The scincid lizard Ateuchosaurus pellopleurus (Hallowell, 1861) has been recognized as a single species widely distributed in the Osumi, Tokara, Amami, and Okinawa Groups of the Ryukyu Archipelago, southern Japan. However, a recent molecular phylogenetic study suggested that this skink should be divided into two species: one distributed in the Osumi to Amami Groups, and another distributed in the Okinawa Group. For A. pellopleurus, two extant syntypes collected from an island of the Amami Group were confirmed. Therefore, we identified the species in the Osumi to Amami Groups as A. pellopleurus sensu stricto by designating one of the syntypes as the lectotype for this species. For the species in the Okinawa Group, we resurrected A. okinavensis (Thompson, 1912), of which the type locality is on Okinawajima Island in the Okinawa Group. Ateuchosaurus pellopleurus and A. okinavensis can be differentiated by the following characteristics: usually separated frontonasal and frontal, 8–14 subdigital scales on the fourth toe (mode = 11), and usually two or three pairs of dorsal median scale rows with black stripes in A. pellopleurus; usually fused frontonasal and frontal, 10–16 subdigital scales on the fourth toe (mode = 13), and usually no stripe on the dorsal scales or a pair of dorsal median scale rows with black stripes in A. okinavensis.

中文翻译：

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Ateuchosaurus pellopleurus（Hallowell，1861 年）（爬行动物、有鳞动物、Scincidae）的分类修订和重新描述以及 A. okinavensis 的复活（Thompson，1912 年）

scincid 蜥蜴 Ateuchosaurus pellopleurus (Hallowell, 1861) 已被确认为广泛分布于日本南部琉球群岛的大隅、托卡拉、奄美和冲绳群岛的单一物种。然而，最近的一项分子系统发育研究表明，这种石龙子应该分为两个物种：一个分布在大隅至奄美群，另一个分布在冲绳群。对于 A. pellopleurus，确认了从奄美群岛的一个岛屿收集的两个现存的合型。因此，我们通过将其中一个合型指定为该物种的选型，将 Osumi 至 Amami 群中的物种确定为 A. pellopleurus sensu stricto。对于冲绳群中的物种，我们复活了 A. okinavensis (Thompson, 1912)，其模式产地在冲绳群的冲绳岛。Ateuchosaurus pellopleurus 和 A. okinavensis 可以通过以下特征来区分：通常额鼻和额叶分开，第四脚趾上有 8-14 个指下鳞片（众数 = 11），并且通常有两到三对背侧中间鳞片行，中间有黑色条纹A. pellopleurus; 通常融合额鼻和额叶，第四个脚趾上有 10-16 个亚指鳞片（众数 = 13），通常在 A. okinavensis 的背鳞片上没有条纹或一对带有黑色条纹的背鳞片行。