Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada

Species Trirhabda diducta

Trirhabda sp. (perhaps T. diducta?) - Trirhabda diducta Trirhabda sp. (perhaps T. diducta?) - Trirhabda diducta Trirhabda diducta? - Trirhabda diducta Trirhabda species? - Trirhabda diducta Beetle - Trirhabda diducta Trirhabda diducta? - Trirhabda diducta
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga (Water, Rove, Scarab, Long-horned, Leaf and Snout Beetles)
No Taxon (Series Cucujiformia)
Superfamily Chrysomeloidea (Long-horned and Leaf Beetles)
Family Chrysomelidae (Leaf Beetles)
Subfamily Galerucinae (Skeletonizing Leaf Beetles and Flea Beetles)
Tribe Galerucini
No Taxon (Section Coelomerites)
Genus Trirhabda
Species diducta (Trirhabda diducta)
Identification
Compared to T. eriodictyonis (the only other Trirhabda species with Eriodictyon as host plant), the elytra of T. diducta typically have wider, well-defined sutural vittae. Also, the three pronotal spots, as well as the central occipital (top of head) spot, are noticeably larger on T. diducta than on T. eriodictyonis.
[See figs.13-14 and key couplets 17-20 from Blake (1931)]
Range
CA and adjoining parts of s. NV and s OR.(1)(2)
Food
Recorded host plants restricted to the genus Eriodictyon: E. californicum, E. crassifolium, E. tomentosum.
Print References
Blake D.H. (1931) Revision of the species of beetles of the genus Trirhabda north of Mexico. Proc. U.S. Nat. Mus. 79(2):1-36 (Full text)
Hogue S.M. (1970) Biosystematics of the genus Trirhabda LeConte of America north of Mexico (Chrysomelidae: Coleoptera). Ph.D. dissertation, University of Idaho, 212 pp.(3) (The most complete reference to date.)
N. D. Johnson, S. A. Brain and P. R. Ehrlich (1985). "The Role of Leaf Resin in the Interaction between Eriodictyon californicum (Hydrophyllaceae) and Its Herbivore, Trirhabda diducta (Chrysomelidae)", Oecologia, Vol. 66, No. 1 (1985), pp. 106-110. (1st page via JSTOR).
Internet References
Type specimen images from the MCZ.
Works Cited
1.A Synopsis of the North American Galerucinae (Coleoptera: Chrysomelidae)
John A. Wilcox. 1965. New York State Museum and Science Service.
2.Phylogeny and host plant association in the leaf beetle genus Trirhabda LeConte (Coleoptera: Chrysomelidae)
Swigoňová Z., Kjer K.M. 2004. Mol. Phylogenet. Evol. 32: 358-374.
3.Biosystematics of the genus Trirhabda LeConte of America north of Mexico (Chrysomelidae: Coleoptera)
Steve Munroe Hogue. 1970. Ph.D. dissertation, University of Idaho, 212 pp.