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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Beetles (Coleoptera) » Polyphaga » Series Elateriformia » Elateroidea » Small False Click Beetles (Throscidae) » Trixagus » Trixagus carinicollis
Photo#478126
another Trixagus - Trixagus carinicollis
Copyright © 2010 Tim Moyer

another Trixagus - Trixagus carinicollis
Medford, (~25 miles east of Philadelphia, PA) Burlington County, New Jersey, USA
May 22, 2010
Size: 2.4mm
this one doesn't seem to have the lateral setae (I might have "erased" them with poor focus bracketing), but to me it also doesn't appear widest at the base as the other Trixagus sp. is described in D&A.

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another Trixagus - Trixagus carinicollis another Trixagus - Trixagus carinicollis another Trixagus - Trixagus carinicollis
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Contributed by Tim Moyer on 8 December, 2010 - 11:54pm
Last updated 6 July, 2011 - 11:07am

Moved
Moved from Trixagus.

I believe Christopher's original diagnosis was correct. Wouldn't get too hung up on eye facets, the two species that have smaller eyes are western/southwestern in distribution.
… Blaine Mathison, 6 July, 2011 - 11:07am login or register to post comments

Moved back -- i think i jumped the gun
looks like ?she has ~70 facets in the anterior lobe...

Moved from Trixagus carinicollis.
… v belov, 9 December, 2010 - 9:44am login or register to post comments

 
yes,
I didn't finsh counting but also thought it wasn't going to sum up higher than 90.

Still, I get lots of these (some nights), but have never made the effort to tell them apart. Excluding the (males) ones with the lateral setae will at least cut the field in half.
… Tim Moyer, 9 December, 2010 - 3:58pm login or register to post comments

 
at my patio lights, those constitute the most abundant beetle species throughout much of the summer
… v belov, 9 December, 2010 - 4:18pm login or register to post comments

Moved
Moved from Trixagus.
… v belov, 9 December, 2010 - 9:40am login or register to post comments

Trixagus species
Indeed, the lateral setae are not visible on this specimen. Only males of T. chevrolati exhibit this feature; females do not. Based on the undulation of the base of the pronotum of this specimen, it looks to be T. carinicollis instead (male or female). The precise method to distinguish between these two species is by counting the eye facets in the anterior lobe of the eye. In T. carinicollis these range from 94-130 (mean of 99.2), whereas in T. chevrolatithey range from 49-92 (mean 62.5). This information is from: Yensen, E. 1975. A revision of the North American species of Trixagus Kugelann (Coleoptera: Throscidae). Transaction of the American Entomological Society 101: 125-166. which is the definitive treatment of this genus.
… Christopher Majka, 9 December, 2010 - 9:34am login or register to post comments

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