一、寄生性涡虫的分类涡虫纲(Turbellarian)在分类学上属于扁形动物门(Platyhelminthes),以浮游生物、小甲壳动物为食,现已发现4000多个物种。近年来许多学者以生殖系统和消化系统的结构为依据进行分类,列亚纲分为9个或11个目,不列亚纲,直接分为12个目。本文归纳的寄生性涡虫分布于涡虫纲的7个目,即原卵黄卵巢目、单肠目、异肠目、Proseriata、三肠目、Dalyellioida和切头目,见表1。 I. CLASSIFICATION OF PARASITIC PLANTS Turbellarian, taxonomically classified as Platyhelminthes, feeds on plankton and small crustacean and more than 4,000 species have been found. In recent years, many scholars based on the structure of the reproductive system and digestive system as a basis for classification, sub-class is divided into 9 or 11 orders, not the class, is divided directly into 12 heads. The parasitic planarians that are summarized in this paper are distributed in 7 orders of the genus Planidae, namely, the original egg yolk, Monogamy, Proseriata, Salmonella, Dalyellioida and cut heads.