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The iconic gastropod genus  Cyphoma  is commonly observed in the Caribbean, where it lives in association with various octocorallian hosts. Each species in the genus  Cyphoma  has a unique, characteristic mantle pattern and colouration, which separates the valid taxa. Because of its abundance and recognisability  Cyphoma gibbosum  has been used as a model organism in several studies concerning allelochemicals, reef degradation, and physical defence mechanisms. Molecular analyses based on four molecular markers (COI, 16S, H3 and 28S) for three  Cyphoma  species ( C. gibbosum ,  C. mcgintyi ,  C. signatum ) and an unidentified black morph, collected from three localities in the Caribbean, show that they represent morphological varieties of a single, genetically homogeneous species. This outcome is in agreement with previous anatomical studies. As a result  C. mcgintyi  and  C. signatum  are synonymised with  C. gibbosum , which is a key result for future work using  C. gibbosum  as a model organism. The striking morphological differences in mantle pattern and colouration are hypothesised to be the result of one of three possible scenarios: rapid divergence, supergenes (including balanced polymorphism), or incipient speciation.

Coat of many colours—DNA reveals polymorphism of mantle patterns and colouration in CaribbeanCyphomaRöding, 1798 (Gastropoda, Ovulidae)