Dyscia fagaria (Thunberg, 1784) Species
Last modified: May 16, 2024, 12:27 p.m.
A very rare and local species, almost exclusively confined to the Kempen.
This species is considered Endangered according to the IUCN Red List category for Flanders 2023.
Details
- Classification
- Family: Geometridae > Subfamily: Ennominae > Tribus: Aspitatini > Genus: Dyscia > Subgenus: Eudyscia > Species: Dyscia fagaria
- Vernacular names
- Gevlekte heispanner (NL), Grey Scalloped Bar (EN), La Fidonie des Bruyères (FR), Heidekraut-Fleckenspanner (DE)
- Synonyms
- Dyscia belgaria (Hübner, 1790)
- First mention in Belgium
- Fologne E. 1862c. Notes sur quelques lépidoptères observés en Belgique. — Annales de la Société entomologique belge 6: 170–176. On page 171.
- Status
-
Native
Distribution
Imago
Wingspan 28–35 mm.
Museum specimens
Specimens in nature
Bionomics
Hibernates as a small larva in a cocoon formed on the food plant or in fallen debris.
The male basks on stones and broken or bare ground and is easily disturbed by day. Both sexes found at rest on their food plants after dark. They come to light in small numbers.
Flight periods
The adults fly in one generation a year from early May till late June.
During very good weather conditions a second smaller partial generation can occur, mostly in September even in October.
Habitat
It prefers open dry and young heath vegetation with little or no tree cover and with open spots between the heather bushes, these spots are covered with lichens or have no vegetation at all.
Leaf fall can be disastrous. This allows a rough litter layer to develop as a result of which leaf mosses grow lushly and causing excessive humidity for this species.
