Idaea degeneraria, the Portland ribbon wave, is a moth of the family Geometridae. The species was first described by Jacob Hübner in 1799.GBIFEncyclopedia of Life
Subspecies In alphabetical order:Insecta.pro Idaea degeneraria alticolaria (Schawerda, 1933) Idaea degeneraria degeneraria (Hubner, 1800) Idaea degeneraria erschoffi (Christoph, 1872)
Description
The species has a wingspan of 26–31 mm. These small pale brown geometers are darker brown-marked between antemedian and median lines.
Biology The larvae feed on various low herbaceous plants, mainly dandelion (Taraxacum species) and knotgrass (Polygonum species). The adults fly in one generation from June to July.
Distribution This species can be found in most of Europe, in the Near East and in North Africa.Fauna Europaea These moths prefer warm limestone undercliffs.Chris Manley British Moths. Second edition
Notes The flight season refers to the British Isles. This may vary in other parts of its range.
References
Guliyeva, Hokuma Ecological-Physiological Characteristics of the Absheron Population of Idaea degeneraria Hubn. (Lepidoptera, Geometridae)
External links Portland ribbon wave at UKMoths Lepiforum e.V.