Hydrorion brachypterygius GROßMANN 2006
Genus
Diagnosis GROßMANN 2006
Moderately sized plesiosauroid, adults with an overall length of up to 3.0 m and a skull-length of approximately 180 to 200 mm, snout rounded and constricted, with elongated sculpturing, temporal openings larger than orbits; small teeth at the premaxillary-maxillary suture and four to five larger teeth in the maxilla and premaxilla near the premaxillary-maxillary suture; parietal foramen situated at the parietal-frontal suture, no jugal-orbit contact, no postorbital-parietal contact, squamosal with a lateral process extending ventrally; vomeronasal opening present, anterior interpterygoid vacuity absent, pterygoids meet in a dorsal median suture ventral to the basis cranii; 29 to 36 elongated cervical vertebrae, two to three sacral vertebrae, four proximal propodials in adults, maximum number of phalanges more than ten in the third finger, rather short limbs of approximately 20 per cent of the overall length in adults.
Specimens
| Staatliches Museum für Naturkunde Stuttgart | |
| MB.R.1991 | A complete adult specimen in right lateral view. |
| Staatliches Museum für Naturkunde, Karlsruhe | |
| SMNS 51141 | A nearly complete juvenile specimen in dorsal view. |
| SMNS 51143 | A nearly complete adult specimen exposed in ventral view |
| Universität Tübingen | |
| GPIT/RE/3185 | Complete specimen, mostly exposed in dorsal view, with the right lateral side of the vertebral column visible. |
| Urwelt-Museum Hauff | |
| Hauff Nr. 8 | complete skeleton |