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Tylobolus sp. from California - Tylobolus

Tylobolus sp. from California - Tylobolus
Ripon, San Joaquin County, California, USA
April 23, 2016
Several of these milipedes were collected for me near oak trees in the region specified. I know they are Tylobolus, but what species? The only Tylobolus species listed here is T. uncigerus, which are grayer in color without the reddish margins common to specimens found in California.

Thank you!

Tylobolus castaneus
Based on the range, I believe these can only only be Tylobolus castaneus -- unless there are forms of T. uncigerus with red margins or these two are able to cross where they are sympatric?

Moved from Millipedes.


Moved from ID Request.

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