Constantinos Petrinos / Purple nudibranch (Flabellina affinis) Athens, Attica Region, Greece. Saronic Gulf, Aegean Sea. August.

Constantinos Petrinos / Purple nudibranch (Flabellina affinis) Athens, Attica Region, Greece. Saronic Gulf, Aegean Sea. August.

MYN / Dimitris Poursanidis / Ventral view of Mediterranean Violet Aeolid (Flabellina affinis) Crete, Greece, November. Meetyourneighbours.net project

Alex Mustard / Aeolid nudibranch (Flabellina pedata) feeding on its prey of hydroids. This species cannot only eat the stinging hydroids without getting stung, but the stinging nematocysts of the hydoid pass through...

Alex Mustard / Nudibranch (Flabellina lineata), taken in the field in Gulen, Norway. North East Atlantic Ocean.

Alex Mustard / Nudibranch (Flabellina lineata) photographed in the field aquarium, Gulen, Norway. North East Atlantic Ocean.

Alex Mustard / A portrait of a nudibranch (Flabellina pellucida) on a kelp frond. Gulen, Norway. North East Atlantic Ocean.

Alex Mustard / Nudibranch (Flabellina nobilis) feeding on a solitary hydroid (Tubularia indivisa) and laying eggs. Gulen, Bergen, Norway. North East Atlantic Ocean.

Alex Mustard / A nudibranch (Flabellina lineata) feeding on a solitary hydroid (Tubularia indivisa). Gulen, Bergen, Norway. North East Atlantic Ocean.

Alex Mustard / A nudibranch (Flabellina verrucosa) on kelp. Eyjafjordur, near Akureyri, northern Iceland. North Atlantic Ocean. There are also many small copepods (>1mm) on the kelp.

MYN / Sheri Mandel / Spanish shawl (Flabellina iodinea), Malibu, California, USA, May, meetyourneighbours.net project

Franco Banfi / Nudibranch (Flabellina affinis) close to Teti wreck, Vis Island, Croatia, Adriatic Sea, Mediterranean