title: Myxidium biliare sp. n. (Myxozoa) from gall bladder of Galaxias maculatus (Osmeriformes: Galaxiidae) in Patagonia (Argentina).
abstract: Myxidium biliare sp. n., a new myxosporean species parasitizing the gall bladder of Galaxias maculatus (Jenyns), in Patagonia, is described. Its coelozoic plasmodia were floating free in the bile. Spores are fusiform 13.7 +/- 0.9 microm long and 6.9 +/- 0.6 microm wide, with rounded ends in frontal view and slightly pointed ends in sutural view; shell with ridges and sinuous sutural line. Both maximum prevalence and maximum percentage of immature plasmodia occurred in summer. In winter the prevalence and the percentage of immature plasmodia fell to their lowest values. Prevalence was independent of host sex but increased with host length. Prevalence in 15 Patagonian Andean lakes (situated from 39 degrees 25'S to 41 degrees 30'S) ranged between 4.2% and 70%.
authors.affiliation: Laboratorio de Parasitología, Centro Regional Universitario Bariloche, Universidad Nacional del Comahue, Quintral 1250, (8400) San Carlos de Bariloche, Río Negro, Argentina. gviozzi@bariloche.com.ar
authors.forename: Gustavo P
authors.initials: GP
authors.lastname: Viozzi
authors.forename: Verónica R
authors.initials: VR
authors.lastname: Flores
mesh_terms: D000818:Animals; D001118:Argentina; D056890:Eukaryota / Q000302:isolation & purification* / Q000472:pathogenicity / Q000648:ultrastructure; D005260:Female; D005393:Fish Diseases / Q000469:parasitology*; D005704:Gallbladder / Q000469:parasitology; D008297:Male; D036441:Osmeriformes / Q000469:parasitology*; D012621:Seasons; D013170:Spores / Q000648:ultrastructure