Derobrachus brevicollis - Derobrachus thomasi

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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Beetles (Coleoptera) » Polyphaga » Series Cucujiformia » Longhorn and Leaf Beetles (Chrysomeloidea) » Longhorn Beetles (Cerambycidae) » Prioninae » Prionini » Derobrachus » Thomas's Oak Borer (Derobrachus thomasi)

Photo#19355

Copyright © 2005 Brian E Womble

Derobrachus brevicollis - Derobrachus thomasi -

Naples (Golden Gate Estates), Collier County, Florida, USA
June 4, 2005
Size: Approx. 2 inches

Final Edit.

I frassed previous images of this beetle and am working on better quality images (Re: color balance, contrast, etc.) The images I had on here previously will be re-uploaded in short order.

Mr. Harpootlian had some reservations on the ID of this specimen (copy-pasted below). Hopefully the newly uploaded images will help. Thanks to everyone for their help and patience!

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??
This doesn't look like Orthosoma to me - they are very parallel sided and the pronotal spines are less obvious - see the other posted pics. Any chance of getting any more photos?
… Phillip Harpootlian, 6 June, 2005 - 11:17am

Images of this individual: tag all

Derobrachus brevicollis - Derobrachus thomasi - male

tag · login or register to post comments

Contributed by Brian E Womble on 7 June, 2005 - 8:55am
Last updated 6 August, 2008 - 2:50pm

Moved

Moved from Bahiagrass borer.

… Phillip Harpootlian, 6 August, 2008 - 2:51pm

Prionid, but not brown:-)

This is not Orthosoma, but possibly Derobrachus sp. It certainly reminds me a great deal of our own local Tucson species in that genus. Florida specimens would be D. brevicollis, but apparently none have been seen in some time. I'd send your images (or the specimen if you have it) to the Florida State Collection of Arthropods in Gainesville and see what they say.

… Eric R. Eaton, 7 June, 2005 - 11:35am

Thanks Eric

I have been on the Uof F Cerambycid site, and was going to postulate that MAYBE this is Derobrachus brevicollis. But the spines alongside the thorax seem to be WAY more pronounced in the specimen they have in the online display.

We'll see.

I really want to settle this. I feel sort of goofy for having fits over it, but what can I do? I'm is dedicated. I'm sure y'all can relate.

Come visit us at the homestead. All are welcome!

… Brian E Womble, 7 June, 2005 - 11:44am

Derobrachus brevicollis

I see you scared up some additional photos. They nail it – this is definitely Derobrachus brevicollis. This species is quite variable, ranging in length from 32-70 mm!! The following key (adapted from Linsley) should help;

Antennomere 3 distinctly longer than 1 and 2,
about as long as 4 and 5 together (left) ......... Derobrachus

Antennomere 3 equal in length to 1 and 2,
shorter than 4 and 5 (right) ............................. Orthosoma

1962. Linsley E.G. The Cerambycidae of North America. Part II. Taxonomy and classification of the Parandrinae, Prioninae, Spondylinae and Aseminae. Univ. Calif. Publ. Entomol., 19:1-102, 1 pl., 34 figs.

Evidently a pest of Peanuts and Bahiagrass (a Brazillian import popular in pastures and now lawns as well). Many references are also available on the web under the common name Bahiagrass or Bahia grass borer, including larva.

1968. Tippins, H.H. Biology of Derobrachus brevicollis, a pest of bahiagrass and peanuts. Research bulletin, University of Georgia, College of Agriculture Experiment Stations. 18 pp.

Addendum 6/20/05
I had a chance to compare your photos to some SC specimans as well as the excellent photos in Chemsak's revision (all species illustrated, male and female) - excellent match. Yours is a male. The speciman from the Florida website appears to be atypical. Chemsak had a slightly different take on this - besides the requisite eleven antennomeres, the males should usually have small spines on the elytral apices, range: AL, FL to NC and finally size: males 28-43mm, females 31-65mm.

1996. Chemsak, A.J. Illustrated Revision of the Cerambycidae of North America. Vol. I, Subfamilies Parandrinae, Spondylidinae, Aseminae, Prioninae. Wolfsgarden Press, Burbank, ix+150pp., 10 pls.

… Phillip Harpootlian, 16 June, 2005 - 7:22am

Derobrachus brevicollis

we have these beetles in our yard but we don't live in a wet climate. i live in southeast New Mexico and have never seen them before. please tell me what to do about them. the one that we killed was a female. we also had a male that died in our kitchen. I need your help!!!!

… starlight1974200, 26 September, 2005 - 6:06pm

new image

you don't have to frass the old image and resubmit new images. You can actually just EDIT your initial submission and paste the new image in place of the old image. Try it, you'll like it. Works like a charm.

… john and jane balaban, 7 June, 2005 - 11:19am

Thank you...

I guess I'll be making newbie errors for a while...

I was having fits, too what with the frassing and all. I don't like that there are "frassed" images in my profile/"view images submitted by..." page. Any way I can delete those completely from the record, or do I have to wait for the full 30 days?

Newbie newbie newbie.

Come visit us at the homestead. All are welcome!

… Brian E Womble, 7 June, 2005 - 11:40am

Thirty days will pass in no time

But, yes, you can delete your own images. Just edit them and there should be a delete button.

… Troy Bartlett, 7 June, 2005 - 10:45pm

Oh GAWD - Duu-uh.

It's so frustrating to be obsessive AND unable to ferret out a simple solution like that one. Sheesh.

Okay - moving on...

Thanks, Troy.

Sheesh!

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Come visit us at the homestead. All are welcome!

… Brian E Womble, 8 June, 2005 - 9:26am

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