Abstract
The life-cycle of Orthetrotrema monostomum, a progenetic trematode occurring in the haemocoel of dragonfly naiads is described. The snail Thiara tuberculata acts as the intermediate host. The cercaria is xiphidiocercous, monostomate and belongs to the “Microcotylous” group. The course of development of the cercaria into a mature adult fluke is followed in the haemocoel of dragon-fly naiads which had been exposed to cercariae. On the basis of intraspecific variations noted in the adult flukes obtained experimentally from dragon-fly naiads, O. longicaeca Hanumantha Rao & Swamy, 1975 is synonymised with O. monostomum. Evidence is provided for the inclusion of the genus Orthetrotrema in the family Eumegacetidae. The diagnosis of the family Eumegacetidae is amended.
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