Studies on Echinostomatidae (Trematoda) in Malaya. XI. The life history of Echinostoma hystricosum sp.n.

摘要: The life cycle of Echinostoma hystricosum, a new species with 47 collar spines, is described. There are more than two redial generations. snail Lymnaea rubiginosa (Michelin) served as first intermediate host. This and several other freshwater snails, such Gyraulus convexiusculus (Hutton) Indoplanorbis exustus (Deshayes), serve second hosts. Adult worms were obtained experimentally in birds: white-headed munias, Lonchura maja (L.); barred ground or zebra doves, Geopelia striata spotted punctulata (L.). (Michelin), abundant paddy fields, ponds, water collections the Kuala Lumpur area, harbors four echinostome cercariae: cercariae Hypoderaeum dingeri Lie, 1964; audyi Lie Umathevy, 1965; Echinoparyphium dunni an undescribed spines. cycles three have been described (Lie, 1964a; 1965a, b). paper reports fourth species. MATERIAL AND METHODS Metacercarial cysts by exposing clean laboratory-bred to shed naturally infected snails. Eggs collected from feces birds fed these metacercariae starting point for study. Techniques employed same used previous studies 1963, 1964a, b; All measurements microns, unless otherwise stated.