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Added: 30th October 2012 Description:
Large caterpillar c50mm long found on ground after conifer hedge and honeysuckle had been pruned. It has a distinctive black triangle on its back just behind its head. Arrangement of legs etc. as of the Geometrid moths.
Confidence: It's likely to be this, but I can't be certain. Notes: Photos offer a dorsal view only, the face and undercarriage immediately infront of the rear feet would help confirm as this species- there are 4 tiny remnant prolegs on the underside just infront of the rear feet. It looks right for Scalloped Hazel over several similar larva- the dark triangular shape is visible on the ukleps examples but not just as clear as on yours and some specimens I have seen recently. At 5cm it would be a large final instar, I havent measured any over 4.5cm yet but its very possible. UKleps gives 4.5cm as the upper limit. The green markings match specimens I have seen but the feature isn't well represented in ukleps- it is a very variable larva.
No interactions present.
Other observations of Scalloped Hazel ( Odontopera bidentata) Species with which
Scalloped Hazel ( interacts Odontopera bidentata)