Opetiosaurus

Opetiosaurus; Temporal range: Cenomanian, 99.7–94.3 Ma PreꞒ Ꞓ O S D C P T J K Pg N
	Photograph (left) and interpretive drawing (right) of O. bucchichi holotype (BSP 1901/002/0001-0005)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Squamata
Clade:	†Mosasauria
Family:	†Aigialosauridae
Genus:	†Opetiosaurus; Kornhuber, 1901
Species:	†O. bucchichi
Binomial name
	†Opetiosaurus bucchichi; Kornhuber, 1901

Opetiosaurus is an extinct genus of Late Cretaceous marine or semiaquatic lizard classified as part of the family Aigialosauridae within the Mosasauroidea. Exclusively found in deposits of Cenomanian age near Hvar, Croatia, the genus contain one valid species, O. bucchichi. It was a small reptile measuring 1 metre (3.3 ft) long.^[1]

The genus was diagnosed as congenetic with Aigialosaurus by Dutchak and Caldwell (2009),^[2] being re-diagnosed as "Aigialosaurus bucchichi" and only separated by some minor anatomical differences between specimens of the two species. Madzia & Cau (2017)^[3] show that the two species are not necessarily more closely related to each other than either is to more derived mosasauroids, suggesting not only that Opetiosaurus is a valid genus, but also calling the validity of the Aigialosauridae as a monophyletic group into question.

References

^ Bardet, Nathalie (2008). "The Cenomanian-Turonian (late Cretaceous) radiation of marine squamates (Reptilia): the role of the Mediterranean Tethys". Bulletin de la Société Géologique de France. 179 (6): 605–623. doi:10.2113/gssgfbull.179.6.605.
^ Dutchak, Alex R.; and Caldwell, Michael W. (2009)."A redescription of Aigialosaurus (= Opetiosaurus) bucchichi (Kornhuber, 1901) (Squamata: Aigialosauridae) with comments on mosasauroid systematics". Journal of Vertebrate Paleontology 29 (2): 437-452.
^ Madzia, D., Cau, A. (2017). Inferring "weak spots" in phylogenetic trees: application to mosasauroid nomenclature. PeerJ 5:e3782

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[1] Bardet, Nathalie (2008). "The Cenomanian-Turonian (late Cretaceous) radiation of marine squamates (Reptilia): the role of the Mediterranean Tethys". Bulletin de la Société Géologique de France. 179 (6): 605–623. doi:10.2113/gssgfbull.179.6.605.

[DC09-2] Dutchak, Alex R.; and Caldwell, Michael W. (2009)."A redescription of Aigialosaurus (= Opetiosaurus) bucchichi (Kornhuber, 1901) (Squamata: Aigialosauridae) with comments on mosasauroid systematics". Journal of Vertebrate Paleontology 29 (2): 437-452.

[:02-3] Madzia, D., Cau, A. (2017). Inferring "weak spots" in phylogenetic trees: application to mosasauroid nomenclature. PeerJ 5:e3782

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