Pycnodontidae, Agassiz, 1835

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 : 692

Pycnodontidae indet. ( Fig. 6 D-F)

DESCRIPTION

A second pycnodontiform taxon is represented by beanshaped to suboval teeth with a transverse groove or depression and one or two lateral tubercles ( Fig. 6 D-F). This taxon is also present in the Purbeckian facies of Cherves-de-Cognac, and has been described as “tooth morphotype 7” by Pouech et al. (2015: fig. 8b). A very similar and likely congeneric form has also been described from the Wealden facies of southern England as Coelodus sp. ( Sweetman et al. 2014) then assigned to Ocloedus sp. ( Sweetman 2016) . However, the English material includes nearly complete vomerine dentitions with three tooth rows ( Sweetman et al. 2014: fig. 10e), indicating that this unnamed species does not belong to either Coelodus or Ocloedus , which both have five vomerine tooth rows (Poyato-Ariza & Wenz 2002). Numerous ventral keel scales showing contacting spines of anteroposteriorly increasing size, can be assigned to Pycnodontidae (see Poyato-Ariza & Wenz 2002; Sweetman et al. 2014).

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.