Abstract: This profile reviews the taxonomy, identification, distribution, habitat, biology, and aquarium care of Xiphophorus nezahualcoyotl, a northern swordtail endemic to northeastern Mexico. It summarizes the species’ historical recognition, distinctive morphology, and occurrence across river, spring, and pool habitats within the Río Pánuco and Río Tamesí regions. The account also discusses sexual dimorphism, courtship, mating behavior, livebearing reproduction, and social interactions, along with practical information on maintenance and breeding in captivity. Particular attention is given to the species’ complex evolutionary history, including conflicting genetic signals and evidence of past hybridization, while also considering its conservation status and remaining gaps in knowledge of its natural ecology.

ZooBank:7541FA54-A899-466E-9F1A-FC35DE5FC8C6.

Original description as Xiphophorus nezahualcoyotl:

Rauchenberger, Mary & K.D. Kallman, D.C. Morizot. 1990. "Monophyly and geography of the Río Pánuco Basin swordtails (Genus Xiphophorus) with descriptions of four new species". American Museum Novitates. (2975):1-41 - [abstract] · (ffm00052)