A complete mandible of a new amphisbaenian reptile (Squamata, Amphisbaenia) from the late middle eocene (Bartonian, Mp 16) of France

ABSTRACTA new genus of amphisbaenian reptile, <i>Cuvieribaena carlgansi</i>, is decribed from the late middle Eocene of France. This material from the locality of Le Bretou (Phosphorites du Quercy) is an almost completely preserved mandible. The dentary bears six teeth, with the anterior-most one the largest. The anterior teeth are blunt and enlarged (‘amblyodont’), and their size and amblyodonty decrease posteriorly. The presence of well-developed amblyodont teeth indicates a durophagous diet. Durophagy has already been recognized in some amphisbaenids, and their high skull, short jaws, and robust tooth morphology predispose them to this durophagous lifestyle. Several other amphisbaenid specimens have also been recovered from Le Bretou, mainly trunk vertebrae and two incomplete dentaries. This material and the complete mandible show unambiguous morphological features tying them to Blanidae. <i>Cuvieribaena</i> is the earliest secure record of blanid lizards in the fossil record, confirmed by phylogenetic analysis.http://zoobank.org/urn:lsid:zoobank.org:pub:17454922-A121-447F-9D01-E4992ADB7D60SUPPLEMENTAL DATA—Supplemental materials are available for this article for free at www.tandfonline.com/UJVP

摘要：本文记述了产自法国中始新世晚期的蚓蜥类爬行动物（amphisbaenian reptile）一新属新种*Cuvieribaena carlgansi*。该标本采自勒布勒图（Le Bretou）产地（凯尔西磷矿组，Phosphorites du Quercy），为一件近乎完整的下颌骨。齿骨共具6枚牙齿，最前端的牙齿体型最大。前部牙齿钝圆且粗壮（amblyodont），其尺寸与钝齿特征均向后逐渐减弱。发达的钝齿型牙齿表明该物种具有硬食性（durophagous）食性。部分蚓蜥类（amphisbaenid）已被证实存在硬食性习性，其高颅型、短颌骨与粗壮的牙齿形态均适配这一食性。勒布勒图产地还产出了其他多件蚓蜥类标本，以躯干椎骨与2枚不完整齿骨为主。本次研究的所有标本（含该完整下颌骨）均具备明确的形态学特征，可归入布兰蜥蜴科（Blanidae）。系统发育分析证实，*Cuvieribaena* 是化石记录中已知最可靠的布兰蜥蜴科蜥蜴类群记录。
http://zoobank.org/urn:lsid:zoobank.org:pub:17454922-A121-447F-9D01-E4992ADB7D60
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