A new genus of Nippostrongylinae (Nematoda: Heligmonellidae) from the water rat Scapteromys aquaticus in Argentina.

DIGIANI, MARÍA CELINA; SUTTON, CAROLA ANA; DURETTE-DESSET, MARIE-CLAUDE

JOURNAL OF PARASITOLOGY

Allen Press

Lugar: Lawrence, Kansas; Año: 2003 vol. 89 p. 124 - 132

0022-3395

A new genus of Nippostrongylinae, Malvinema n. gen., with 3 co-parasitic species Malvinema frederici n. sp., Malvinema carolinae n. sp., and Malvinema victoriae n. sp. from the intestine of the water rat, Scapteromys aquaticus Thomas (Rodentia: Muridae) from the northeast of Buenos Aires Province, Argentina, is proposed. The new genus shows similarities to 2 Neotropical Nippostrongylinae: Carolinensis (Travassos, 1937) by some characters of the synlophe and Stilestrongylus Freitas, Lent and Almeida, 1937 by the pattern of the caudal bursa. It is characterized by a synlophe with triple or quadruple gradient of size of the ridges, latero-median, decreasing from the largest left and right ridges. The gradient situated in the right ventral quadrant is always present. The caudal bursa shows a pattern of type 1-4. Malvinema frederici possesses a synlophe with 17 ridges and an axis of orientation inclined at 45° from the sagittal axis; M. carolinae possesses a synlophe with 22-24 ridges and an axis of orientation almost merged with the sagittal axis. Both species have a caudal bursa with the right lobe enlarged transversally. Malvinema victoriae possesses a synlophe with 22-24 ridges, an axis of orientation inclined at 45° from the sagittal axis and a caudal bursa with the right lobe enlarged vertically.