Periphyllus hirticornis aestivating larva

A peculiarity of the genus Periphyllus is that first instar larvae may be born in an aestivating state. Most setae then are widened fan-like (picture taken from Stroyan, 1977a).

Periphyllus acericola: aestivating larvae on Acer pseudoplatanus

The larvae then sit in compact groups on the leaves, giving from from a distance the impression of white spots (France, Paris © Pierre Duhem

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