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This genus contains three small bugs (<5 mm) which are often found on umbellifers (Apiaceae). They generally have dark antennae. Although external characters are useful, some specimens cannot be reliably identified without dissection.
O. basalis is never green or green-tinged like O. campestris and is larger, more elongate and often more extensively dark-marked. Males often show three pale spots on the scutellum, as shown here. Although very similar to O. kalmii, the 3rd antennal segment is relatively long, only slightly less than the head width.
Locally distributed across the UK on umbellifers.
Adult: All year
Length ~5 mm
|Adult male: Jersey (August 2008) ©Tim Ransom
|Adult male: Dorset (August 2009) ©Tristan Bantock
||Adult male: Jersey (August 2008) ©Tim Ransom
|Adult female: Cumbria (April 2009) ©Peter Bolson
||Adult female: Dorset (August 2009) ©Tristan Bantock