Allometric analysis of sexual dimorphism and morphological variation in two chromosome races of the Sceloporus grammicus complex (Squamata: Phrynosomatidae) from Mexico

Sexual dimorphism is a widespread feature in the Animal Kingdom. In lizards of Sceloporus grammicus complex, studies sexual that analyze allometric trajectories body traits remain unexplored. Here we investigate key phenotypic traits, including size (snout-vent length, SVL) as well head length (HL), width (HW), and forearm (FL). We use an approach to detect differences scale relationships among parts S. complex Mexico. focus on two chromosomal races within this F5 (2n = 34) FM2 46). found males are larger than females all morphological variables, pattern was confirmed both races. determined negative (SVL vs. HL HW), isometry FL) intersexual slopes SVL HW; showed steeper slopes. Thus, growth more pronounced females. Additionally, between-race these variables (F5 those race), which correlate with their divergence. discuss biological implications our findings relation selection natural selection.