Two New Digenean Trematodes from New Zealand freshwater fishes

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Abstract
Two new trematode species, Deretrema philippae and Coitocaecum zealandicum, are described from New Zealand freshwater fishes. Deretrema philippae (from Galaxias divergens Stokell, 1959) is atypical of the genus in the lack of a prepharynx but closely resembles the genus in other respects. It is similar to D. minutum Manter, 1954, but D. minutum differs in the smaller size, presence of a prepharynx, anterior spination and fewer vitelline follicles. Both species are similar in their oocurrence in freshwater fishes. Coitocaecum, zealandicum (from Cheimarrichthys forsteri Haast, 1874) closely resembles C. gymnophallum Nicoll, 1915 and C. glandulosum Yamaguti, 1934 but differs from the former in the shape of the cirrus sac, the larger vitelline reservoir, and less anterior extension of the vitelline follicles; it differs from the latter in the absence of glands in the neck region.