Hydrelia sylvata
Brown Striped alder tensioner ( Hydrelia sylvata )
The Brown Striped alder tensioner ( Hydrelia sylvata ), also alder swamp wood - blade tensioner, Gray alder or alder leaf tensioner tensioner called, is a butterfly (moth ) from the family of the tensioner ( Geometridae ).
- 6.1 Notes and references
- 6.2 Literature
Features
The moths have a wingspan of 18-23 millimeters ( 20 to 22 millimeters). The ground color of the forewings is whitish, whitish gray to light beige. They have light brown to dark brown, wavy transverse lines and have in midfield a limited indistinct brown median fillet. A Diskalfleck may be present in some specimens, however, is usually small and indistinct limited or absent. The hind wings have the same design as the front wings. The seam lines of the front and hind wings are marked by each interrupted at the veins lines. The transverse lines vary somewhat in the intensity of the training and also some in the assembly.
Caterpillar and chrysalis
The relatively short and stubby caterpillar tapers to both the front and the rear end. It is violet-red to purple- brown, tinged on the sides of the front and back greenish and rose in the middle. The back line and some V-shaped spots on the back is white, the side ridgelines only slightly brighter than the ground color. The side of the fifth abdominal segment sit yellow spots. The point warts are black, but white margins. The small head is notched dark green and deep.
The shiny blue-green to greenish brown doll has yellow-colored segment incisions.
Geographical distribution and habitat
The area of the species extends from the Iberian Peninsula and the British Isles in the west, across Central and Eastern Europe, Siberia to the Russian Far East and Japan. The northern boundary runs in Europe in the mid Fennoscandia, the southern boundary of the Alpine region.
The Brown Striped alder release occurs mainly in forests, but also in forest bogs. Bergmann refers to them as " indicator species of alder swamp woods in marshy valleys and on their backs in sandy areas of the hills and plains. " In Baden- Württemberg oak-elm floodplain, alder-ash floodplain and ravine forests Spirken Forest moors, fells with Calluna - Molinia bog birch surfaces, forest pine - birch forests were detected on peat and secondary swamp forest formations as a habitat. In the mountains, it rises to near 1700 feet.
Way of life
The Brown Striped alder tensioner is univoltine. The moths fly from May to July. They are nocturnal and come to light. They rest during the day in the vegetation or on tree trunks, but can be easily startled. As a food plant of the caterpillars are given mainly willow ( Salix) and alder ( Alnus ). You may also come the leaves of bilberry (Vaccinium ) and Crawler food in question. Have also been proven Common Hazel (Corylus avellana ). The solitary caterpillars can be found in August and September between spun together leaves of the food plants. The pupa overwinters in a cocoon between leaves on the ground.
Systematics and Taxonomy
The species was described in 1775 by Michael Denis Johann Ignaz and Schiffermueller as first scientifically Geometra sylvata. In earlier work, it is to find among the younger synonym Phalaena testaceata Donovan in 1810, mostly in combination Larentia testaceata or Hydrelia testaceata. Geometra sylvata Denis & Schiffer Müller, 1775 is the type species of the genus Hydrelia Hübner, 1825.
Endangering
The species is regarded in Germany as endangered ( category 3). However, the situation is different in the individual federal states. In Brandenburg, it is considered extinct or lost, in Hamburg, Saxony- Anhalt and Thuringia, it is threatened with extinction. For Lower Saxony, North Rhine -Westphalia and Saarland Category 2 ( high risk ) indicated only for Saxony Category 4R (Potentially rare, but have always been extremely rare) is recorded.