title: A new species of Hypocristata (Nematoda, Trichostrongyuna, Heligmosomoidea) a parasite of Sigmodon hispidus (Cricetidae, Sigmodontinae) from Venezuela.
abstract: Description of Hypocristata tercera n. sp. (Heligmonellidae, Nippostrongylinae) a parasite of the small intestine of Sigmodon hispidus (Rodent, Sigmodontinae) from Venezuela. Two other species were described in the genus, both from Colombia and parasitic in Sigmodontinae. H. thomosomysi Durette-Desset, 1970, a parasite of Thomasomys sp. has about the same number of cuticular ridges at mid-body but differs by ridges having chitinoid struts, a caudal bursa pattern of type 2-2-1 (vs 1-3-1). H. anguillula Durette-Desset, 1970, a parasite of Sigmodontomys alfari (= Nectomys alfari) has the same caudal bursa pattern (type 1-3-1) but differs by the presence of ridges at mid-body in both sexes (absent at that level in H. tercera) and by ridges having chitinoid struts in female. This is the first report of the genus Hypocristata Durette-Desset, 1971 in Venezuela and in the genus Sigmodon (Sigmodontinae).
authors.affiliation: Département de Systématique et evolution, Muséum national d'Histoire naturelle, UMR 7138 associée au CNRS, CP 52, 61, rue Buffon, 75251 Paris, France. mcdd@mnhn.fr
authors.forename: M C
authors.initials: MC
authors.lastname: Durette-Desset
authors.forename: R A
authors.initials: RA
authors.lastname: Guerrero
mesh_terms: D000818:Animals; D005260:Female; D006369:Heligmosomatoidea / Q000033:anatomy & histology / Q000145:classification*; D007421:Intestine, Small / Q000469:parasitology; D008297:Male; D010802:Phylogeny; D012376:Rodent Diseases / Q000453:epidemiology / Q000469:parasitology*; D016205:Sigmodontinae / Q000469:parasitology*; D013045:Species Specificity; D017206:Strongylida Infections / Q000453:epidemiology / Q000469:parasitology / Q000662:veterinary*; D014687:Venezuela / Q000453:epidemiology