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Genetic distinctness of three widespread and morphologically variable species of Drupella (Gastropoda,Muricidae)
Authors:M S Johnson  R L Cumming
Institution:(1) Department of Zoology, University of Western Australia, 6009 Nedlands, Western Australia, Australia;(2) Department of Marine Biology, James Cook University of North Queensland, 4811 Townsville, Queensland, Australia;(3) Present address: The Swire Marine Laboratory, The University of Hong Kong, Cape d'Aguilar, Shek O, Hong Kong
Abstract:Corallivorous gastropods of the genus Drupella have caused considerable damage to corals at widely separated reefs in the Indo-Pacific. Morphological variability of Drupella species within and between areas has caused taxonomic confusion. To clarify the relationships, we examined allozyme variation at 16 gene loci in samples from Western Australia, Queensland and Japan. Within sites, the species D. cornus, D. rugosa and D. fragum were distinguishable individually by each of 9 to 11 loci, with average genetic identities of about 0.25. The differences extended across sites, whereas the conspecific genetic identities over distances up to 6000 km were 0.86 to 1.00, supporting the view that there are three widespread species of Drupella. Nevertheless, there is much variation within species for allozymes, size, shape and colour.
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