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A Guide to the Amphibians
and Reptiles of California





Thamnophis atratus intergrades






Range in California: Gold

Click the map for a guide
to the other subspecies.


Key to identifying
California gartersnakes


Range maps of
California gartersnakes





observation link



North of the San Francisco Bay, there is a very large range of intergradation between subspecies of Thamnophis atratus. The snakes in this area were formerly classified as Thamnophis atratus aquaticus (or Thamnophis couchii aquaticus.) This subspecies is no longer recognized.


 
Adult, Marin County
 
Adult, Marin County, left, with sympatric T. e. terrestris on right.
Adult, Solano County
 
Adult, Marin County
Adult, Marin County
 
Habitat
Habitat, Marin County


Habitat, Solono County
Habitat, Marin County

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