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Gastropoda is probably the best-known taxon which uses acid glands as an antifouling strategy and as defence against putative predators. Here, defensive acid-secreting cell types in two taxa of Caeonogastropoda, Cypraeidae and Ovulidae, were investigated. This study confirms the presence of acid epithelial glands in several members of the Cypraeidae, with the glands of the Cypraeidae species  Naria nebrites  and  Mauritia mauritiana  being newly described here. We also present results for the first time on a member of the family Ovulidae,  Simnia spelta.  All investigated species exhibited an outer epidermis with glandular acid cells of columnar shape with large clear, colourless vacuoles, thus resembling the previously described species of these taxa. None of the investigated cypraeid and ovulid species studied here exhibited subepidermal acid glands in the mantle, which are typical for the Velutinoidea. The phylogenetic value of these findings is discussed in relation to a recently published phylogeny on Caenogastropoda comprising all families of Cypraeoidea and Velutinoidea.

Defensive acid-secreting glands in Cypraeoidea (Caenogastropoda, Mollusca)