Taxonomy studies of extant taxa generally focus on external morphology, often ignoring all intraspecific variation, thus possibly creating morphospecies that do not correspond to valid taxonomic units. Additionally, osteological studies are often neglected, which could provide a lot of new information regarding morphological traits. Hence, studying not only osteology but also intraspecific variation in skeletal structures could be of great value for species description and separation. To better assess the relevance of intraspecific osteological variation for taxonomy, here, we analyze this variation in the skeleton of nine specimens of Iguana iguana. We observed considerable individual variability in skull bones, including differences in shape and proportions; variability in the atlas vertebra, which either presented or lacked a neural spine; and variation in the number of ribs; and, most notably, in caudal vertebrae morphotypes. The caudal vertebrae displayed significant variation among individuals, comprising seven distinct morphotypes that exhibited a consistent sequential pattern while also differing in count and presence. As a result, no specimen shared the same caudal vertebral pattern as another. We conclude that a species may present substantial variation in different osteological complexes. Therefore, evaluating intraspecific variation may help prevent the overestimation of the number of existing species. Moreover, understanding the estimated degree of variation in a determined extant taxon could be extrapolated to its fossil representatives. The present study thus highlights the importance of incorporating osteological individual variation into taxonomic analyses.