Resumo

FALCON ORDAZ, Jorge  e  SANABRIA ESPINOZA, María de Los Angeles. Dos nuevas especies de Stilestrongylus (Nematoda: Heligmonellidae) parásitos de peromyscus (Rodentia: Cricetidae) de México. Rev. biol. trop [online]. 1999, vol.47, n.4, pp.929-937. ISSN 0034-7744.

Stilestrongylus peromysci n. sp. collected from Peromyscus difficilis (Hidalgo state, México), differs from other species in the genus in number of the spines (30) in the synlophe (both sexes) and because the eigth ray arises from the root of the ninth ray; S. hidalguensis n. sp. parasited Peromyscus sp. and differs from all other congeneric species in the presence of 24 spines in the male synlophe and in the arrangement of the bursal rays (2-2-1 in the right lobe and 2-3 in the left lobe). A key to the species of Stilestrongylus is provided.

Palavras-chave : Nematoda; Heligmosomidae; Stilestrongylus peromysci; Stilestrongylus hidalguensis; Peromyscus spp; P. difficilis.