Body elongation and placentome evolution in the scincid lizard genus Chalcides (Squamata, Scincidae)

Abstract

This paper examines the differences in body morphology, clutch size and viviparity between relatively elongated and non‐elongated species of Chalcides. Reduction in egg size and placentome development in snake‐like species seem to be necessary consequences of evolutionary body attenuation in this group of skinks. In particular, the elliptic placenta might have evolved to maintain adequate clutch size by compensating for yolk mass reduction.

Key words:

• Chalcides
• Scincidae
• Body elongation
• Viviparity
• Placentome