Didemnum vexillum
Didemnum vexillum
(a colonial sea squirt)
Tunicates
Exotic
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17 results for Didemnum vexillum (a colonial sea squirt)
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Specimen IDStateCountyLocalityYear HUC Number What's this? Drainage nameStatus
623649 CAAlamedaBallena Bay2005 18050004 San Francisco Bayestablished
623705 CAAlamedaBallena Bay2010 18050004 San Francisco Bayestablished
623707 CAAlamedaDumbarton Bridge2010 18050004 San Francisco Bayestablished
623674 CAAlamedaPort of Oakland Office2010 18050004 San Francisco Bayestablished
623658 CASan FranciscoCentral Basin2005 18050004 San Francisco Bayestablished
623673 CASan FranciscoChina Basin2005 18050004 San Francisco Bayestablished
623659 CASan FranciscoPotrero Point2005 18050004 San Francisco Bayestablished
623682 CASan FranciscoPotrero Point2010 18050004 San Francisco Bayestablished
252810 CASan FranciscoSan Francisco Bay area1993 18050004 San Francisco Bayestablished
623671 CASan MateoCoyote Point Marina2005 18050004 San Francisco Bayestablished
623686 CASan MateoCoyote Point Marina2010 18050004 San Francisco Bayestablished
623662 CASan MateoRedwood Creek - Marina2005 18050004 San Francisco Bayestablished
623706 CASan MateoRedwood Creek - Marina2010 18050004 San Francisco Bayestablished
623666 CASan MateoRedwood Creek - Shipping2005 18050004 San Francisco Bayestablished
623704 CASan MateoRedwood Creek - Shipping2010 18050004 San Francisco Bayestablished
623690 CASan MateoSan Mateo Bridge2010 18050004 San Francisco Bayestablished
623650 CASan MateoSierra Point Marina2005 18050004 San Francisco Bayestablished

Data Disclaimer: Number of records does not imply species abundance. This summary represent collection records only and may not reflect the actual distribution of established populations. These data are preliminary or provisional and are subject to revision. They are being provided to meet the need for timely best science. The data have not received final approval by the U.S. Geological Survey (USGS) and are provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the data.

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The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2026]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [2/2/2026].

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For general information and questions about the database, contact Wesley Daniel. For problems and technical issues, contact Matthew Neilson.