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Catriona rickettsi
Image courtesy of Dave Behrens
Catriona rickettsi
Taxonomic Group: Mollusks-Gastropods


Catriona rickettsi is a nudibranch commonly known as Rickett’s Aeolis. It was first described from San Francisco Bay, California in 1974, but its origin is unknown. It is considered introduced to the West Coast of North America because of its relatively recent discovery and its association with an introduced hydroid. There are scattered reports of this species from Northern Mexico to Oregon. It is found in tidepools, rocky shores, and harbors from warm-temperate to cold-temperate regions. There are no known impacts of this species in North America.

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Fofonoff PW, Ruiz GM, Steves B, Simkanin C, & Carlton JT (2018)
National Exotic Marine and Estuarine Species Information System.
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Marine Invasions Lab
Smithsonian Environmental Research Center

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