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Home » Guide » Arthropods (Arthropoda) » Insects (Insecta) » Beetles (Coleoptera) » Water, Rove, Scarab, Longhorn, Leaf and Snout Beetles (Polyphaga) » Long-horned and Leaf Beetles (Chrysomeloidea) » Longhorned Beetles (Cerambycidae) » Flat-Faced Longhorns (Lamiinae) » Moneilemini » Cactus Long-horned Beetles (Moneilema) » Moneilema armatum
Photo#231111
Cactus longhorn - Moneilema armatum
Copyright © 2008 Charley Eiseman

Cactus longhorn - Moneilema armatum
Big Bend National Park, Texas, USA
July 15, 2008
I just summarized on the Moneilema page the obvious differences I was able to glean among the six species, and from that information it seems like this is probably Moneilema armatum, but I can't rule out M. annulata since we have no information on that species.

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Cactus longhorn - Moneilema armatum Cactus longhorn - Moneilema armatum
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Contributed by Charley Eiseman on 4 October, 2008 - 9:40pm
Last updated 12 October, 2008 - 11:23pm

Moved
Moved from Cactus Long-horned Beetles.
Thanks Ted--I've incorporated your comments into my attempt at a key on the guide page. Please let me know if there's anything incorrect there.
… Charley Eiseman, 12 October, 2008 - 11:23pm login or register to post comments

 
Looks good...
Another character that separates annulatum and appressum from the other species is the internally produced antennal scape (small inward-facing spur at the apex). Distribution can also be used in a few cases to narrow the choices - blapsides occurs only in southcentral Texas (and south into Mexico), and armatum occurs in more easterly areas of the southwest while semipunctatum is in the more westerly areas of same (the two species are largely allopatric).
… Ted C. MacRae, 13 October, 2008 - 11:37am login or register to post comments

The small pronotal spines...
...(visible in other photo) rule out Moneilema annulatum, which has them reduced to flat tubercles (as well as the labrum abruptly bicolorous). Both gigas and armatum can have the 4th antennomere annulate, but gigas has much larger pronotal spines (at least as long as 9th antennomere). The small size of those spines suggest this is armatum.
… Ted C. MacRae, 12 October, 2008 - 11:01pm login or register to post comments

Moved
Moved from Beetles.
… Eric R. Eaton, 6 October, 2008 - 1:28am login or register to post comments

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