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Beetle, dorsal, live - Thalycra

Beetle, dorsal, live - Thalycra
Jemez Mountains, Sandoval County, New Mexico, USA
September 5, 2020
Size: 5.4 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.

This specimen was difficult for me to key to family in Arnett (1), but the family description therein matches Nitidulidae with confidence. Keying it to genus ends with step 12, "Eyes with conspicuous setae", implying Aethina. One can see such eye setae in my images. However, Aethina is known to have only one (adventive) species in our area (A. tumida), which it does not resemble at all. I went up one level in BG to look at other images under Nitidulini, and found it resembles Thalycra quite well. This is what Arnett keys it to if one selects "Eyes without setae" at step 12. However, one can see eye setae very much like my specimen's in some of the better images posted on BG in that genus. I take it, then, that Arnett's key is wrong, and it is Thalycra. I took several high-resolution images to help determine genus before I came to this conclusion. Most are posted.

One needs Howden 1961 (2) (which I do not have) for species ID.

Images of this individual: tag all
Beetle, dorsal, live - Thalycra Beetle, dorsal - Thalycra Beetle, ventral - Thalycra Beetle, ventral, close - Thalycra Beetle, lateral - Thalycra Beetle, lateral, close - Thalycra Beetle, lateral, close - Thalycra