A cryptic radiation of Caribbean sea slugs revealed by integrative analysis: '' (Sacoglossa: Caliphyllidae) is six distinct species.

Integrative studies have revealed cryptic radiations in several Caribbean lineages of heterobranch sea slugs, raising questions about the evolutionary mechanisms that promote speciation within the tropical Western Atlantic. Bergh, 1871 is a genus comprising 12 named species in the family Caliphyllidae that lack the photosynthetic ability of other sacoglossans but are noted for vibrant colours on the large cerata (dorsal leaf-like appendages) that characterize many species. Two species are widely reported from the Caribbean: (Trinchese, 1881) and Engel, 1927.