Redescription of Rhabdochona (Rhabdochona) acuminata (Nematoda: Rhabdochonidae) From Freshwater Fishes From Patagonia (Argentina), the Geographical Implications

CREMONTE , FLORENCIA; NAVONE, GRACIELA T; GOSZTONY, ATILA E; KUBA, LUISA; FLORENCIA CREMONTE

JOURNAL OF PARASITOLOGY

AMER SOC PARASITOLOGISTS

Año: 2002 vol. 88 p. 934 - 941

0022-3395

Rhabdochona (Rhabdochona) acuminata is redescribed from specimens parasitizing Diplomystes mesembrinus (Siluriformes: Diplomystidae) and Percichthys trucha (Perciformes: Percichthyidae) from the Chubut River, Patagonia, Argentina. The present report is the first record of this nematode in D. mesembrinus; it also confirms P. trucha as host and Patagonia as a region of distribution for R. (R.) acuminata. Morphological features of the species were described using light and scanning electron microscopy. Compared with previous descriptions from Brazil, a very similar morphology is observed. However, a large morphometric variability is found, mainly in body size, spicule ratio, and number and arrangement of pre- and postcloacal papillae.