Geodiversitas est indexé dans / Geodiversitas is indexed in:-Science Citation Index Expanded (SciSearch ® ) -ISI Alerting Services ® -Current Contents ® / Physical, Chemical, and Earth Sciences® -Scopus ® Geodiversitas est distribué en version électronique par / Geodiversitas is distributed electronically by: -BioOne ® (http://www.bioone.org) Les articles ainsi que les nouveautés nomenclaturales publiés dans Geodiversitas sont référencés par / Articles and nomenclatural novelties published in Geodiversitas are referenced by: -ZooBank ® (http://zoobank.org) GEODIVERSITAS • 2022 • 44 (25) © Publications scientifiques du Muséum national d'Histoire naturelle, Paris.

The large pycnodontiform fish genus Cosmodus Sauvage, 1879 is redescribed on the basis of both historical material and new specimens, and a formal diagnosis is proposed. The vomerine and prearticular dentitions of Cosmodus show a unique combination of characters, including the morphology and ornamentation of the tooth crowns and the number of tooth rows. Cosmodus is thus recognized as a valid distinct genus, restricted to the middle-upper Cenomanian of Western Europe (France, England, Spain, and possibly Germany) and including a single species, C. carentonensis (Coquand, 1859). Cosmodus shares some peculiar