Holtonf: Observations on the life histo . . .

New Zealand Journal of Marine and Freshwater Research abstracts

Observations on the life history of Deretrema minutum Manter, 1954 (Digenea: Zoogonidae) in freshwater crustacean and fish hosts from Canterbury, New Zealand

A. L. HOLTONf

Department of Zoology University of Canterbury Private Bag, Christchurch, New Zealand

Abstract Two new hosts are recorded for Deretrema minutum Manter, 1954 from freshwater habitats at Lake Ellesmere, Canterbury. These are the mysid Tenagomysis 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. Ovi-gerous metacercariae were identical with adult D. minutum recovered from the intestine of freshwater fishes from Lake Ellesmere. A description of the metacercaria is given.

Keywords Digenea; Deretrema minutum; Crustacea; hosts; freshwater fish; Retropinna retropinna; Galaxias maculatus; Tenagomysis chiltoni.

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