Fringeback Dondice

Dondice occidentalis

Fringeback Dondice is an elongate sea slug that tapers towards its posterior end. It features long, annulate rhinophores and oral tentacles that are longer than the rhinophores. Its translucent gray body is marked by a yellow or orange median line running from the head to the anterior end, with occasional white or blue broken lines and opaque white spots on the dorsum. Cerata are arranged in clusters along two dorsal rows and are often adorned with large blue or white bands. This species can grow up to 50 mm in length. Fringeback Dondice is found in a variety of locations across the Western Atlantic, including Florida, Mexico, and several Caribbean islands. It inhabits depths ranging from the surface to 26 metres, typically residing on hydroids and other submergent vegetation. The species has been recorded at depths up to 30 metres, with most occurrences shallower than 20 metres. Feeding primarily on hydroids, particularly those of the genus Eudendrium, this nudibranch exhibits interesting behavior by shedding its cerata when disturbed. It is a simultaneous hermaphrodite, engaging in mating behaviors where individuals exchange roles as male and female. Eggs are deposited on substrates, leading to a planktonic larval stage before developing into adults. Encountering Fringeback Dondice during a dive can be intriguing, as divers may observe its unique coloration and feeding habits in its natural habitat.