Didemnum vexillum is a species of tunicate in the family Didemnidae. Native to the waters around Japan, it has been reported as an invasive species in a number of places in Europe and North America, most recently in Strangford Lough, Northern Ireland.
This bottom colonizing tunicate can build over most substrates including cobble and will grow over other organisms when it needs more room to expand. Its appearance has given rise to its common name marine vomit.
- Invasive marine species discovered
- Carpet sea squirt found in Lough
- Leeuw, T; Boss, ES; Slade, WH (2011). "Spectral Reflectance as a Method to Identify the Invasive Tunicate Didemnum vexillum". In: Pollock NW, ed. Diving for Science 2011. Proceedings of the American Academy of Underwater Sciences 30th Symposium. Dauphin Island, AL: AAUS; 2011. Retrieved 2013-03-18.
- Woods Hole page on Didemnum
- (USGS) National Geologic Studies of Benthic Habitats, Northeastern United States has a Marine Nuisance Species page dedicated to this genus
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