Eonatator STERNBERGII (WIMAN 1920
Description
EONATATOR STERNBERGII (WIMAN, 1920) COMB. NOV.
Holotype: UPI R 163, a nearly complete skeleton described by Wiman (1920).
Type locality and horizon: Smoky Hill Member, Niobrara Chalk, Santonian (Late Cretaceous), Kansas (USA).
Referred specimen: USNM 3777, incomplete skeleton, Smoky Hill Member, Niobrara Chalk, Santonian (Late Cretaceous), Beaver Creek, Logan County, Kansas (USA) (Russell, 1967: 126).
Emended diagnosis: Ambiguous characters: premaxilla–maxilla lateral suture ending posterior to the 9th maxillary teeth; tail about 40% of the head and trunk length (convergent in mosasaurines); caudal vertebra length greater than width; fewer than four pygal vertebrae; femur length about twice distal width (convergent in Clidastes). Autapomorphies: parietal with smooth triangular table extending very far posteriorly, bearing medium-sized circular foramen, located at distance twice its diameter from the frontal–parietal suture, and surrounded anteriorly and posteriorly by two parallel ridges; rounded quadrate with regularly convex tympanic ala; vertebral formula: seven cervicals, 24 dorsals, four pygals, 28 median caudals and at least 41 terminal caudals; humerus length approximately 2.5¥ distal width.
Notes
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Linked records
Additional details
Identifiers
Biodiversity
- Collection code
- UPI , USNM
- Family
- Mosasauridae
- Genus
- Eonatator
- Kingdom
- Animalia
- Material sample ID
- R 163 , USNM 3777
- Order
- Squamata
- Phylum
- Chordata
- Scientific name authorship
- STERNBERGII (WIMAN
- Taxon rank
- genus
- Type status
- holotype
- Taxonomic concept label
- Eonatator (WIMAN, 1920 sec. Bardet, Suberbiola, Iarochene, Bouya & Amaghzaz, 2005
References
- Wiman C. 1920. Some reptiles from the Niobrara Group in Kansas. Bulletin of the Geological Institute from Uppsala 18: 9 - 18.
- Russell DA. 1967. Systematics and morphology of American mosasaurs. Bulletin of the Peabody Museum of Natural History 23: 1 - 240.