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Ogmodirus; Temporal range: Late Cretaceous, 94.3–89.3 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
	Paddle bone of KUVP 441
	Cervical series of KUVP 441
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Sauropsida
Order:	†Plesiosauria
Suborder:	†Plesiosauroidea
Family:	†Elasmosauridae?
Genus:	†Ogmodirus; Williston and Moodie, 1913
Binomial name
	†Ogmodirus martini; Williston & Moodie, 1913
Synonyms
	Ogmodirus martinii Moodie, 1916;

Ogmodirus is an extinct genus of plesiosaur found in the Cenomanian-Turonian (Late Cretaceous) Greenhorn Limestone of Kansas.^[1]^[2] The type species, O. martini, was named by Samuel Wendell Williston and Roy Lee Moodie in 1913.^[2]

Discovery and naming

The holotype, KUVP 441, consists of a pelvic girdle, limb elements, and more than fifty cervical (neck) vertebrae from a juvenile discovered in Cloud County, Kansas by C. Boyce in 1909.^[2] KUVP 441 was named as Ogmodirus martini by Williston & Moodie (1913)^[2] and the specific name was emended to martinii by Moodie (1916), but the original name takes precedence.^[3] The holotype was described in detail by Williston & Moodie (1917).^[3]

A second species, Ogmodirus ischiadicus (based on specimen KUVP 434), was initially placed within its own genus, Thalassiosaurus,^[3] and has since been referred to Styxosaurus.^[4] It was placed in Ogmodirus by Williston & Moodie (1917).^[3]

Classification

According to Welles (1962),^[5] Ogmodirus martini may be member of the Elasmosauridae, a group of marine animals related to Elasmosaurus, but the condition of the fossils discovered to date means the genus is dubious beyond Plesiosauria. Sepkoski (2002) assigned Ogmodirus to the Plesiosauria.^[6]

References

^ Ogmodirus martini from Oceans of Kansas
^ ^a ^b ^c ^d Williston, S. W. and Moodie, R. L. (1913). New plesiosaurian genus from the Cretaceous of Nebraska. Bulletin of the Geological Society of America 24: 120-121.
^ ^a ^b ^c ^d S. W. Williston and R. L. Moodie. (1917). Ogmodirus martinii, a new plesiosaur from the Cretaceous of Wyoming. The University of Kansas Science Bulletin 10(2):61-73
^ S. W. Williston. (1903). North American plesiosaurs, part 1. Geological Series Field Museum of Natural History 3(1):1-77
^ S. P. Welles. (1962). A new species of elasmosaur from the Aptian of Colombia and a review of the Cretaceous plesiosaurs. University of California Publications in Geological Sciences 44(1):1-96
^ Sepkoski, J.J. (2002). A compendium of fossil marine animal genera. Bulletins of American Paleontology 363:1-560.