California Reptiles & Amphibians
Thamnophis atratus intergrades
Click on a picture for a larger view
Range in California: GoldClick the map for a guide
to the other subspecies.
Key to identifying
California gartersnakes
Range maps of
California gartersnakes
North of the San Francisco Bay, there is a very large intergrade range between T. a. hydrophilus and T. a. atratus or T. a. zaxanthus. The snakes in this area were formerly named T. a. aquaticus (or T. couchii aquaticus.) This subspecies is no longer recognized. |
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Adult, Marin County |
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Adult, Marin County, left, with sympatric T. e. terrestris on right. |
Adult, Solano County |
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Adult, Marin County |
Adult, Marin County |
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Habitat, Marin County |
Habitat, Solono County | Habitat, Marin County |
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