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Trinacromerum bentonianum

Reptilia - Sauropterygia - Polycotylidae

Taxonomy
Trinacromerum bentonianum was named by Cragin (1888). Its type specimen is USNM 10945 and is not a trace fossil. Its type locality is near Downs (USNM), which is in a Turonian marine limestone in the Carlile Shale Formation of Kansas.

It was considered a nomen vanum by Welles (1962).

Synonyms
Synonymy list
YearName and author
1888Trinacromerum bentonianum Cragin
1903Trinacromerum anonymum Williston
1903Trinacromerum bentonianum Williston p. 11
1903Trinacromerum anonymum Williston p. 66 figs. pl. 28
1908Trinacromerum bentonianum Williston p. 716
1908Trinacromerum anonymum Williston p. 729
1944Trinacromerum willistoni Riggs p. 78 figs. 1-8
1962Dolichorhynchops willistoni Junk
1962Dolichorhynchops willistoni Welles p. 50
1968Ceraunosaurus brownorum Blank
1968Ceraunosaurus brownorum Thurmond p. 1290
1996Trinacromerum bentonianum Carpenter p. 279 figs. 3, 5, 13-17
1997Trinacromerum anonymum Adams p. 182
1997Trinacromerum bentonianum Adams p. 182
1997Trinacromerum brownorum Adams p. 182
2001Trinacromerum bentonianum O'Keefe p. 17
2004Trinacromerum bentonianum O'Keefe p. 336 figs. Fig. 11
2007Trinacromerum bentonianum Albright et al. p. 52 fig. 14

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
RankNameAuthor
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
orderSauropterygia
Pistosauria(Baur 1890)
Plesiosauria(de Blainville 1835)
superfamilyPlesiosauroideaWelles 1943
Cryptoclidia
Xenopsaria
Leptocleidia
familyPolycotylidaeWilliston 1908
genusTrinacromerumCragin 1888
speciesbentonianumCragin 1888

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.

Diagnosis
ReferenceDiagnosis
E. S. Riggs 1944 (Trinacromerum willistoni)Related to Trinocromerum osborni, but differing in having the premaxillaries extending farther back; in having a larger maxillary tooth series (at least 34 as compared to a possible 26), interclavicle relatively much larger, and lacking the large foramen.
K. Carpenter 1996Differs from Trinacromerum kirki in the lack of a posterior extension on the coracoid, straight ilium, and less elongated ischium.