title: Hystrignathus dearmasi sp. n. (Oxyurida, Hystrignathidae), first record of a nematode parasitizing a Panamanian Passalidae (Insecta, Coleoptera).
abstract: Hystrignathus dearmasi sp. n. (Oxyurida: Hystrignathidae) is described from an unidentified passalid beetle (Coleoptera: Passalidae) from Panama. It resembles Hystrignathus cobbi Travassos & Kloss, 1957 from Brazil, by having a similar form of the cephalic end, extension of cervical spines and absence of lateral alae. It differs from the latter species by having the body shorter, the oesophagus and tail comparatively larger, the vulva situated more posterior and the eggs ridged. This species constitutes the first record of a nematode parasitizing a Panamanian passalid.
authors: Instituto de Ecología y Sistemática, Carretera de Varona km 31/2, Capdevila, Boyeros, A.P. 8029, C.P. 10800, Ciudad de La Habana, Cuba.
authors: Jans
authors: J
authors: Morffe
authors: Nayla
authors: N
authors: García