Analysis of information sources in references of the Wikipedia article "Diploderma polygonatum" in English language version.
Three subspecies are recognized (Ota 1991): Japalura polygonata polygonata (greatest part of Ryukyu Islands); J. p. ishigakiensis Van Denburgh, 1912 (Yaeyama group, southern Ryukyu Islands); J. p. xanthostoma Ota, 1991 (lowlands of ...
Some of them are diurnally arboreal species such as Japalura polygonata xanthostoma (H. Lin, unpubl. obs.).
The splenial is generally reduced (e.g., Japalura polygonata, Trapelus agilis), absent, or fused (Moody, 1980), but remains long in the Cretaceous genus Mimeosaurus (Gao and Hou, 1995).