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Home » Guide » Arthropods (Arthropoda) » Insects (Insecta) » Beetles (Coleoptera) » Ground and Water Beetles (Adephaga) » Ground Beetles (Carabidae) » Scaritinae » Scaritini » Scarites
Photo#163900
Scarites subterraneus vs.
Copyright © 2008 Brad Barnd

Scarites subterraneus vs. "quadriceps" - Scarites
A look at the antennal difference between Scarites subterraneus and Scarites quadriceps. (I'm not sure of the current status of S. quadriceps).

S. quadriceps has the apical antennomeres longer than wide and S. subterraneus has the apical antennomeres as wide as long. A difficult character to see in photos.
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Contributed by Brad Barnd on 4 January, 2008 - 7:25pm
Last updated 23 January, 2008 - 3:24pm

Scarites subterraneus vs quadriceps
Brad, acutually these photos show the two kinds of antennomeres quite well. Antennomere shape and body size (former less than 25 mm vs latter more than 25 mm) are about only distinguishing characteristics available in the literature for separating these two almost identical species. I have yet to find a specimen in Wisconsin that truly fits S. subterraneus even though the literature says its here. The hundreds I've seen in WI, many misidentified, all fit S. quadriceps - formerly "S. striatus". It appears that true S. subterraneus is a more southern & eastern species; not sure about westward. How about Indiana?
… Peter Messer, 16 January, 2008 - 9:36pm login or register to post comments

 
Interesting
Seems to be the opposite here in Indiana. Almost all that I have seen of Scarites fits subterraneus. So far, I have found only 4 individuals (all from Hancock Co incentral Indiana) that fit quadriceps well and the rest (~16 or so) fit subterraneus well. I have at least a couple that are in the intersection of the size range that I haven't decided on yet.
… Brad Barnd, 17 January, 2008 - 12:42am login or register to post comments

 
Finally, a convincing Scarites subterraneus in WI
from a single specimen I found 2009-V-26 in far northern Bayfield County on sandy beach of Lake Superior under driftwood. Determination was based on classic moniliform antennomeres and small body size (ABL < 20mm; elytra length < 10 mm).
… Peter Messer, 5 June, 2009 - 7:15pm login or register to post comments

 
Nice
Congrats on finding one.
… Brad Barnd, 6 June, 2009 - 8:32pm login or register to post comments

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