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TaxonomyBrowse
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Species Trirhabda sericotrachyla

Leaf Beetle - Trirhabda sericotrachyla Leaf Beetle - Trirhabda sericotrachyla Trirhabda on Artemisia californica - Trirhabda sericotrachyla Trirhabda on Artemisia californica - Trirhabda sericotrachyla Trirhabda sericotrachya - Trirhabda sericotrachyla - male Trirhabda? - Trirhabda sericotrachyla Leaf Beetle - Trirhabda sericotrachyla Leaf Beetle - Trirhabda sericotrachyla
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 sericotrachyla (Trirhabda sericotrachyla)
Explanation of Names
Trirhabda sericotrachyla (Blake 1931)
sericotrachyla = 'silken neck', a reference to pronotal pubescence
Size
Body Length: 6.8-8 mm per Blake(1931); 6.0-9.0 mm per Hogue(1)(1970)
Identification
T. sericotrachyla is easily confused with T. luteocincta...below they're contrasted side-by-side:
Pronotal spot typically piceous in sericotrachyla vs. with metallic-green luster in luteocincta (though both Blake(1931) and Hogue(1970) indicated T. sericotrachyla's pronotal spots also have metallic-green luster)
        T. sericotrachyla     T. luteocincta
Pronotal sheen dull in sericotrachyla vs. shiny in luteocincta
Venter of abdomen pale medially, piceous laterally in sericotrachyla vs. entirely piceous or green in luteocincta
        T. sericotrachyla     T. luteocincta
Size: luteocincta is appreciably larger in size than sericotrachyla
        T. luteocincta on left T. sericotrachyla on right
Food
Host plant in California sage (Artemisia californica).
See Also
T. luteocincta has often also had Artemisia californica attributed as its host plant...but O'Brien & Atsatt (1982) compellingly suggested its main host is more likely "Haplopappus venetus ssp. vernonioides" = Isocoma menziesii instead, which is more consistent with BG records.
Print References
Blake, D.H. (1931). Revision of the species of beetles of the genus Trirhabda north of Mexico. Proceedings of the United States National Museum 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.(1)
O'Brien P.Y., Atsatt P.R. (1982) Life history and general bionomics of Trirhabda sericotrachyla Blake (Coleoptera: Chrysomelidae) in southern California. Pan-Pacific Entomologist 58: 139-152. (Full Text)
Works Cited
1.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.