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Plesiotylosaurus crassidens

Reptilia - Mosasauridae

Taxonomy
Plesiotylosaurus crassidens was named by Camp (1942). Its type specimen is LACM 2759 and is a 3D body fossil. Its type locality is LACM (CIT) 328, which is in a Maastrichtian marine shale in the Moreno Formation of California.

Synonymy list
YearName and author
1942Plesiotylosaurus crassidens Camp p. 05 figs. 11 - 13
1967Plesiotylosaurus crassidens Russell p. 168
2009Plesiotylosaurus crassidens Lindgren figs. 2-6
2014Plesiotylosaurus crassidens Fanti et al.
2019Plesiotylosaurus crassidens Driscoll et al.

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
RankNameAuthor
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
—Sauropsida
classReptilia
—Squamata()
familyMosasauridae
subfamilyMosasaurinaeGervais 1853
genusPlesiotylosaurus
speciescrassidens

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.

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Diagnosis
ReferenceDiagnosis
C. L. Camp 1942Like Tylosaurus, but without extended rostrum, with larger pterygoid teeth, expanded prefrontals and shorter, stouter quadrate.
J. Lindgren 2009"Skull large and elongate but with relatively short postpineal segment. Conical predental rostrum in front of first pair of premaxillary teeth. Anterior portion of internarial bar wide and subrectangular. Marginal tooth crowns labiolingually flattened and covered with faintly faceted and finely crenulated enamel. Frontal invaded by posterior end of external nares. Prefrontal forms large portion of posterolateral border of naris. Supraorbital wing of prefrontal triangular and broadly overlapped ventrally by postorbitofrontal. Prefrontal-postorbitofrontal contact distal to lateral edge of frontal. Dorsal surface of postorbitofrontal wide. Parietal foramen small and located close to fronto-parietal suture. Parietal table transversely narrow. Sagittal ramus of parietal hour-glass-shaped in dorsal view. Anteriorly situated pterygoid teeth approaching marginal teeth in size. Quadrate with fused suprastapedial and infrastapedial processes. Distinct projection of dentary anterior to first dentary tooth. Coronoid concave above, posterior wing with medial C-shaped excavation. Deep longitudinal sulcus on medial face of surangular. Cervicals with reniform central articulations and prominent zygosphenes and zygantra.

Dental formula: 4 teeth in premaxilla, 12–13 teeth in maxilla, 16 teeth in dentary, and, at least, 8 teeth in pterygoid."