Polyploca ridens (Fabricius, 1787)


Polyploca ridens: Adult (e.l. eastern Swabian Alb, Southern Germany) [S] Polyploca ridens: Half-grown larva (Northern Greece, May 2011) [M] Polyploca ridens: Larva (Northern Greece 2011) [M] Polyploca ridens: Larva (eastern Swabian Alb, Southern Germany) [S] Polyploca ridens: Larva (eastern Swabian Alb, Southern Germany) [M] Polyploca ridens: Larva [S] Polyploca ridens: Larval habitat in oak-rich area (Quercus pubescens) in Northern Greece in May 2011 [N] Polyploca ridens: I found repeatedly larvae in early summer in this oak-rich grassland habitat on the eastern Swabian Alb (photo in July 2006) [N]

Host plants:
The caterpillars live on Quercus species (oak).

Habitat:
Polyploca ridens inhabits warm oak forests and oak-lined dry slopes or even parks.

Life cycle:
The moths fly from March to mid-May. The caterpillar is found mainly in May and June (probably still in early July) between spun leaves. The pupa or better the almost developed moth overwinters in the pupal skin.

Endangerment: regionally endangered or decreasing

Endangerment factors:
Polyploca ridens is in decline north of the Alps due to the displacement of the oak in forests in favour of fast-growing trees and increasing dark forest management.

Remarks:
Polyploca ridens occurs from Northern Spain across much of the non-polar Europe to Western Asia.