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Sunnyside Park, Surrey, British Columbia, Canada
October 14, 2011
Size: .3 mm
I found two specimen on a Calocera cornea fungus, one near the bottom writhing in concert with a nematode?, which was just out of reach on the slimy decaying log, and this smaller specimen at the tip waving its front appendages in the air. The body is .2 mm long, .3 mm including the front appendages. I came across them by luck, intending to explore the fungus with a magnifying attachment when I noticed the movement of the lower specimen. I do not know if they are the same species or what the relationship is with the worm. I also took video of the dance. Stack of three focus bracketed images with CombineZP.

Found with:

Images of this individual: tag all
mite mite, front view

Moved from Acaridae.

Moved from Acaridia.

Moved from Mites and Ticks.


Moved for expert attention
Moved from ID Request.

Am I reading your remarks correctly? It seems that these images represent two different mites--one at the tip of the fungus (maybe the first two images?) and one further down (the last image?). If that's the case, the two should be unlinked and cross-referenced with thumbnails. Linking is reserved for images of the same individual.

I can take care of that for you if you'll confirm which images are which.

Thanks--and welcome to BugGuide!

Yes, and thank-you for your help. The first two at the tip are one individual and the last one at the base is a separate individual.

I'll do better next time.

Not a problem :)
It's been taken care of. With luck, the experts will be able to place these.

Might be a hypopus (a type of
Might be a hypopus (a type of larval or nymph stage. Not sure which).

That sounds like a very good explanation. The distal portion of the front appendage resembles a hook in any of the images that I took and it certainly is posturing as though to hitch a ride. The scale of the image is at the absolute limit of resolving any meaningful detail.

I might be wrong. Wait for an expert, but I think hypopi are associated with members of the order Astigmata.
Now that I look through the photos, it seems more likely this is a uropodid mesostigmata mite.

Deutonymph (hypopus) of Histiostomatidae
I'm leaning towards the specimen being a deutonymph (hypopus) of Histiostomatidae. My imagination was running with the idea of large hooks on the waving appendage but they do have small claws (of course) with which to hitch a ride.

Not Histiostomatidae but Acaridae. Several genera have species that are specialists in fungal fruiting bodies, e.g. Mezorhizoglyphus, which these photos resemble.

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