Kechemir N
Ann Parasitol Hum Comp. 1978 Jan-Feb;53(1):75-92.
Research on the transmission of Hemiurid Trematode Halipegus ovocaudatus in experimental and natural conditions demonstrates the following: --the miracidium grows into a sporocyst producing rediae in the Mollusc Planorbis planorbis; -- the cystophorous cercariae become mesocercariae in the hemocoele of Copepodes or finally Ostracodes when swallowed; -- the mesocercariae become matacercariae in the mesenteron of larval Odonates (Zygoptera and Anisoptera) when these larvae swallow the Crustacea; -- the metacercariae become become adults in the Amphibial Rana ridibundal perezi which feeds on dragonflies. The four hosts (Mollusc -- Crustacean -- Odonat -- Amphibian) are obligatory in the life cycle for it is impossible to infect the Insects directly with the cecariae or the frog (tadpoles as well as adults) with the mesocercariae. The different stages of the life cycle of H. oveocaudatus aredescribed and the mode of the transmission is compared with the other species of Halipegus and with the Trematodes in general. The adaptative value of the lengthening of the cycle is discussed from the point of view of the conquest of terrestrial hosts by the Hemiurid Trematodes.
关于卵形哈氏吸虫（Halipegus ovocaudatus）在实验和自然条件下传播的研究表明：——毛蚴在扁卷螺（Planorbis planorbis）中发育成产生雷蚴的胞蚴；——尾蚴被吞食后，在桡足类动物或最终在介形虫的血腔中变成中尾蚴；——当蜻蜓幼虫吞食甲壳类动物时，中尾蚴在蜻蜓幼虫（均翅亚目和差翅亚目）的中肠中变成后尾蚴；——后尾蚴在以蜻蜓为食的泽蛙（Rana ridibundal perezi）中发育为成虫。这四个宿主（软体动物——甲壳类动物——蜻蜓——两栖动物）在生命周期中是必不可少的，因为不可能用尾蚴直接感染昆虫，也不可能用中尾蚴感染青蛙（蝌蚪和成虫）。本文描述了卵形哈氏吸虫生命周期的不同阶段，并将其传播方式与哈氏属的其他物种以及一般的吸虫进行了比较。从半尾吸虫征服陆地宿主的角度讨论了生命周期延长的适应价值。
