There should really be only one freshwater turtle in California. However, many other turtles from the eastern US and elswhere end up in California, typically originating as pets, but end up in the wild. These resources may help ID some turtles that are otherwise rarely seen in California.
Peterson Field Guide
Conant and Collins. 1998. A field guide to reptiles and amphibians, eastern and central North America, 3rd edition (Peterson Field Guide Series). GoogleBooks (plates only, no species accounts): https://books.google.com/books?id=32Rm7c-v_McC&newbks=1&newbks_redir=0&lpg=PP1&dq=fieldguide%20to%20eastern%20reptiles%20and%20amphibians&pg=PA40#v=onepage&q&f=true
Examples:
Western pond turtle (Clemmys [~ Emys, Actinemys] marmorata) https://turtles.linnaeus.naturalis.nl/linnaeus_ng/app/views/species/taxon.php?id=8095
Common slider (Trachemys scripta) https://turtles.linnaeus.naturalis.nl/linnaeus_ng/app/views/species/taxon.php?id=8103&epi=11
Painted turtle (Chrysemys picta) https://turtles.linnaeus.naturalis.nl/linnaeus_ng/app/views/species/taxon.php?id=8102&epi=11
Trachemys, https://repositories.lib.utexas.edu/handle/2152/45343
Trachemys scripta, https://repositories.lib.utexas.edu/handle/2152/45332
Clemmys marmorata (aka WPT), https://repositories.lib.utexas.edu/handle/2152/45027
Chrysemys, https://repositories.lib.utexas.edu/handle/2152/45335 (taxonomy may be old)
Pseudemys, https://repositories.lib.utexas.edu/handle/2152/45310 (taxonomy may be old)
Comentarios
Thanks, Brian.
Sweet!
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