Index
Guide for marine zone:
NUDIBRANCHIA
Opisthobranchs with the naked gills.
Doridina
Nudibranchs with plumage of gills in the back of the body, which can hide when threatened. The name Doris comes from Greek mythology was a nymph daughter of Ocean and Tethys.
Doridoidea
Onchidoridoidea
Phyllidioidea
Polyceroidea
Cladobranchia
Nudibranchs with abundant and colourful cerates where the stinging cells of the hydrates of which they feed are accumulated.
Aeolidioidea
Arminoidea
Dendronotoidea
Fionoidea
Proctonotoidea
Tritonioidea
SACOGLOSSA
Opisthobranch group with very different morphologies, including shelled and unshelled species, with and without parapods or dorsal appendices. The head usually has a single pair of rhinophores. They usually feed on the cellular liquid of seaweed.
Oxynooidea
Plakobranchoidea
APLYSIIDA
Opisthobranchs with the very large parapods they use to swim. Rhinophores like rabbit ears, which is why they are called "sea hares".
Akeroidea
Aplysioidea
UMBRACULIDA
Opisthobranchs with gills on one side of the body and outer shell in the form of a hat.
Umbraculoidea
PLEUROBRANCHIDA
Opisthobranchs that present gills on one side and an internal shell (and therefore not visible). They present a globular body.
PLEUROBRANCHOIDEA
CEPHALASPIDEA
Opisthobranchs with an inner shell inside the head in the form of a "shield", covered by the parapods. They are usually buried in the sand.
Bulloidea
Cylichnoidea
Haminoeoidea
Philinoidea
RUNCINACEA
Recently split the group of Cefalaspidea due to having the body not segmented in two parts, like the other members of the group. In the Mediterranean, it only includes the genus Runcina.
