Harold W. Manter, Studies on Digenetic Trematodes of Fishes of Fiji. II. Families Lepocreadiidae, Opistholebetidae, and Opecoelidae, The Journal of Parasitology, Vol. 49, No. 1 (Feb., 1963), pp. 99-113
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H. W. Manter (1963) studied this question.
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