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Species Trirhabda flavolimbata

Trirhabda flavolimbata on Host Plant - Trirhabda flavolimbata Trirhabda flavolimbata? - Trirhabda flavolimbata More Trirhabda flavolimbata larvae - Trirhabda flavolimbata Trirhabda flavolimbata feeding on B. douglasii - Trirhabda flavolimbata Green and yellow beetle - Trirhabda flavolimbata Trirhabda larvae on Coyote Brush - Trirhabda flavolimbata unknown beetle on poison oak fruit - Trirhabda flavolimbata Coyote Brush Leaf Beetle - Trirhabda flavolimbata - Trirhabda flavolimbata
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 (Longhorn and Leaf Beetles)
Family Chrysomelidae (Leaf Beetles)
Subfamily Galerucinae (Skeletonizing Leaf Beetles and Flea Beetles)
Tribe Galerucini
No Taxon (Section Coelomerites)
Genus Trirhabda
Species flavolimbata (Trirhabda flavolimbata)
Synonyms and other taxonomic changes
Galleruca flavolimbata Mannerheim, 1843   [Orig. Comb., description at BHL]
Trirhabda flavolimbata LeConte, 1865   [New Comb., description at BHL]
Explanation of Names
flavolimbata - Latin for 'yellow edged' (1)
5-8mm (2)
Coastal CA -- San Francisco region (3)
The primary host of T. flavolimbata is clearly Baccharis pilularis. Palmer (1986) noted that:
"Although T. flavolimbata has been reported on a number of possible host plants other than B. pilularis, such as Aster, Solidago, Artemesia, Senecio and Eriodictyon (Essig 1929; Blake 1931; Tilden 1953), it is not entirely clear whether feeding was rigorously verified and the citations were prior to the taxonomic revision of the genus by Hogue(4) (1970) who considered B. pilularis to be the only host."
However, T. flavolimbata has been photographed feeding on B. douglasii, and seen and collected on Aster chilensis (cf. pg. 152 of Palmer...and this BG post).
Life Cycle
See: Tilden (1953).
See Also
T. labrata is a "look-alike" which even shares the same host plant: Baccharis pilularis.

There are also 4 other CA species of Trirhabda that might easily be mistaken for T. flavolimbata. They are:
  T. luteocincta and T. sericotrachlya...which share Artemisia californica as their host plant; and
  T. confusa and T. manisi...which share Ericameria (Chrysothamnus) nauseosa as their host plant.
The above species occur are principally the east of the Sierra Nevada-Cascades mountain ranges both T. pubicollis and (the non-vittate form of) T. convergens can also be mistaken for T. flavolimbata...and there may be others!
Print References
Tilden, J.W. 1953. Biological Notes on Trirhabda flavolimbata (Chrysomelidae). The Coleopterists Bulletin, 7(3): 20-23. (Full Text).
Palmer, W.A. 1986. The Host Range of Trirhabda flavolimbata (Mannerheim) (Coleoptera: Chrysomelidae) and Its Suitability as a Biological Control Agent for Baccharis Spp. (Asteraceae: Astereae). The Coleopterists Bulletin 40(2): 149-153. (JSTOR)
Internet References
Type specimen images from the Museum of Comparative Zoology, Harvard University. (Somewhat discolored...more than 175 yrs old!)
Works Cited
1.Dictionary of Word Roots and Combining Forms
Donald J. Borror. 1960. Mayfield Publishing Company.
2.A Synopsis of the North American Galerucinae (Coleoptera: Chrysomelidae)
John A. Wilcox. 1965. New York State Museum and Science Service.
3.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.
4.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.