Timarcha latreille

Definition

The genus of leaf beetles (family Chrysomelidae, subfamily Chrysomelinae) established by Pierre André Latreille in 1829. Timarcha species are primarily Palaearctic in distribution and are notable for their flightless condition, fused elytra, and often striking metallic coloration. Many species are associated with Rubiaceae host plants.

Etymology

Named by Pierre André Latreille in 1829; the generic name Timarcha derives from Greek elements (timē 'honor' + archos 'ruler' or similar compound), though the exact etymological intent is not definitively established in the source context.

Example

Timarcha tenebricosa, the bloody-nosed beetle, is a familiar European species within Timarcha latreille that defends itself by reflex bleeding of orange-red hemolymph from mouth and leg joints when disturbed.

Related Terms

• Chrysomelidae
• Chrysomelinae
• Palaearctic
• flightlessness
• Elytra
• Latreille

Usage Notes

The epithet 'latreille' in this context refers to the author and date of the genus description (Timarcha Latreille, 1829), following standard zoological nomenclature conventions. In formal taxonomic usage, the genus is cited as Timarcha Latreille, 1829 or simply Timarcha. The genus is sometimes divided into subgenera including Timarcha s. str. and Metallotimarcha, though subgeneric classification varies among authors.