quadrigemina/hyperici species group

Classification · Identification · Internet References

Klamath Weed Beetle - Chrysolina quadrigemina

Classification

Kingdom Animalia (Animals)

Phylum Arthropoda (Arthropods)

Class Insecta (Insects)

Order Coleoptera (Beetles)

Suborder Polyphaga (Water, Rove, Scarab, Longhorn, Leaf and Snout Beetles)

Superfamily Chrysomeloidea (Long-horned and Leaf Beetles)

Family Chrysomelidae (Leaf Beetles)

Subfamily Chrysomelinae

Tribe Chrysomelini

Subtribe Doryphorina

Genus Chrysolina

No Taxon quadrigemina/hyperici species group

Identification

There are two European species naturalized for control of the weed St.John's-wort (Hypericum perforatum), and you need male genitalia to separate them with certainty. C. quadrigemina seems to be the dominant sp. in N. America, though, and in it, both sexes are very brillant dorsally, while in C. hyperici, females are a bit opaque. … Boris Büche, 4 September, 2007

Chrysolina quadrigemina males have the apical ventral segment broadly and very distinctly impressed and the beetles are 6.0 to 7.1mm long. Chrysolina hyperici has the apical ventral segment not distinctly impressed and is 5.3 to 6.1mm long. Most specimens of Chrysolina I've collected on St.John's Wort have been C. quadrigemina. … John R. Watts, 22 July, 2008

Internet References

Fact sheet

Contributed by john and jane balaban on 9 July, 2008 - 10:03pm
Additional contributions by Beatriz Moisset, v belov
Last updated 3 July, 2011 - 1:28pm

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