Hermissenda crassicornis

Sometimes known as the “opalescent sea slug”, H. crassicornis is a species of Facelinid nuibranch which inhabits coastal intertidal zones from Alaska south to Mexico. Like other nudibranch species H. crassicornis feeds mainly on sessile invertebrates, specifically hydrioids and occasionally sea anemones, tunicates, and others. 


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Images: Brocken Inaglory and Jmalin

Glaucus marginatus

…a small species of pelagic aeolid nudibranch in the family Glaucidae, which also houses its more famous cousin G. atlanticus. G. marinatus is commonly seen throughout the Pacific Ocean, where like G. atlanticus it spends its time floating upside down on the ocean’s surface, feeding on colonial cnidarians such as the Portuguese Man of War. 


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Image: dapete