Quasicolognathus eothen Sues, Kligman & Schoch, 2022

Sues, Hans-Dieter & Schoch, Rainer R., 2025, Synopsis of the Triassic reptiles from Germany, Fossil Record 28 (2), pp. 411-483 : 411-483

Quasicolognathus eothen Sues, Kligman & Schoch, 2022

Holotype.

SMNS 97019 , cranial fragment comprising incomplete left maxilla with three teeth, left prefrontal, and mass of crushed bone possibly including palatine (Fig. 10 D ).

Type locality.

Schumann Quarry, Eschenau, Vellberg municipality, Schwäbisch Hall district, Baden-Württemberg.

Type horizon.

Untere Graue Mergel, Bed E 6, Erfurt Formation, Lower Keuper Subgroup. Age: Middle Triassic (Ladinian: Longobardian).

Referred material.

SMNS 91315 , SMNS 91428 , SMNS 91429 , incomplete right dentaries, each with two teeth.

Diagnosis.

Distinguished by the following combination of features: Maxilla with tall, nearly vertical dorsal process; two or three in labial / lingual view more or less triangular teeth in each maxilla and dentary; tooth crowns tapering toward apex, with distal ‘ bulge’ near base and mesial portion slightly overlapping preceding crown mesiolingually; long axes of tooth crowns aligned mesiolingually; and enamel of apical portion of tooth crown bearing apicobasal striations labially and lingually. Differs from Colognathus obscurus in absence of large, mesiodistally elongate molariform posterior tooth (Sues et al. 2022).

Comment.

The phylogenetic position of Colognathidae remains unresolved. The extensive suite of jaw fragments and teeth referred to Colognathus obscurus ( Case, 1928) from the Upper Triassic of the United States has not been documented in detail to date.

References.

Sues and Schoch (2013 b), Sues et al. (2022).

Figures

Figure 10. Reptiles from the Lower Keuper Subgroup. A. Stem-turtle Pappochelys rosinae, holotype (SMNS 91360), partial postcranial skeleton. Scale bar: 1 cm. B. Rhynchocephalian Wirtembergia hauboldae, holotype (SMNS 91313), right maxilla in lateral view. Scale bar: 2 mm. C. Doswelliid archosauriform Jaxtasuchus salomoni (SMNS 91083), maxillary tooth. Scale bar: 1 mm. D. Colognathid Quasicolognathus eothen, holotype (SMNS 97019), left maxilla and prefrontal and possible palatine in lateral view. Scale bar: 2 mm. E. Doswelliid archosauriform Jaxtasuchus salomoni (SMNS 91085), lateral dorsal osteoderm in dorsal view. Scale bar: 1 cm.