Nudibranchs and their snail-related cousins form one of the subdivisions (Subclass Opisthobranchia) within Mollusca. Nudibranchs are found in reefs, and range in size from a few millimeters to a 40 to 50 centimeters. Their name means naked gill, and there are over 11,000 species in the world.
Gary Cobb's photo collection of Nudibranchs from Sunshine Coast, Australia
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