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Doridacea
Most nudibranchs of the suborder Doridacea are distinguished by a circle of gills surrounding a dorsally positioned anus. In some, however, the dorsal gills have been lost (for example in the family Phyllidiidae which has evolved secondary gills between the mantle and foot). In some species, often referred to as cryptobranch dorids, the body is flattened and the gills can be retracted into pockets. In others, often referred to as phanerobranch dorids, the body is elongate and the gills can not be retracted into pockets. Cryptobranch dorids are primarily sponge feeders (often retaining toxins or spicules from their food for use in their own defense) while phanerobranch dorids are specialized predators on various taxa. There are at least 15 families known from Hawaii.

Dorididae

Cadlinidae

Discodorididae

Actinocyclidae





Chromodorididae

Dendrodorididae

Phyllidiidae

Hexabranchidae





Goniodorididae

Calycidorididae

Onchidorididae

Aegiridae





Gymnodorididae

Polyceridae

Vayssiereidae

 
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