Calyptra thalictri (Borkhausen, 1790)


Calyptra thalictri: Adult (e.l. Ticino 2008) [S] Calyptra thalictri: Adult [S] Calyptra thalictri: Adult (e.l. Ticino 2008) [S] Calyptra thalictri: Ovae (in breeding) [S] Calyptra thalictri: Larva in penultimate instar ( moult rest into last instar, Ticino) [N] Calyptra thalictri: Larva (Ticino) [N] Calyptra thalictri: Larva [S] Calyptra thalictri: Larva [S] Calyptra thalictri: Larva detail [S] Calyptra thalictri: Larva [S] Calyptra thalictri: Larva (Olympus, 2000m asl, early August 2012) [N] Calyptra thalictri: Larva (Olympus, 2000m asl, early August 2012) [N] Calyptra thalictri: Pupa [S] Calyptra thalictri: Habitat: Thalictrum minus edge in the Ticino (2008) [N] Calyptra thalictri: Feeding pattern on Thalictrum (Olympus, 2000m asl, late July 2012) [N] Calyptra thalictri: Larval habitat on Olympus in 2000m asl in a avalanche ravine (early August 2012) [N]

Host plants:
The larvae feed on Thalictrum minus, probably also other Thalictrum species (Ranunculaceae).

Habitat:
Calyptra thalictri colonizes herb-rich and mosaic-like areas with steppe-like grasslands, rock fragments and sparse forests, where the food plant occurs.

Life cycle:
The caterpillar overwinters and is mature in May or early June (later in the mountains). In rare cases larvae are observed even in late July and early August in high elevations as on Mount Olympus in 2000m asl in a avalanche ravine at 2000m asl after a snow-rich winter. The larva is observed on the host plant also during the day, but are sometimes concealed on leaf undersides or at the stem base. The moths fly from mid-June to August.

Endangerment factors:
Calyptra thalictri is locally endangered (e.g. in Ticino) by the darkening of forests and too intense bush encroachment in rocky areas.

Remarks:
The distribution ranges from Northern Spain and south-eastern France across the Southern Alps and Central Italy (Apennines) to Southeastern Europe (widespread) and further across temperate Asia to Japan.


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