SYSTEMATIC STATUS AND FIRST DESCRIPTION OF MALE OF DUJARDINIA-CENOTAEPEARSE, 1936 [EQUALS HYSTEROTHYLACIUM-CENOTAE (PEARSE, 1936) MORAVEC ET-AL, 1995] (NEMATODA, ANISAKIDAE)

A new collection of adult anisakid nematodes from the intestine of the catfish Rhamdia guatemalensis from two cenotes (= sinkholes) and a ca ve in the Yucatan Peninsula, southeastern Mexico, has shown that they are conspecific with those inadequately described as Dujardinia cenota e Pearse, 1936, The female is redescribed and the male is described fo r the first time. The morphology of this species shows that it belongs to the genus Hysterothylacium. This is the only Hysterothylacium spec ies recorded from freshwater fishes in Mexico and it may well be endem ic to cenotes and caves of the Yucatan Peninsula.