A new genus of cystidicolid nematode from the stomach of Galaxias maculatus (Osmeriformes: Galaxiidae) in Patagonia (Argentina)

BRUGNI, NORMA; VIOZZI, GUSTAVO; FERNÁNDEZ, VALERIA; VEGA, ROCÍO

JOURNAL OF PARASITOLOGY

American Society for Parasitologist

Lugar: Lawrence, Kansas; Año: 2009 vol. 95 p. 151 - 155

0022-3395

During a parasitological survey of Galaxias maculatus (Jenyns) from Patagonian Andean Lakes, specimens of a new species of nematode were collected from the stomach of fish, and studied by light and scanning electron microscopy. This species is described as the only member of a newly proposed genus of Cystidicolidae by having oral opening dorsoventrally elongated, 2 lateral pseudolabia, 4 cephalic papillae, stoma (vestibule) elongated, esophagus divided into anterior muscular and posterior glandular sections, and caudal alae in males. Placonema n. gen. (Habronematoidea, Cystidicolidae) is characterized by the combination of the next features: oral opening dorsoventrally elongated demarcated by 4 sclerotized plates, and 2 well-developed pseudolabia projected to the buccal cavity, each pseudolabium with conspicouos, conical, anterior protuberances. Four cephalic papillae and deirids simple. Male with caudal alae, area rugosa absent, 4 pairs of preanal papillae, unpaired papilla present on anterior cloacal lip, and 6 pairs of postanal papillae. Larvigerous eggs without filaments. Placonema pataguense n. gen. n. sp. infects the stomach of G. maculatus from Lake Patagua (Patagonia, Argentina), being the first species of Cystidicolidae described from G. maculatus.