Micropycnodon sp.

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 : 691

cf. Micropycnodon sp.

( Fig. 6 A-C)

DESCRIPTION

Teeth attributed to Mesturidae , sub-circular to oval in occlusal view, are characterized by the presence of several small, sharp tubercles, arranged in rows or surrounding a shallow central depression ( Fig. 6 A-C). A nearly complete, relatively broad vomerine dentition shows six tooth rows ( Fig. 6A ). Crown morphology and tooth arrangement are similar to those of Micropycnodon ( Dunkle & Hibbard 1946; Cronin & Shimada 2019). Micropycnodon is known from the Late Cretaceous of North America, but similar genera (possibly subjective junior synonyms) known from the Early Jurassic of Germany ( Grimmenodon ; Stumpf et al. 2017) and the Early Cretaceous of Texas ( Texasensis pro Callodus ; Thurmond 1974; Özdikmen 2009) suggest a long temporal range for this lineage. The form in Angeac-Charente also occurs in the Purbeckian facies of Cherves-de-Cognac, and was described as “pycnodontiform tooth morphotype 10” by Pouech et al. (2015: fig. 8e-f).

Figures

FIG. 6. — Actinopterygian remains from Angeac-Charente: A, vomerine dentition of cf. Micropycnodon sp. (ANG M-69) in occlusal view; B, C, detailed view of an isolated vomerine tooth of cf. Micropycnodon sp. (ANG M-28) in (B) anterior and (C) occlusal views; D, E, isolated tooth of Pycnodontidae indet. (ANG M-50) in occlusal (D) and lateral (E) views; F, isolated tooth of Pycnodontidae indet. (ANG M-59) in lateral view. Scale bars: A, 2.5 mm; B, C, F, 500 µm; D, E, 1 mm.