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Tunicate colonies of Didemnum
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Subphylum: Tunicata
Class: Ascidiacea
Order: Aplousobranchia
Family: Didemnidae
Genus: Didemnum
Savigny, 1816

Didemnum is a genus of tunicates in the family Didemnidae. Some Didemnum species, including Didemnum vexillum and Didemnum perlucidem can be characterized as invasive species.[1] In early 2006, Didemnum was estimated to inhabit more than 175 square kilometers of the undersea region off the East Coast of the United States. Didemnum invasions have also been recorded in Canada, the West Coast of the United States, New Zealand, the Mediterranean, and the Netherlands.[2]

Didemnum vexillum turned up on coast of state of Washington in 2009 and has been showing up in Coos Bay and Winchester Bay, Oregon as of 13 May 2010.[3]


Tunicate colonies of Didemnum sp. overgrowing the fronds of dark green algae. These colonies can quickly overgrow most surfaces and other organisms.


  1. ^ "Marine Nuisance Species" Woods Hole Coastal and Marine Center 2/2016"
  2. ^ "Invasion der Pfankuchen" Der Spiegel, 1/2006, p. 102
  3. ^ http://www.oregonlive.com/environment/index.ssf/2010/05/fast-growing_invasive_species.html
  • Woods Hole
  • (USGS) National Geologic Studies of Benthic Habitats, Northeastern United States has a Marine Nuisance Species page dedicated to this genus

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