Specimen Information

Dreissena polymorpha
Dreissena polymorpha
(zebra mussel)
Mollusks-Bivalves
Exotic
Collection Info
Point Map
Species Profile
Animated Map
Impacts

Specimen ID1651256
GroupMollusks-Bivalves
GenusDreissena
Speciespolymorpha
Common Namezebra mussel
StateTX
CountyWilliamson
LocalitySan Gabriel River in the San Gabriel Park, Georgetown
Mapping AccuracyAccurate
HUC8 NameSan Gabriel
HUC8 Number12070205
HUC10 NameGranger Lake-San Gabriel River
HUC10 Number1207020505
HUC12 NameSmith Branch-San Gabriel River
HUC12 Number120702050501
Map
Collection Day8
Collection Month6
Collection Year2020
Year AccuracyActual
Potential Pathwaydispersed | hitch hiker on small watercraft
Statusunknown
Record TypeNAS sighting report
VerifierUSGS NAS Program Staff
Freshwater/MarineFreshwater
Number Collected5
Photo
Dreissena polymorpha

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. [2025]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [12/17/2025].

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.