 The different species of Eucteniza are distinguished by differences in body size, limb proportions, number of tibial spines, and shape of female sperm receptacles, as well as geographic location. Most species are known from male specimens only, but E. rosalia and E. panchovillai are known only from female specimens. Eucteniza species are distributed throughout central and northern Mexico, much of Texas, and the lower part of the Baja Peninsula. Many species are only known from the type locality, the site where the type specimen or specimens were originally collected. The species with the largest range is E. relata, although Bond and Godwin assert the species is actually composed of multiple as-yet-unnamed cryptic species (distinct species erroneously grouped into one) that will require additional morphological or genetic research to distinguish.
