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Added: 24th January 2011 Description:
This has been sat in my unknown folder for quite a while now. Similar in size to Common White Wave, but the pink tinged markings and the small circular dots on the forewings are very puzzling. I am now leaning towards one of the larger micro species as I cannot find a match in Waring and Townsend. Any help in identifying this would be much appreciated
Confidence: It's likely to be this, but I can't be certain. Notes: The wavy outer cross line is a diagnostic feature in this very variable species.
Also the you spotted this right in the middle of its flight season.
Confidence: It's likely to be this, but I can't be certain. Notes: This seems to be a possibility. It is a geometrid rather than a large micro (which could only point to one of the pyralids) The overall size, as suggested by your comparison species, and the wing shape are right for Riband Wave, although the posture of the upper wings is not especially typical or at least isn't shown in pictures. However, the general demeanour of the pairs of wings and the exposed body and anal tuft also support RB. The spot isn't atypical of this (horribly) varied species, which just leaves the slight(!) problem of the cross-lines. Have a look at http://www.ispot.org.uk/node/58693
where there is a Riband Wave with cross-lines which approach your specimen in terms of zigzaggyness.
Confidence: It's likely to be this, but I can't be certain. Notes: compared to aversata cross lines more wavy, outer crossline less angled near costa, abdomen slightly longer
No interactions present.
Other observations of Small Fan-footed Wave ( Idaea biselata) Species with which
Small Fan-footed Wave ( interacts Idaea biselata)