title: The life cycle of Pseudosellacotyla lutzi (Digenea: Cryptogonimidae), in Aylacostoma chloroticum (Prosobranchia: Thiaridae), and Hoplias malabaricus (Characiformes: Erythrinidae), in Argentina.
abstract: Pseudosellacotyla lutzi ( Freitas, 1941), at present included in the Faustulidae, is redescribed, and its life cycle was resolved experimentally. The prosobranch snail Aylacostoma chloroticum Hylton Scott (Thiaridae), collected in the Yacyretá Dam, Province of Misiones, Argentina, was found naturally infected with cercariae that lacked pigmented eyespots, and possessed 7 pairs of penetration glands, 8 pairs of flame cells, and a V-shaped excretory vesicle. The cercariae developed in oval cysts, which were found on fin rays, vertebrae, and spines of poeciliid and tetragonopterid fish species. Adults were obtained experimentally from Hoplias malabaricus (Erythrinidae) infected with metacercariae from albino Gymnocorymbus ternetzi (Tetragonopteridae), which had been exposed to emerging cercariae. Adults were also found in naturally infected H. malabaricus collected in the Yacyretá Dam. The morphology of the cercariae, and the characteristics of the life cycle show that P. lutzi should be included in the Cryptogonimidae.
authors.affiliation: Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Av. Angel Gallardo 470, C1405 DJR, Buenos Aires, Argentina.
authors.forename: Manuel G
authors.initials: MG
authors.lastname: Quintana
authors.forename: Margarita Ostrowski
authors.initials: MO
authors.lastname: de Núñez
mesh_terms: D000818:Animals; D001118:Argentina; D058487:Cercaria / Q000033:anatomy & histology / Q000254:growth & development; D060125:Characiformes / Q000469:parasitology*; D008018:Life Cycle Stages; D058488:Metacercariae / Q000033:anatomy & histology / Q000254:growth & development; D012908:Snails / Q000469:parasitology*; D014200:Trematoda / Q000254:growth & development*