Tymnes oregonensis
(Crotch, 1873)
Oregon Leaf Beetle
Tymnes oregonensis is a of leaf beetle in the Chrysomelidae, tribe Alticini. It is native to western North America. The species was originally described by Crotch in 1873 and has been historically treated under the Phyllotreta as a synonym. Available records indicate presence in the Canadian provinces of Alberta and Manitoba, with broader distribution across North America. Like other members of the Alticini, it possesses enlarged hind adapted for jumping.
Pronunciation
How to pronounce Tymnes oregonensis: //ˈtaɪmnɛs ˌɔːrɪɡəˈnɛnsɪs//
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Identification
As a member of the flea beetle tribe Alticini, Tymnes oregonensis can be distinguished from non-flea beetle chrysomelids by its enlarged hind with thickened hind legs adapted for jumping. Within the Tymnes, specific identification requires examination of subtle morphological characters including antennal proportions, elytral punctation patterns, and male genitalia. The may be confused with Phyllotreta species, from which it was historically separated; Tymnes typically has shorter relative to body length and different pronotal proportions compared to Phyllotreta.
Distribution
Recorded from North America with specific locality data from Alberta and Manitoba, Canada. The epithet suggests historical collection from Oregon region. Distribution records are sparse; the species appears to be undercollected relative to more economically important flea beetles.
Similar Taxa
- Phyllotreta speciesHistorically treated as congeneric; Phyllotreta are distinguished by longer and different pronotal shape. Many Phyllotreta are economically important crop pests, whereas Tymnes species are not known agricultural pests.
- Other Tymnes speciesWithin the , -level identification requires detailed examination of male genitalia and subtle external morphological characters; the genus Tymnes contains relatively few described species in North America.
More Details
Taxonomic History
The has undergone taxonomic revision, previously placed in Phyllotreta and now recognized in Tymnes. GBIF currently lists it as a synonym of Phyllotreta oregonensis, though iNaturalist and other sources maintain it under Tymnes, reflecting ongoing taxonomic uncertainty or differences in classification systems between databases.
Data Limitations
This is poorly represented in entomological collections and literature. The four iNaturalist observations suggest it is rarely encountered or underreported. Most available information comes from taxonomic databases rather than ecological or biological studies.