not a nudibranch

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time lapse of hooded nudibranch feeding

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Spanish Dancer nudibranch

Footage shot off the coast of the Gulf of Aqaba in the Red Sea. Known as Spanish dancers, these mollusks are usually only a couple inches long—but can grow up to a foot and a half in length.

The Alabaster Nudibranch can be found in the temperate waters of the Pacific, from Alaska to California and along the coasts of Russia and Japan. The beautiful, wispy white tipped cerata are actually the animal’s lungs. But don’t let it’s delicate form fool you, this nudi’s jaws are strong enough to crack open the shell of a snail, one of its preferred meals - photo taken at Seattle, Washington

Valentine’s Day is coming up, but this is no ordinary rose – it’s a Hopkins’ rose! 

This bright pink sea slug can be spotted in the tidepools of Monterey Bay National Marine Sanctuary. When tidepooling in search of these little invertebrates, tread lightly! Tidepools are fragile habitats and it’s all too easy to crush their tiny inhabitants. 

(Photo: Steve Lonhart/NOAA)

Ceratosoma trilobatum

Ceratosoma trilobatum is a species of colorful dorid nudibranch, a sea slug, a shell-less marine gastropod mollusk in the family Chromodorididae. This sea slug is widespread throughout the tropical waters of the Indo-Pacific area, from the oriental African coast to Japan, Red Sea included.Ceratosoma trilobatum can grow to a maximal size of 15 cm length. It feeds on sponge.

photo credits: JennyHuang