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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) » Leaf Beetles (Chrysomelidae) » Skeletonizing leaf beetles (Galerucinae) » Galerucini » Trirhabda » Trirhabda geminata
Photo#9457
Encelia Leaf Beetle -- larva - Trirhabda geminata
Copyright © 2004 David Scriven

Encelia Leaf Beetle -- larva - Trirhabda geminata
Lakeview Mountains, near Hemet, California, USA
December 31, 2004
Size: about 7 mm
On Brittlebush, Encelia farinosa
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Contributed by David Scriven on 3 January, 2005 - 12:54pm
Last updated 19 December, 2006 - 9:55am

Moved
Moved from Trirhabda.
… Hartmut Wisch, 16 December, 2006 - 11:29am login or register to post comments

ID
May I ask how you arrived at this ID? If it is confirmed, we could move this image to the species page.
… Hartmut Wisch, 2 December, 2006 - 2:10am login or register to post comments

 
I didn't do a detailed morpho
I didn't do a detailed morphological examination, but Trirhabda geminata is the only species of Chrysomelid that feeds on this particular host plant, Brittlebush (Encelia farinosa)-- see this abstract. Also, it fits the range and habitat description here, and is well-known in the local entomology community (U.C. Riverside). The larvae are abundant on the Brittlebushes around here in the springtime.
… David Scriven, 15 December, 2006 - 8:42pm login or register to post comments

 
Moved to species page -
I've added the reference ( a fascinating article) to the information page, including a link to the abstract.
I found an image on the internet of what seem to be larvae of T. geminata (the present image is also posted there): 1, and a photo of a Trirhabda larva gored by a predatory hemipteran (scroll down to image).
Now we just need some photos of adults.
… Hartmut Wisch, 16 December, 2006 - 11:47am login or register to post comments

 
adult
Well, the first link is to another one of my photos!

I have uploaded a photo of an adult T. geminata here.
… David Scriven, 19 December, 2006 - 9:53am login or register to post comments

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