Morphometric data to describe phenotypical variation across Pygmy and Marbled newts (genus Triturus)

An extensive dataset on the external morphology of pygmy and marbled newts
was used to explore the static allometry of sexual size dimorphism (SSD)
and Rensch’s rule (RR). Females were larger in trunk and head
sizes, whereas males had longer limbs and digits. Divergences in
trunk and head dimensions between sexes were achieved along a common
allometric slope rather than by a change in the slope’s direction, most
often through a shift in the intercept. Sexual dimorphism in
finger and toe length was unrelated to body size. The change in
SSD with a change in body size (RR) was confirmed for female-biased
traits. RR was unrelated to changes in static allometric slopes.