Some Beautiful Nudibranch photos by David Hall......

Main photo 'A giant dendronotid nudibranch swimming in mid-water'

Above, 'The opalescent nudibranch is a predatory mollusk with no shell'

Above, 'Hooded Nudibranchs on Kelp'

Above, 'Hooded Nudibranchs'

Above, 'Hooded Nudibranch, Melibe leonina - British Columbia, Canada'

Above, 'Opalescent nudibranchs and ascidians'

Above, 'Sea Lemon Nudibranch, Anisodoris nobilis - British Columbia, Canada'

Above, 'Nudibranchs (Nembrotha kubaryana) feeding on stalked ascidians. All nudibranchs are carnivorous, mostly preying upon sessile invertebrates such as ascidians, sponges, bryozoans and cnidarians (hydroids, corals, anemones). (Komodo, Indonesia) (photo: Gayle Jamison)'

Above, 'Nudibranch, Miamira magnifica - Izu, Japan'

Above, 'Hypselodoris infucata; Lembeh Strait, Indonesia'

Selected underwater photography here, more nudibranchs, and his books