Vertebrate paleobiodiversity of the Early Cretaceous (Berriasian) Angeac-Charente Lagerstätte (southwestern France): implications for continental faunal turnover at the J / K boundary Author Allain, Ronan Author Vullo, Romain Author Rozada, Lee Author Anquetin, Jérémy Author Bourgeais, Renaud Author Goedert, Jean Author Lasseron, Maxime Author Martin, Jeremy E. Author Pérez-García, Adán Author Fabrègues, Claire Peyre De Author Royo-Torres, Rafael Author Augier, Dominique Author Bailly, Gilles text Geodiversitas 2022 2022-07-21 44 25 683 752 journal article 107849 10.5252/geodiversitas2022v44a25 d0184974-bea3-4f97-a2f8-98887ec4f87e 1638-9395 6902033 urn:lsid:zoobank.org:pub:EA12DCB7-A5BE-4763-B805-25087EBD726D Anura indet. ( Fig. 10 ) DESCRIPTION Despite a swampy paleoenvironment that might be suitable for their occurrence and preservation, anurans are relatively scarce among the microvertebrate material from Angeac-Charente. In Angeac-Charente, anurans are represented by isolated, fragmentary bones, such as fused zeugopods ( Fig. 10A, B ) and urostyles ( Fig. 10C, D ) Among fused zeugopods, some are sufficiently well preserved to allow their identification.For instance, the general shape and length (even if the proximal part is missing) of specimen ANG M-63 ( Fig. 10A, B ), as well as several other features, allow its identification as a tibiofibula ( Thomas 1996 ): presence of a tibiofibular groove, deeper on the anterior face, between the fused zeugopod, and presence of a tibial crest on the anterior face ( Fig. 10A ). Among well-known Early Cretaceous anuran families are the Alytidae (= “ Discoglossidae ”), but within this family, the tibia and fibula remain unfused ( Roček 2000 ), unlike the Angeac-Charente specimen. FIG. 9. — Albanerpetontid remains from Angeac-Charente: A , B , left dentary of Albanerpetontidae indet. (ANG M-101) in lingual ( A ) and dorsal ( B ) views; C , premaxillary of Albanerpetontidae indet. (ANG M-102) in ventrolingual view; D , E , left maxillary of Albanerpetontidae indet. (ANG M-51) in labial ( D ) and lingual ( E ) views; F , G , dentary fragment of Albanerpetontidae indet. (ANG M-35) in labial view showing foramina discussed in the text ( F ) and lingual ( G ) view; H , distal end of a left humerus of Albanerpetontidae indet. (ANG M-36) in ventral view; I -K , dorsal vertebra of Albanerpetontidae indet. (ANG M-103) in dorsal ( I ), anterior ( J ) and lateral ( K ) views. Scale bars: A-E, H-K, 400 µm; F, G, 1 mm. FIG. 10. — Anuran remains from Angeac-Charente: A , B , right tibiofibular of Anura indet.(ANG M-63) in anterior ( A ) and posterior ( B ) views; C , D , urostyle of Anura indet. (ANG M- 64) in dorsal ( C ) and ventral ( D ) views. Scale bar represents: A , B , 5 mm; C , D , 2 mm. The specimen ANG M-64 ( Fig. 10C, D ) bears two broad and flattened articular facets anteriorly, and a small crest arises from its dorsal face. Four weakly marked ridges can be seen alongside this small crest, two on each side ( Fig. 9C ). This morphology identifies it as a urostyle. To date, incompleteness of the material limits comparisons with other Mesozoic anurans.