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Beetle with mites, dorsal - Corticeus praetermissus

Beetle with mites, dorsal - Corticeus praetermissus
Jemez Mountains, Sandoval County, New Mexico, USA
September 5, 2020
Size: 3.8 mm Body Length
Download high resolution image here.

This subject came to a mercury vapor lamp set-up at 35°48'49.0"N 106°40'58.0"W, 7339 ft elevation, Jemez Springs 7.5' quadrangle, near a cabin on Spruce Loop, Sandoval Co., NM. Many other images from this event are posted. I collected representative specimens of most, and can follow up with high resolution images of selected ones if needed. Size is determined from the sheet it's on having 80 by 100 threads per inch.

One sees in this image a phoretic uropodid mite attached to the beetle's left thorax. Detailed views of it are posted in Uropoidae:

One also sees several much smaller phoretic Histiostoma sp. scattered about on its body. I also post detailed views of this genus, but on a different host:

These mites were washed off and lost for the linked views of the air mounted specimen. Finally, there is a prostig on the sheet to the right of the beetle. It is not attached, though. It may have jumped off, or it may simply have been attracted to the light and has nothing to do with the beetle. I have observed mites in the family Adamystidae, which this one resembles, active in full sun:

Images of this individual: tag all
Beetle with mites, dorsal - Corticeus praetermissus Beetle with mites, dorsal, mounted - Corticeus praetermissus Beetle with mites, ventral, mounted - Corticeus praetermissus

Moved from Corticeus substriatus.

Given additional high resolution mounted views, it keys to C. praetermissus in Triplehorn 1990(1). It may be separated from C. substriatus specifically early in the key (step 5) by its obtuse apical pronotal angles. Compare the dorsal views of the two species in this reference to my dorsal view regarding this.
"Diagnosis. This species may be recognized easily by the alutaceous, finely and sparsely punctured abdominal sterna, the obtuse apical pronotal angles, narrowly margined pronotum, and very finely punctured frons."

Moved tentatively; must be not too hard to key out
Moved from Corticeus.

Moved from ID Request.

I'll follow-up shortly with a high resolution dorsal and ventral view of the collected specimen. That should take it to species with Triplehorn's key(1).

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