A redescription ofCoitocaecum parvumCrowcroft, 1945 (Digenea: Allocreadiidae) from crustacean and fish hosts in Canterbury

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Abstract
The identity and life history of a digenetic trematode commonly found as a metacercaria in the mysid Tenagomysis chiltoni Tattersall, 1923 and in the amphipod Paracalliope fluviatilis (Thomson, 1879) are discussed. Naturally infected mysids and experimentally infected amphipods were fed to the common bully, Gobiomorphus cotidianus McDowall, 1975. Adult worms were recovered after 4 weeks and were identical to pro-genetic metacercariae from mysids and amphipods. They closely resembled Coitocaecum parvum Crowcroft, 1945 from Tasmania, and worms identified by MacFarlane (1939) as Coitocaecum anaspidis Hickman, 1934. They differed from the type specimens of C. anaspidis in the position of the genital pore, shape of the cirrus-sac, extent of the vitelline follicles, and in their body size. Differences between worms from Canterbury and the type specimens of C. parvum are considered to be insufficient to regard them as being separate species. The adult of Coitocaecum parvum is redescribed. The mysid T. chiltoni is reported as a new host for Coitocaecum parvum.