Amiiformes, Hay, 1929

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 : 694

Amiiformes indet.

( Figs 7 E-H; 8A-D)

DESCRIPTION

Amiiform fish are represented in the assemblage by isolated teeth, jaw remains ( Fig. 7 E-H) and vertebrae. Most of the labiolingually compressed teeth show a typical triangular crown apex and bear two well-developed carinae ( Fig. 8 A-C). Such teeth were previously referred to Caturus sp. ( Sweetman et al. 2014; Vullo et al. 2014; Pouech et al. 2015), although this dental morphology is also present in more derived members of Amiiformes (i.e., Amiidae ). Some tooth associations are interpreted as vomerine dentitions ( Fig. 8D ). These elements bear teeth of various sizes, subconical and devoid of carinae, as those found in many Amiiformes ( Grande & Bemis 1998) . It is worth noting that this tooth morphology corresponds to that usually assigned to the aspidorhynchid Belonostomus (e.g., Sweetman et al. 2014; Pouech et al. 2015). However, the rounded morphology of the vomerine tooth plates from Angeac-Charente and the fact that they are paired elements preclude assignment to Belonostomus (in which the vomer is unpaired); therefore, all isolated small teeth with a conical crown devoid of carinae are here referred to Amiiformes indet.

Figures

FIG. 7. — Actinopterygian remains from Angeac-Charente: A, B, isolated tooth of Ginglymodi indet. (ANG M-30) in anterior/posterior (A) and occlusal (B) views; C, Ginglymodi indet. scale (ANG M-68); D, Ginglymodi indet. scale (ANG M-67); E, upper jaw fragment of Amiiformes indet. (ANG M-62) in lingual view; F, left dentary of Amiiformes indet. (ANG M-117) in labial view; G, H, fragmentary left dentary of Amiiformes (ANG 15-4062) in lingual (G) and labial (H) views. Scale bar represents: A, B, 1 mm; C, 4 mm; D, 2 mm; E, 2.5 mm; F, 10 mm; G, H, 5 mm.

FIG. 8. — Actinopterygian remains from the Berriasian of Angeac-Charente:A, isolated tooth of Amiiformes indet. (ANG M-39); B, C, isolated tooth of Amiiformes indet. (ANG M-110); D, dentulous vomerine element of Amiiformes indet. (ANG M-56); E-G, isolated tooth of Ionoscopiformes indet. (ANG M-111); H, jaw frag- ment of Actinopterygii indet. (ANG M-38) in lingual view; I, vertebra of Actinopterygii indet. (ANG M-069). Scale bar: A-C, E-H, 500 µm; D, 250 µm; I, 2 mm.