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

Clavelina lepadiformis

Clavelina lepadiformis

Light bulb tunicate
The Light Bulb Tunicate, Clavelina lepadiformis, is a colonial tunicate with transparent zooids joined at the base by short stolons. Fully developed zooids are clear with white, yellow or pink bands around the oral siphon and dorsal lamina, giving them a light-bulb appearance. Clavelina lepadiformis is native to Europe, ranging from southern Norway to the Mediterranean Sea. It has been introduced to the Azores, South Africa, South Korea, and the US East Coast. It was first discovered in US waters in 2009 in Long Island Sound, Connecticut. The introduction of this species is probably a result of ship fouling. No impacts have been reported so far, but it is a recent introduction in North America and the introduced region is small.

Daily Invader for 2022-09-25

Image Credit Esculapio [CC-BY-3.0], via Wikimedia Commons
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