Specimen Information

Didemnum vexillum
Didemnum vexillum
(a colonial sea squirt)
Tunicates
Exotic

Specimen ID160963
GroupTunicates
GenusDidemnum
Speciesvexillum
Common Namea colonial sea squirt
StateCA
CountyMarin
LocalitySausalito, dock at a marina
Mapping AccuracyAccurate
HUC8 NameSan Pablo Bay
HUC8 Number18050002
HUC10 NameSan Francisco Bay
HUC10 Number1805000210
HUC12 NameRichardson Bay-San Francisco Bay
HUC12 Number180500021002
Map
Collection Day28
Collection Month5
Collection Year2003
Year AccuracyActual
Potential Pathwayshipping
Statusestablished
Reference 1
Ref. Number:24155
Author:USGS - Woods Hole Science Center.
Date:2004
Title:Marine Nuisance Species, Didemnum vexillum, a colonial tunicate; ascidian; sea squirt - California coastal locations.
CommentsSubstrate, rope.
Record TypeLiterature
Freshwater/MarineMarine


Disclaimer:

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].

Contact us if you are using data from this site for a publication to make sure the data are being used appropriately and for potential co-authorship if warranted.

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