The nudibranchs in this superfamily share with the
Aeolidida the possession of dorsal
cerata. Unlike the cerata of aeolids they have either no
digestive gland or short digestive gland intrusions into the cerata and no
cnidosacs. In the
Goniaeolididae the digestive gland is ramified beneath the skin but does not extend into the cerata. The cerata are easily cast off and are probably defensive in purpose. In the
Proctonotidae the cerata are cored with extensions of the digestive gland which terminates midway up the ceras in some species and extends to the tip in others. The anus may be on the right-hand side of the body (as in
aeolids) or in the middle of the back towards the tail end (as in
dorids). ==References==