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Reptiles Guide

Mosasaurs

Halisaurinae | Plioplatecarpinae | Tylosaurinae

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Mosasaurinae
Conservation status: Fossil
An early etching of a mosasaur.
 
An early etching of a mosasaur.
Scientific classification
Kingdom: Animalia
 
Phylum: Chordata
 
Class: Sauropsida
 
Order: Squamata
 
Family: Mosasauridae
 
Subfamily: Mosasaurinae
 

Mosasaurinae (Gervais, 1853; Williston, 1897) is a subfamily of mosasaurs, a diverse group of Late Cretaceous marine squamates.

Russell (1967, pp. 123-124) defined the Mosasurinae as differing from all other mosasaurs as follows: "Small rostrum present or absent anterior to premaxillary teeth. Fourteen or more teeth present in dentary and maxilla. Cranial nerves X, XI, and XII leave lateral wall of opisthotic through two foramina. No canal or groove in floor of basioccipital or basisphenoid for basilar artery. Suprastapedial process of quadrate distally expanded. Dorsal edge of surangular thin lamina of bone rising anteriorly to posterior surface of coronoid...At least 31, usually 42-45 presacral vertebrae present. Length of presacral series exceeds that of postsacral, neural spines of posterior caudal vertebrae elongated to form distinct fin. Appendicular elements with smoothly finished articular surfaces, tarsus and carpus well ossified." In his 1997 revision of the phylogeny of the Mosasauroidea, Bell (pp. 293-332) retained the Mosasaurinae as a clade, though he reassigned Russell's tribe Prognathodontini to the Mosasaurinae and recognized a new tribe of mosasaurines, the Globidensini.

Clidastes liodontus pursuing a toxocheylid turtle

Genera referrable to the Mosasaurinae ("mosasaurines") have been found on all continents except Australia and South America. The lineage first appears in the Turonian and thrived until the mass extinction event at the end of the Maastrichtian. They ranged in size from one of the smallest known mosasaurs (Carinodens, 3-3.5 meters), to medium-sized taxa (Clidastes, 6+ meters), to the largest of the mosasaurs (Mosasaurus hoffamanni) reaching lengths in excess of 13 meters. Many genera of mosasaurines were either piscivorous or generalists, preying on fish and other marine reptiles, but one lineage, the Globidensini evolved specialized crushing teeth, adapting to a diet of ammonites and/or marine turtles.

Species and Taxonomy

  • Subfamily Mosasaurinae
    • Mosasaurini (Russell, 1967)
      • Clidastes (paraphyletic)
        • C. liodontus
        • C. "moorevilensis" (nomen nudum)
        • C. propython
      • Mosasaurus (paraphyletic)
        • M. hoffmanni (=M. maximus)
        • M. conodon
        • M. dekayi
        • M. missouriensis
        • M. mokoroa
      • Moanasaurus
        • M. mangahouangae
      • Amphekepubis
        • A. johnsoni
      • Liodon (polyphyletic)
        • L. anceps
        • L. sectorius
        • L. mosasauroides
    • Plotosaurini (Russell, 1967)
      • Plotosaurus
        • P. tuckeri
        • P. bennisoni
    • Globidensini (Bell, 1997)
      • Globidens
        • G. alabamaensis
        • G. dakotensis
      • Prognathodon
        • P. overtoni
        • P. giganteus
        • P. rapax
        • P. waiparaensis
        • P. stadtmani
        • P. solvayi
      • Plesiotylosaurus
        • P. crassidens
  • Mosasaurinae incertae sedis
    • Carinodens
      • C. belgicus
    • Goronyosaurus
      • G. nigeriensis
    • Pluridens
      • P. walkeri

References

  • Bell, G. L. Jr., 1997. A phylogenetic revision of North American and Adriatic Mosasauroidea. pp. 293-332 In Callaway J. M. and E. L Nicholls, (eds.), Ancient Marine Reptiles, Academic Press, 501 pp.
  • Gervais, P. 1853. Observations relatives aux reptiles fossiles de France. Acad. Sci. Paris Compt. Rendus 36:374-377, 470-474.
  • Kiernan, C. R., 2002. Stratigraphic distribution and habitat segregation of mosasaurs in the Upper Cretaceous of western and central Alabama, with an historical review of Alabama mosasaur discoveries. Journal of Vertebrate Paleontology 22(1):91-103.
  • Russell, D. A., 1967. Systematics and morphology of American mosasaurs. Peabody Museum of Natural History, Yale University, Bulletin 23.
  • Williston, S. W. 1897. Range and distribution of the mosasaurs with remarks on synonymy. Kansas University Quarterly 4(4):177-185.

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