Description
Original diagnosis after Cicimurri, Ciampaglio, Hoenig, Shell, Fuelling, Peterman, Cline & Jacquemin, 2024 [33014]: Generic diagnosis: Genus of durophagous hybodont shark characterized by presumed anterior teeth having a trilobed occlusal outline and mesio-distally wide but labio-lingually thin lateral teeth. Anterior teeth bear a robust medial cusp and one pair of lateral cusplets, whereas lateral teeth typically bear a small medial cusp and one to two pairs of very diminutive lateral cusplets. The labial and lingual crown faces are prominently convex in the areas of the medial cusplet and lateral cusplets. Additionally, teeth exhibit a prominent labial peg. The medial and lateral cusplets are generally connected by a transverse ridge, and additional, much shorter ridges may emanate from the cusp and/or cusplet apices. The tooth base is very high (apico-basally), averaging 63% of total tooth height (minimum 50%, maximum 75%). The base is also nearly as wide (mesio-distally) or even slightly wider than the crown, and it is labio-lingually thin, generally being one-half as wide as the crown. Furthermore, the base is highly vascularized, with a row of foramina occurring below the labial and/or lingual crown foot, as well as scattered throughout the surface of one or both faces and often the aboral surface.

Remarks
shark-references Species-ID=17406;
type species of Columnaodus Cicimurri, Ciampaglio, Hoenig, Shell, Fuelling, Peterman, Cline & Jacquemin, 2024 [33014] by monotypy (Art. 68.3 ICZN);

References