Abstract
Abstract Two new hosts are recorded for Deretrema minutum Manter, 1954 from freshwater habitats at Lake Ellesmere, Canterbury. These are the mysid Tenagotnysis chiltoni Tattersall, 1923 which acts as a second intermediate host and harbours the encysted metacercariae, and the smelt, Retropinna retropinna (Richardson, 1848), which contains adult worms. Adult D. minutum were also found in the inanga Galaxias maculatus Jenyns, 1842. A large proportion of metacercariae within the crustacean host exhibited progenesis which results in the production of numerous eggs. Ovigerous metacercariae were identical with adult D. minutum recovered from the intestine of freshwater fishes from Lake Ellesmere. A description of the metacercaria is given.
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