Triconodon, Owen, 1859

Allain, Ronan, Vullo, Romain, Rozada, Lee, Anquetin, Jérémy, Bourgeais, Renaud, Goedert, Jean, Lasseron, Maxime, Martin, Jeremy E., Pérez-García, Adán, Fabrègues, Claire Peyre De, Royo-Torres, Rafael, Augier, Dominique & Bailly, Gilles, 2022, Vertebrate paleobiodiversity of the Early Cretaceous (Berriasian) Angeac-Charente Lagerstätte (southwestern France): implications for continental faunal turnover at the J / K boundary, Geodiversitas 44 (25), pp. 683-752 : 728

Triconodon ? sp.

( Fig. 32E, F )

DESCRIPTION

The specimen ANG M-02 ( Fig. 32E, F ) consists of an almost complete tooth, only lacking the mesial root.

The crown is labiolingually compressed and bears three mesiodistally aligned cusps. A main central cusp a is largely dominant. It is triangular in lateral profile and surrounded by two smaller accessory cusps: cusp c (distal) reaches half of the height of cusp a, and cusp b (mesial) is about three times smaller than cusp c. Cusp a is slightly flexed lingually. Cusps a and c bear distolingually oriented wear facets. Both labial and lingual cingulid are present. Thus, considering these characters, ANG M-02 can be identified as an eutriconodontan left lower premolariform. It is somewhat similar to the p3 of Triconodon from the Berriasian of Britain ( Jäger et al. 2021), so the specimen is tentatively referred to this genus.

Figures

FIG. 32. — Mammal teeth from Angeac-Charente: A, B, premolariform or molariform tooth of Gobiconodon? sp. (ANG M-21) in occlusal (A) and labial (B) views; C, D, premolariform tooth of Mammalia indet. (ANG M-34) in lingual (C) and labial (D) views; E, F, left lower molar of Triconodon sp. (ANG M-02) in lingual (E) and occlusal (F) views; G-I, left upper molar of Thereuodon cf. taraktes (ANG M-23) in labial (G), lingual (H) and occlusal (I) views. Scale bar: 500 µm.