Allometric growth and sexual dimorphism of the shell is evident in Malayemys macrocephala from the Chao Phraya River Basin of central Thailand. Differences in allometric growth between males and females produce sexually dimorphic adults. Adult females exhibit larger sizes and have relatively wider and higher shells and longer plastra than males.
Brophy, Timothy R., "Allometry and Sexual Dimorphism in the Snail-eating Turtle Malayemys macrocephala from the Chao Phraya River Basin of Central Thailand" (2006). Faculty Publications and Presentations. Paper 56.