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.
Highlights
The family Hystrignathidae includes a large number of monoxenous nematodes from passalid beetles
The type genus of the family, Hystrignathus Leidy, 1850, is characterized by having a single cephalic annule, the cervical cuticle armed with opposite rows of spines, procorpus clavate and genital tract didelphic-amphidelphic (Adamson and Van Waerebeke 1992)
21 species are described, 11 of which are from Brazil, where the group have received major attention (Travassos and Kloss 1957a, b, 1958)
Summary
The family Hystrignathidae includes a large number of monoxenous nematodes from passalid beetles. The type genus of the family, Hystrignathus Leidy, 1850, is characterized by having a single cephalic annule, the cervical cuticle armed with opposite rows of spines, procorpus clavate and genital tract didelphic-amphidelphic (Adamson and Van Waerebeke 1992).
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