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).