Polycera faeroensis

Polycera faeroensis is a translucent white nudibranch adorned with yellow processes and a distinctive yellow line along the ridge of its tail. The oral veil features eight or more yellow projections, while the gills and rhinophores are translucent white with yellow tips. Some individuals may exhibit yellow spots or lines on their bodies. This species can reach a total length of up to 30 mm and is distinguishable from Polycera quadrilineata by its more squat body shape and the greater number of processes on the oral veil. Originally described from the Faeroe Islands, this nudibranch is commonly found in the northeast Atlantic, extending as far south as Portugal. It inhabits shallow waters and is typically found at depths shallower than 40 meters, with most occurrences recorded at depths around 30 meters or less. Polycera faeroensis primarily feeds on erect bryozoans, including Bicellariella ciliata and Bugula flabellata, as well as members of the family Crisiidae. As a simultaneous hermaphrodite, Polycera faeroensis engages in a unique mating behavior where individuals dart their penises toward each other to determine roles as male or female. Eggs are laid on a suitable substrate, where they develop into a planktonic larval stage before maturing into adults. Encountering this nudibranch during a dive can be intriguing, as divers may observe its distinctive features and feeding behaviors in its natural habitat. The conservation status of Polycera faeroensis has not been evaluated by the IUCN.