Blomer's Rivulet
Elm - tensioner ( Venusia blomeri )
The elm - tensioner ( Venusia blomeri, formerly Discoloxia blomeri ) or elm leaf clamp is a butterfly (moth ) from the family of the tensioner ( Geometridae ). The species was named by John Curtis after the British Amateurentomologen Charles Blomer.
- 6.1 Notes and references
- 6.2 Literature
Features
Butterfly
The wingspan of the butterfly is 20 to 26 mm. The forewings have a gray-white color with some blurred dark transverse lines. The root field is dusted uneven light brown. Before the wing tip there is a large chestnut- brown spot, which is limited to midfield towards dark and expands in an attenuated, tapered shape to the inner edge. This drawing characterizes the kind of unique. The white gray hind wings show some indistinct dark transverse lines.
Egg, caterpillar, pupa
The egg is yellow, small, square, flat and has diamond-shaped depressions. The caterpillar is yellowish or light green. Head, thorax segment and the penultimate segment are reddish brown striking. The doll is penetrated with a tapering abdomen and curved hooks on the cremaster.
Synonyms
- Discoloxia blomeri
- Larentia blomeri
Occurrence
The species occurs in Central and Eastern Europe, the UK, Scandinavia and northern Asia. It is to be found in particular in higher mountain ranges, in the foothills of the Alps and the Alps prefers rocky forest valleys, rocky slopes and canyons.
Way of life
The nocturnal moths fly in two generations from late May to late July and late August to late September. Accordingly, the caterpillars times from September to October and from July to August. The caterpillars feed on the leaves of elm (Ulmus glabra), or field elm (Ulmus minor) and pupate in a cocoon between the leaves. The pupae overwinter.
Endangering
In Germany, the species occurs sporadically and is on the Red List of endangered species in category 3 ( endangered) out.