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Lasiocampa cf. trifolii
The grass eggar caterpillars live primarily on grasses, but also on Ericaceae. Especially older caterpillars feed also on Fabaceae and other plants. The scattered deposited eggs overwinter on the ground, the larvae hatch in late March or in April. They are fully-grown in June and spin their cocoons mostly in the litter layer. The moth emerges after a quite long pupal phase of 6-8 weeks in August or early September, only rarely at the end of July.
Lasiocampa trifolii colonizes nutrient-poor, at least partially low growing, mostly grazed and rather dry grasslands like limestone grassland, heathlands, steppe-like slopes or sandy regions. Lasiocampa trifolii has a high area requirement.
I am not quite certain if this is the right ID for this caterpillar. So please feel free to correct me if you think this a different species. Spotted on a heathland, Hulshosterheide, Veluwe, Holland. (sources:see reference)
Spotted on May 23, 2020
Submitted on Sep 27, 2020