''Proexochokefalos'' (meaning "big head with big tuberosities") is an extinct genus of machimosaurid

teleosauroid Teleosauroidea is an extinct superfamily of thalattosuchian crocodyliforms living from the Early Jurassic to the Early Cretaceous. It is phylogenetically defined by Mark T. Young and colleagues in 2024 in the ''PhyloCode'' as "the largest clade w ...

from the Jurassic of France

Classification

The type species, ''S. heberti'', was originally named "''Steneosaurus''" ''heberti'' by Morel de Glasville in 1876 from a complete skull and mandible (MNHN.F ) found in the

Callovian In the geologic timescale, the Callovian is an age and stage in the Middle Jurassic, lasting between 165.3 ± 1.1 Ma (million years ago) and 161.5 ± 1.0 Ma. It is the last stage of the Middle Jurassic, following the Bathonian and preceding the ...

aged

Marnes de Dives The Marnes de Dives is a geological formation in Normandy, France. It dates back to the upper part of the Callovian stage of the Middle Jurassic.Weishampel, David B; et al. (2004). "Dinosaur distribution (Middle Jurassic, Europe)." In: Weishampel ...

near

Villers-sur-mer Villers-sur-Mer () is a commune in the Calvados department in Normandy, northwestern France, with a population of 2,644 as of 2017. Geography The commune is located on the French coast of the English Channel, on the Côte Fleurie, between ...

in the

Calvados department Calvados (, , ) is a department in the Normandy region in northwestern France. It takes its name from a cluster of rocks off the Normandy coast. In 2019, it had a population of 694,905.Normandy Normandy (; or ) is a geographical and cultural region in northwestern Europe, roughly coextensive with the historical Duchy of Normandy. Normandy comprises Normandy (administrative region), mainland Normandy (a part of France) and insular N ...

, France.Brignon A. 2018. La découverte du ''Steneosaurus heberti'' Morel de Glasville 1876 dans le Jurassique des Vaches Noires. Fossiles, revue française de Paléontologie, 36:40-46 ''Steneosaurus depressus'' is a junior synonym. Another species referred to the genus, ''Proexochokefalos'' cf. ''bouchardi'' is known from remains from the

Calcaire de Caen The Calcaire de Caen or Calcaires de Caen Formation; French language, French for Caen Limestone, is a geological Formation (geology), formation in France. It dates back to the mid-Bathonian of the Jurassic period.Weishampel, David B; et al. (2004) ...

, France, and

Reuchenette Formation The Reuchenette Formation is a Jurassic geologic formation in Switzerland. It is Kimmeridgian in age and predominantly consists of well stratified limestone, with lithology variable both laterally and stratigraphically including wackestones, pac ...

, Switzerland.

References

{{Taxonbar, from=Q90545440 Thalattosuchia Callovian life Oxfordian life Kimmeridgian life Late Jurassic reptiles of Europe Middle Jurassic reptiles of Europe Jurassic France Fossils of France Jurassic Switzerland Fossils of Switzerland Fossil taxa described in 2020 Prehistoric pseudosuchian genera