[Trichosomoides nasalis Biocca & Aurizi, 1961 and T. spratti n. sp. (Nematoda: Trichinelloidea), from the nasal cavity of murids].

The nematode parasite of the nasal mucosa of rodents, Trichosomoides nasalis, is common in the murid Arvicanthis niloticus, in Senegal. The morphological study of this material allowed us to augment the original description, made with specimens recovered in Italy from Rattus norvegicus. This analysis shows that specimens from Rattus fuscipes in Australia, which had been identified to this species, represent a distinct species (smaller, with an average of five intrauterine males per female instead of one), which we name T. spratti n. sp.