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Carpet Sea-squirt, Didemnum vexillum


Short description of Didemnum vexillum, Carpet Sea-squirt

Pale orange, cream or off-white colonies forming extensive, thin (2-5 mm) sheets; can form long pendulous outgrowths. Firm, leathery texture and veined or marbled appearance. Numerous small pores in surface close when colony disturbed to produce tiny whitish spots; larger water exits occur at intervals.

Description of Didemnum vexillum, Carpet Sea-squirt status in GB

Carpet Sea-squirt has been recorded in a total of nine marinas in GB: N Wales (1), Devon (2), the Solent (5) and the Clyde (1).

Habitat summary: Didemnum vexillum, Carpet Sea-squirt

Recorded in GB only from marinas and adjacent shallow artificial structures.  In other areas of introduction, also occurs on natural cobble or gravel seabed to 80m depth, in tide pools on shore, in seagrass beds and on bivalve aquaculture installations.

Overview table

Environment: Marine
Species status: Non-Native
Native range: Northwestern Pacific
Functional type: Filter-feeder
Status in England: Non-Native
Status in Scotland: Non-Native
Status in Wales: Non-Native
Location of first record: Holyhead, Plymouth and Dart Estuary
Date of first record: 2008

Distribution map

Map of the UK with areas shaded to show the UK distribution of Carpet Sea-squirt

GB Distribution from NBN Atlas

Author's name:

John Bishop

Last updated:

January 6th, 2012

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