Sunnyodon 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 : 730

Sunnyodon sp.

( Fig. 33I, J )

DESCRIPTION

ANG M-04 is roughly oval in shape and has only two rows of cusps, with four main lingual cusps, and two main labial cusps and one posterior labial cuspule ( Fig. 33I, J ). It also possesses an incipient distal lingual ridge, with a small cuspule. All these features led us to assign this tooth to the genus Sunnyodon , a monospecific genus, S. notleyi , based on a single?P5 from the Berriasian of the Purbeck Group in England (Kielan-Jaworowska & Ensom, 1992). The Angeac-Charente tooth differs from the latter by the labial cusps that are more anteriorly located, whereas they are arranged symmetrically at the middle of the tooth length in S. notleyi , and by the absence of the anterior labial cuspule ( Fig. 33I ). This difference could be explained by the fact that these teeth belong to two different loci and/or two different species. This tooth is considered here to be a?P4 and it is referred to Sunnyodon sp. , although the validity of this genus can be debated. An upper posterior premolar of Sunnyodon has also been reported from the Berriasian strata of the Rabekke Formation on the island of Bornholm, Denmark ( Lindgren et al. 2004).

Figures

FIG. 33. — Multituberculate mammal teeth from Angeac-Charente: A, B, left p4 of Pinheirodontidae indet. (ANG M-72) in lingual (A) and labial (B) views; C, D, left P1 of Pinheirodontidae indet. (ANG M-03) in occlusal (C) and distolingual (D) views; E, F, right P2 of Pinheirodontidae indet. (ANG M-06) in occlusal (E) and lingual (F) views; G, H, left P3 of Pinheirodontidae indet. (ANG M-22) in occlusal (G) and lingual (H) views; I, J, left?P4 of Sunnyodon sp. (ANG M-04) in occlusal (I) and labial (J) views; K, L, left?P5 of Multituberculata indet. (ANG M-106) in mesio-occlusal (K) and occluso-labial (L) views; M, N, left?m2 of Pinheirodontidae indet. (ANG M- 105) in occlusal (M) and labial (N) views; O, P, right M2 of Pinheirodontidae indet. (ANG M-32) in occlusal (O) and lingual (P) views. Scale bar: A, B, 1 mm; C, D, 750 µm; E-P, 500 µm.