Identification by anatomy and gel electrophoresis of Phalloceros caudimaculatus (Poeciliidae), previously mistaken for Gambusia affinis holbrooki (Poeciliidae)

Abstract

A small poeciliid fish thought to be G. a. holbrooki was identified anatomically as P. caudimaculatus. Gel electrophoresis confirmed the absence of hybrids between the two species. Reference to G. a. holbrooki in the literature suggests misidentification at other locations. It should be recognized that P. caudimaculatus is quite distinct from G. affinis.