Suttonema delta n.g., n.sp. (Nematoda: Trichostrongylina: Heligmosomoidea) from Oxymycterus rufus (Rodentia: Sigmodontinae) in Argentina.

DIGIANI, MARÍA CELINA; DURETTE-DESSET, MARIE-CLAUDE

SYSTEMATIC PARASITOLOGY

Springer

Año: 2003 vol. 55 p. 33 - 38

0165-5752

A new nippostrongyline, Suttonema delta n. g., n. sp., is described from the intestine of Oxymycterus rufus (Rodentia: Sigmodontinae) from Argentina, a host from which trichostrongylid nematodes were hitherto unknown. The new genus is very similar to Stilestrongylus Freitas, Lent & Almeida, 1937 and Malvinema Digiani, Sutton & Durette-Desset, 2002, both parasites of Neotropical sigmodontines, in the characters of the caudal bursa (with a pattern of type 1-4, asymmetrical with hypertophied right lobe) and the presence of cephalic structures resembling cuticular cordons. The larval synlophe is also identical to that of Stilestrongylus freitasi Durette-Desset, 1968. The new genus is differentiated by an adult synlophe with few ridges (9-12 at mid-body) of two different types: small, rounded ridges without cuticular support on dorsal side, and pointed ridges of unequal size on ventral side and lateral fields. It is also characterised by the presence of comaretes on the left ventral and ventral fields of the synlophe.