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.

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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.

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Daily Invader

Molgula ficus

Molgula ficus

Molgula
Molgula ficus is a solitary tunicate native to Australia and the Indo-West Pacific region including the Gulf of Thailand, Singapore and Hong Kong. In the East Pacific, it was discovered in surveys in Southern California between 1994 and 1997, but may have been introduced earlier. It was originally misidentified as the native California species Molgula verrucifera, but is much larger, and is not a brooder. Since its discovery in Southern California it has been found from San Diego Bay, north to Channel Islands Harbor, adjacent to Port Hueneme. One additional collection was made in San Francisco Bay near Alameda in 2005, but it does not appear to be established here. It was probably introduced through ship fouling. There are no reported impacts in California, but in Chile where it was introduced in 1997, it has caused problems for scallop aquaculture by fouling ropes and other equipment.

Daily Invader for 2022-06-28

Image Credit Brianna Tracy, University of San Diego
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