Comparative morphology of three South African Triviidae (Gastropoda: Prosobranchia) with the description of a new species

Gosliner, T.M.; Liltved, W.R.

Zoological Journal of the Linnean Society 74(2): 111-132


ISSN/ISBN: 0024-4082
Accession: 004996845

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Three species of Trivia were collected from subtidal habitats in the Cape of Good Hope Peninsula, South Africa. The morphology of T. ovulata (Lamarck 1811), T. millardi (Cate 1979) and T. verhoefi sp. nov. is described. Each species can be distinguished by a unique pattern of mantle coloration, conchological characters of the fossula and shape of the radular teeth. The central nervous system was examined and found to be of the same configuration in the 3 South African species. T. ovulata and T. verhoefi appear to be gonochoric while T. millardi is a protandric hermaphrodite. T. ovulata and T. millardi also differ in the position of the receptaculum seminis. Differences in internal morphology reported in previous work and the present study are discussed. The fact that the central nervous system of Trivia is euthyneurous is reconfirmed. T. ovulata and T. millardi were associated with colonial tunicates as previously recorded for other members of the genus.