Ostrowski de Núñez M, Quintana M G
Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II. 1428, Buenos Aires, Argentina.
Parasitol Res. 2008 Mar;102(4):647-55. doi: 10.1007/s00436-007-0806-2. Epub 2007 Dec 12.
A new species, Stephanoprora aylacostoma is described and its life cycle was resolved experimentally. The prosobranch snail Aylacostoma chloroticum Hylton Scott, collected in the Yacyretá dam, Province of Misiones, Argentina, was found naturally infected with large-tailed cercariae possessing a prepharyngeal body and corpuscles in the excretory system but lacking collar spines. Metacercariae, which encysted on the gills of experimentally infected fishes Cnesterodon decemmaculatus (Jenyns) and Poecilia reticulata (Peters) (Poecilidae), developed collar spines after 10 days. Tetragonopterid fishes Moenckhausia dichroura (Kner), Astyanax erythropterus (Holmberg) and Hyphesobrycon serpae (Durbin in Eigenmann) were found infected naturally. Sexually mature adults were recovered from domestic chicks at day 7 post-exposure. Eggs shed in chick faeces developed to miracidia within 13-15 days; sporocysts were found on the gills of snails. The new species differs from other species of the genus in its larger eggs, in the smaller, slender body and smaller collar spines of the adult and in the morphological and biological features of the larval stages.
描述了一个新物种，即艾氏斯蒂芬吸虫（Stephanoprora aylacostoma），并通过实验解析了其生命周期。在阿根廷米西奥内斯省亚西雷塔大坝采集的前鳃亚纲蜗牛绿艾氏螺（Aylacostoma chloroticum Hylton Scott），被发现自然感染了大型尾蚴，该尾蚴在排泄系统中有咽前体和小球，但没有领棘。在实验感染的鱼类双色食蚊鱼（Cnesterodon decemmaculatus (Jenyns)）和孔雀鱼（Poecilia reticulata (Peters)）（花鳉科）的鳃上形成的囊蚴，在10天后长出了领棘。发现四方口鱼类双线莫氏脂鲤（Moenckhausia dichroura (Kner)）、红鳍魮脂鲤（Astyanax erythropterus (Holmberg)）和红身魮脂鲤（Hyphesobrycon serpae (Durbin in Eigenmann)）自然感染。在暴露后第7天从家鸡体内回收了性成熟的成虫。鸡粪便中排出的卵在13 - 15天内发育成毛蚴；在蜗牛的鳃上发现了孢蚴。该新物种在卵较大以及成虫身体较小、细长且领棘较小，以及幼虫阶段的形态和生物学特征方面与该属的其他物种不同。
