Encrusting bryozoan on detritus of Macrocystis Porifera t
Nudibranchs are a group of sea slugs characterized by having no shell, thus having their gills exposed. The name in latin, nudibranchia means precisely that: nudi (nude, exposed) + branchia (gills).
Instead of the protective shell, the nudibranchs use other intricate defense mechanisms and that's one of the reasons they are such an interesting group to study. Not to mention their exquisite appearance.
More info about this species:
Taken with Nikonos V, 35mm lens and 1:3 extension tube, Nikonos SB-105 strobe on TTL and Fuji Provia 100F
Taken with Nikonos V, 35mm lens and 1:1 extension tube. Projected slide was later photographed with a Canon EOS 300D.
The Bryozoa, also known as Polyzoa, Ectoprocta or commonly as moss animals, are a phylum of aquatic invertebrate animals. Typically about 0.5 millimetres (0.020 in) long, they are filter feeders that sieve food particles out of the water using a retractable lophophore, a "crown" of tentacles lined with cilia. Most marine species live in tropical waters, but a few occur in oceanic trenches, and others are found in polar waters. One class lives only in a variety...