About the Data
Species records include data on invasions history, distribution, ecology, impact, and more. These data were gathered from published literature and targeted surveys. All records have undergone expert review, unless otherwise noted.
Species Profiles
NEMESIS includes detailed information on about 500 species of marine and estuarine of invertebrates and algae introduced to the United States. Each record contains information on taxonomy, distribution, ecology, and impacts, as well as references.
Daily Invader
Catriona rickettsi
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.
Daily Invader for 2025-03-20