Protognathosaurus

Protognathosaurus; Temporal range: Middle Jurassic, 168.2–161.5 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Clade:	Saurischia
Clade:	†Sauropodomorpha
Clade:	†Sauropoda
Genus:	†Protognathosaurus; Olshevsky, 1991
Species:	†P. oxyodon
Binomial name
	†Protognathosaurus oxyodon; Zhang, 1988
Synonyms
	Protognathus oxyodon Zhang, 1988;

Protognathosaurus (meaning "early jaw lizard") is a genus of herbivorous dinosaur from the Middle Jurassic. It was a sauropod found at Dashanpu in Sichuan in what is present-day China.

In 1988 Zhang Yihun named and described the type species Protognathus oxyodon.^[1] The generic name was derived from Greek πρῶτος, protos, "first", and γνάθος, gnathos, "jaw". The specific name is derived from Greek ὀξύς, oxys, "sharp", and ὀδών, odon, "tooth". However, the generic name was preoccupied, already in use, by a genus of carabid beetle, Protognathus (Basilewsky, 1950^[2]) which is considered a synonym of Pseudognathaphanus (Schauberger, 1932).^[3] The species was therefore renamed into the combinatio nova Protognathosaurus oxyodon by George Olshevsky in 1991.^[4]

Protognathosaurus is known only from a fragmentary lower jaw, holotype CV 00732 (= ChM V732) found in a layer of the Shaximiao Formation dating from the Bathonian-Callovian. The fragment consists of the front left dentary and shows eighteen tooth positions, some still containing sharp replacement teeth, after which the genus was named. Most researchers consider Protognathosaurus to be a nomen dubium.

References

^ Zhang, Y., 1988, The Middle Jurassic Dinosaur Fauna from Dashanpu, Zigong, Sichuan. Vol. II. Sauropod Dinosaurs (I), Sichuan Publishing House of Science and Technology, Chengdu, China, 89 pp
^ Basilewsky, P. (1950b) Nouveaux Cossyphodides du Congo belge (Col. Cossyphodidae). Revue de Zoologie et de Botanique Africaines, 43, 240–243.
^ Kataev, Boris; Wrase, David (2016-10-01). "A new species of the genus Pseudognathaphanus from Nepal, with a short review of the Oriental species (Coleoptera, Carabidae, Harpalini)". Entomologische Blätter und Coleoptera. 112: 223–236.
^ Olshevsky, G., 1991, A Revision of the Parainfraclass Archosauria Cope, 1869, Excluding the Advanced Crocodylia. Mesozoic Meanderings 2, iv + 196 pp