A new nematode species, Cucullanus angeli n. sp., is described from specimens recovered from the intestine of Vieja intermedia (Günther, 1862) from the Lacantun River, State of Chiapas, Mexico. It is characterized largely by having an unusual distinct unpaired median papilla present on anterior cloacal lip in the male and the situation of phasmids (close to eighth pair of papillae); it is further characterized by equal spicules (length 175–475 μm), distribution of caudal papillae, a preanal sucker surrounded by first and second pair of papillae, and conical tail in both sexes, ending in small terminal digitiform process (being more conspicuous in the female).
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