A review of the mermithid parasites (Nematoda: Mermithidae) described from North American mosquitoes (Diptera: Culicidae) with descriptions of three new species
Romanomermis Coman, 1961 is resurrected from the synonymy of Eurymermis Müller, 1931, the generic description is augmented, and three new species are described: Romanomermis kiktoreak, R. hermaphrodita, and R. culicivorax. R. culicivorax is a segregate of a complex known previously as Reesimermis nielseni Tsai and Grundmann, 1969. R. nielseni is restricted to a species known only from Wyoming. Reesimermis Tsai and Grundmann is suppressed and R. nielseni s.str. is transferred to Romanomermis. Reesimermis muspratti Obiamiwe and Macdonald is moved to Octomyomermis Johnson. Keys are provided for the world species of Romanomermis and for the described mermithids that infect mosquitoes in North America. A brief commentary is included on the taxonomic utility of length and degree of fusion of the spicules, body shape, cuticular fibres, and double molt to adult.