Description of a New Softshell Turtle from the Southeastern United States

A meticulous taxonomic revision from 1959 that formally introduces Trionyx muticus calvatus, a newly identified subspecies of softshell turtle inhabiting the Gulf Coast river systems. Robert G. Webb, drawing upon extensive fieldwork across Mississippi, Louisiana, and Florida, presents rigorous morphological examinations of holotype and paratype specimens, documenting the subtle distinctions that set this population apart from its relatives. The work catalogs specific diagnostic features: the distinctive spotting patterns adorning the carapace, the architecture of the snout and shell, and precise measurements that allow future researchers to distinguish this subspecies from neighboring forms. While firmly grounded in the technical conventions of mid-century herpetology, this publication represents a significant moment in the documentation of North American freshwater turtle biodiversity, providing the scientific foundation for recognizing a population that had previously gone undescribed.