported by rudimentary radial elements), and hyomandibulae separated from lower jaws by a gap that originally contained the hyomandibular-Meckelian ligament. A calcified angular cartilage between the hyomandibula and Meckel's cartilage is tentatively identified in †Asterotrygon, n.gen. as well. †Asterotrygon, n.gen. is unquestionably a stingray, presenting many myliobatiform synapomorphies including caudal stings on the dorsal aspect of tail, lack of jugal arches in neurocranium, a thoracolumbar synarcual cartilage posterior to scapulocoracoid, absence of thoracic ribs, and laterally expanded, shelflike postorbital processes. †Asterotrygon, n.gen. and †Heliobatis primitively retain a narrow and slightly arched puboischiadic girdle and primitively lack calcified rostral elements in adults.A phylogenetic analysis of 23 stingray genera, two outgroups, and 44 informative morphological characters resulted in 35 equally most parsimonious trees. The strict consensus reveals the following hierarchical structure: Hexatrygon (†Asterotrygon, n.gen., Plesiobatis, Urolophidae (Urotrygonidae (†Heliobatis (Potamotrygonidae (amphi-American Himantura, Pteroplatytrygon, Himantura, Taeniura, Dasyatis (Gymnuridae Myliobatidae)))))). Our resulting tree has nodes in common with previous phylogenetic analyses of stingrays (e.g., Hexatrygon is the most basal stingray genus; gymnurids and myliobatids [pelagic stingrays] are well-supported sister-groups), but includes novel components, such as a clade that includes all dasyatid genera (as a polytomy) and the component Gymnuridae Myliobatidae. “Dasyatidae” is not monophyletic in any of the minimum-length trees obtained; Urolophidae (Urolophus and Trygonoptera) and Urotrygonidae (Urobatis and Urotrygon) are both monophyletic, but are not sister-groups. †Asterotrygon, n.gen. forms a clade with urolophids in 21 of the 35 equally most parsimonious trees. Successive approximations weighting adds only one additional node in relation to the strict consensus, which unites Pteroplatytrygon, Dasyatis, and Himantura sensu stricto (in a polytomy) with Gymnuridae Myliobatidae. The resulting stingray phylogeny is at odds with previous phylogenies mostly regarding the affinities of amphi-American Himantura and Taeniura, which do not form a monophyletic group with the South American freshwater stingrays (Potamotrygonidae) in any of the minimum-length trees obtained. Similar to most elasmobranch groups, stingrays display much character conflict, and cladogram topologies are very sensitive to changes in character coding. Due to a high degree of character variation present in certain generic-level terminal taxa, a more fully representative species-level phylogeny is necessary to clarify the system" @default.
• W2174045327 created "2016-06-24" @default.
• W2174045327 creator A5002451924 @default.
• W2174045327 creator A5026271013 @default.
• W2174045327 creator A5031495388 @default.
• W2174045327 date "2004-06-01" @default.
• W2174045327 modified "2023-09-27" @default.
• W2174045327 title "FRESHWATER STINGRAYS OF THE GREEN RIVER FORMATION OF WYOMING (EARLY EOCENE), WITH THE DESCRIPTION OF A NEW GENUS AND SPECIES AND AN ANALYSIS OF ITS PHYLOGENETIC RELATIONSHIPS (CHONDRICHTHYES: MYLIOBATIFORMES)" @default.
• W2174045327 cites W1529099308 @default.
• W2174045327 cites W1964786337 @default.
• W2174045327 cites W1965247367 @default.
• W2174045327 cites W1965383890 @default.
• W2174045327 cites W1967387050 @default.
• W2174045327 cites W1969154557 @default.
• W2174045327 cites W1971978719 @default.
• W2174045327 cites W1973344389 @default.
• W2174045327 cites W1976918442 @default.
• W2174045327 cites W1978203077 @default.
• W2174045327 cites W1978557909 @default.
• W2174045327 cites W1982861576 @default.
• W2174045327 cites W1984895732 @default.
• W2174045327 cites W1985301186 @default.
• W2174045327 cites W1989105446 @default.
• W2174045327 cites W1997782777 @default.
• W2174045327 cites W1998341675 @default.
• W2174045327 cites W1998970180 @default.
• W2174045327 cites W2001295835 @default.
• W2174045327 cites W2002678450 @default.
• W2174045327 cites W2005338778 @default.
• W2174045327 cites W2006007378 @default.
• W2174045327 cites W2008668441 @default.
• W2174045327 cites W2009073783 @default.
• W2174045327 cites W2011454861 @default.
• W2174045327 cites W2012841587 @default.
• W2174045327 cites W2017348801 @default.
• W2174045327 cites W2020056174 @default.
• W2174045327 cites W2020075499 @default.
• W2174045327 cites W2026592489 @default.
• W2174045327 cites W2030338848 @default.
• W2174045327 cites W2030456104 @default.
• W2174045327 cites W2035622691 @default.
• W2174045327 cites W2040018878 @default.
• W2174045327 cites W2041152753 @default.
• W2174045327 cites W2042617011 @default.
• W2174045327 cites W2048399017 @default.
• W2174045327 cites W2052739137 @default.
• W2174045327 cites W2052952706 @default.
• W2174045327 cites W2060957868 @default.
• W2174045327 cites W2067667580 @default.
• W2174045327 cites W2070839048 @default.
• W2174045327 cites W2073156307 @default.
• W2174045327 cites W2074417223 @default.
• W2174045327 cites W2086069253 @default.
• W2174045327 cites W2088812027 @default.
• W2174045327 cites W2090985529 @default.
• W2174045327 cites W2099445225 @default.
• W2174045327 cites W2107584607 @default.
• W2174045327 cites W2113575423 @default.
• W2174045327 cites W2119033868 @default.
• W2174045327 cites W2129973196 @default.
• W2174045327 cites W2133321786 @default.
• W2174045327 cites W2144647861 @default.
• W2174045327 cites W2150241189 @default.
• W2174045327 cites W2154597917 @default.
• W2174045327 cites W2160382543 @default.
• W2174045327 cites W2162336251 @default.
• W2174045327 cites W2165350687 @default.
• W2174045327 cites W2171422335 @default.
• W2174045327 cites W2177100732 @default.
• W2174045327 cites W2188023334 @default.
• W2174045327 cites W2306526599 @default.
• W2174045327 cites W2317752827 @default.
• W2174045327 cites W2320655927 @default.
• W2174045327 cites W2321478524 @default.
• W2174045327 cites W2335673157 @default.
• W2174045327 cites W2409293878 @default.
• W2174045327 cites W2414294775 @default.
• W2174045327 cites W2441811850 @default.
• W2174045327 cites W2499666961 @default.
• W2174045327 cites W2751918990 @default.
• W2174045327 cites W28057539 @default.
• W2174045327 cites W2918817120 @default.
• W2174045327 cites W2984824684 @default.
• W2174045327 cites W3203620125 @default.
• W2174045327 cites W40765797 @default.
• W2174045327 cites W4211150197 @default.
• W2174045327 cites W4214720648 @default.
• W2174045327 cites W4233215150 @default.
• W2174045327 cites W4235903931 @default.
• W2174045327 cites W4237855353 @default.
• W2174045327 cites W4238403854 @default.
• W2174045327 cites W4240368232 @default.
• W2174045327 cites W4240882662 @default.
• W2174045327 cites W4242049611 @default.
• W2174045327 cites W4250059400 @default.
• W2174045327 cites W4253681343 @default.
• W2174045327 doi "https://doi.org/10.1206/0003-0090(2004)284<0001:fsotgr>2.0.co;2" @default.
• W2174045327 hasPublicationYear "2004" @default.

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