A New Subspecies of Slider Turtle (Pseudemys scripta) from Coahuila, México

A zoological paper documents recognition and description of a previously unrecognized slider-turtle subspecies from the Cuatro Ciénegas basin in Coahuila, México. It provides a designated holotype, a large series of paratypes, measurements and diagnostic comparisons with a closely related subspecies, and detailed morphological descriptions of carapace, plastron, head, and soft-part coloration in both preserved and living specimens. Key distinguishing features include an extensive interconnected black plastral pattern, a tendency toward melanism, a coarsely serrate lower jaw, ventrally reflected femoral plastral margins, and specific relative scute proportions; the paper also defines the local geographic range and taxonomic context.