Peramus 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 : 731

Peramus sp.

( Fig. 34 G-I)

DESCRIPTION

Peramuridae are represented by at least two lower molars. Only a left lower molar (ANG M-25), the talonid and the roots of which are missing, is figured herein ( Fig. 34 G-I). The talonid is present on the other molar, and it clearly displays a hypoconulid separated from the hypoconid, a diagnostic feature of Peramuridae ( Davis 2012) . The main cusp of the trigonid, i.e. the protoconid, is slightly inclined posteriorly ( Fig. 34H ). The paraconid is mesiodistally narrower and apicobasally shorter than the metaconid.It is located higher and in a more labial position. The metaconid is visible in labial view, whereas it is hidden by the protoconid in the Moroccan genus Minimus ( Sigogneau-Russell 1999).Both the anterolabial (cusp e) and the anterolateral (cusp f) marginal cuspules are preserved ( Fig.34G ). The latter is much more developed than the former. They define a strongly developed hypoconulid embrasure. All these features are more reminiscent of the lower molars (m2 and m3) of Peramus tenuirostris and P. dubius from the Berriasian of Dorset, England ( Clemens & Mills 1971), than to any other peramuran taxon (Sigogneau-Russell 1999). However, the scarcity of material prevents any comparison based on measurements, and does not allow a reliable specific identification ( Davis 2012). Thus, we assign this tooth to Peramus sp.

Figures

FIG. 34. — Trechnotherian mammal teeth from the Berriasian of Angeac-Charente: A, B, left lower molar of Spalacotherium evansae Ensom & Sigogneau-Russell, 2000 (ANG M-26) in occlusal (A) and lingual (B) views;C, D, left lower molar (m1 or?m2) of Dryolestidae indet.(ANG M-05) in occlusal (C) and linguodistal (D) views; E, F, left lower molar (m6 or?m7) of Dryolestidae indet. (ANG M-01) in occlusal (E) and mesial (F) views; G-I, left lower molar (m3?) of Peramus sp. (ANG M-25) in occlusal (G) labial (H) and lingual (I) views. Scale bars: 400 µm.