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Photo#758511
Acari - Phoretic mite on the leg of Pterostichus tristis - Polyaspis

Acari - Phoretic mite on the leg of Pterostichus tristis - Polyaspis
Mont St-Hilaire, Montérégie County, Quebec, Canada
These phoretic mites are pretty common on several species of ground beetles (here on a Pterostichus tristis), and I'm curious to know who they are.

Date
Do you have the collection date?

 
Unfortunatly, I've take this
Unfortunatly, I've take this picture some months ego, and I forget to put the date in the name of the picture as I usually do. However, I will add another picture of another specimen of this genus for which I have the collection date.

Moved
Moved from ID Request.

New family for the Guide. Very cool!

This looks like a phoretic de
This looks like a phoretic deutonymph in the genus Polyaspis (family Polyaspididae). As members of the Uropodina, they attach via a secreted anal pedicel. These mites are normally found in decaying wood (old logs, tree holes, etc.).

 
Thanks for the identification
Thanks for the identification! One more personal mystery resolved! I'm surprized that it is the first picture for this family; they seem pretty common to me. Or I just found a hot spot for them... Anyway, I'll add other pictures.

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