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Dolichorhynchops osborni
Taxonomy
Dolichorhynchops osborni was named by Williston (1902). Its type specimen is KUVP 1300, a skeleton (nearly complete skeleton), and it is a 3D body fossil. Its type locality is east of Wallace (PROXY), which is in a Santonian marine chalk in the Niobrara Formation of Kansas.
It was recombined as Trinacromerum osborni by Williston (1906), Blank (1910), Hay (1930) and Adams (1997).
It was recombined as Trinacromerum osborni by Williston (1906), Blank (1910), Hay (1930) and Adams (1997).
Synonyms
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Synonymy list
Year | Name and author |
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1902 | Dolichorhynchops osborni Williston p. 244 |
1903 | Dolichorhynchops osborni Williston p. 12 |
1906 | Trinacromerum osborni Williston p. 234 |
1910 | Trinacromerum osborni Blank |
1930 | Trinacromerum osborni Hay p. 117 |
1951 | Polycotylus osborni Watson |
1962 | Dolichorhynchops osborni Welles pp. 3 & 62 |
1996 | Dolichorhynchops osborni Carpenter pp. 270-271 figs. 3, 5-10, 12 |
1997 | Trinacromerum osborni Adams p. 182 |
1997 | Dolichorhynchops osborni Carpenter p. 215 |
1999 | Dolichorhynchops osborni Storrs pp. 9-10 |
2001 | Dolichorhynchops osborni O'Keefe p. 17 |
2004 | Dolichorhynchops osborni O'Keefe p. 336 figs. Fig. 11 |
2008 | Dolichorhynchops osborni O'Keefe p. 665 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Dolichorhynchops osborni Williston 1902
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Invalid names: Polycotylus osborni Watson 1951 [synonym]
Diagnosis
Reference | Diagnosis | |
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K. Carpenter 1996 | Teeth long and slender, with fine striae confined to lower two-thirds,whereas teeth robust in Polycotylus latipinnis and Trinacrmerum bentonianum; temporal fenestra short and wide, but long and narrow in T. bentonianum; suspensorium vertical, inclined posteriorly in T. bentonianum; pterygoid plates do not extend as far posteriorly beyong the posterior interpterygoid fenestra as in T. bentonianum; pterygoid processes of quadrate shorter than in T bentonianum; 46 vertebrae (19 cervicals, 3 pectorals, 23-24 dorsals), versus 54 presacral vertebrae (26 cervicals, 3 pectorals, 25 dorsals) in P. latipinnis and 46 vertebrae (20 cervical, 3 pectorals, 23 dorsals) in T. bentonianum; chevrons borne on posterior of caudal centrum but shared between adjacent caudals in P. latipinnis; ilium straight in T. bentonianum, whereas it curves posteriorly in P. latipinnis. | |
F. R. O'Keefe 2008 | Relatively small polycotylid plesiosaur possessing the following unique combination of characters: angulars reach into symphysis but to not meet anterior to splenials; tooth crowns small and long relative to height; pineal foramen present; lateral plates of pterygoids wide with round lateral margins, ectopterygoid not carried on distinct pterygoid process, parasphenoid has well-developed anterior process projecting into anterior interpterygoid vacuity; anterior interpterygoid vacuity extends anteriorly between internal nares; dorsal vertebral centra not compressed; humerus sigmoid but long and gracile, with poorly defined facets for supernumerary ossifications; ilium with pointed proximal end, pubis possesses distinct lateral process |