Small Fan-footed Wave

Wide Lined dwarf tensioner ( idaea biselata )

Called The broad -lined dwarf tensioner ( biselata idaea ), and wide- Lined veldt small tensioner ( Geometridae ), a butterfly (moth ) from the family of the tensioner.

Features

The moths reach a wingspan of 16 to 21 millimeters, the second generation a wingspan 15-17 mm. The basic color and pattern of the wings are relatively few variable. The basic color is yellowish white to slightly brownish white, the drawing elements are brown to dark brown. On the forewing the inner transverse line and / or the means shadows are drawn mostly indistinct. In contrast, the outer transverse line is most clearly developed. On the Saumfeld is a bright shaft line that is inside and outside lined dark. Front and rear wings have black Diskalpunkte. On the front wings they are surrounded by the central transverse line saumwärts, on the hind wings the inner transverse line is clearly root downward departed. The Saumflecke are dark brown in color, but also developed in part indistinct.

The form f fimbriolata has a wider and more darkened Saumfeld and is widespread in the United Kingdom, while it is rare in continental Europe. The blackout is induced by higher moisture

The oval egg is blunted, the surface covered with shallow depressions. It is initially light yellow, later bright red with dark spots.

The slim, tapered forward caterpillars reach a length of about 22 millimeters. They are gray or brown and have a dark V-shaped marking on the back and a notched, very small head. The crawler body is provided with short hair bristles. Further, there is a pale yellowish brown shape having a similar drawing.

The doll measures 6.1 to 8.0 mm in length and 2.0 to 2.2 mm in diameter. It is light brown, the head and the colored elytra greenish. The cremaster is seen from the dorsal and ventral side nearly rectangular, wedge-shaped in side view. He is busy with four pairs of hook-shaped bristles that are slightly longer than the cremaster.

Similar Species

Geographic occurrence and habitat

The species is widely distributed from western Europe to the Urals. In Northern Europe, the range extends until about the middle Fennoscandia. In the south, the range extends up into the middle Portugal, Corsica, the northern Apennines and in the north of Greece. Isolated occurrences are known from Calabria and the Peloponnese. Outside of Europe, the broad -lined dwarf tension in the Caucasus, Transcaucasus, widespread in northern Turkey, in Siberia, in northern Kazakhstan and the Far East. In Korea and the Ussuri region is the nominotypical subspecies of the subspecies idaea biselata extincta (Staudinger, 1897) represented.

One usually finds the way in altitude 0-800 m, rarely up to 1,200 meters. In the Alps, it rises to about 1,700 meters. South of the Alps it is found 600-1500 meters and is rarely below this range have been found.

The type is moisture and inhabits mainly forested habitats. It prefers moist mixed forests, forest edges, dense hedge stocks and hedgerows. But even in the land of culture, the species is widespread. South of the Alps, it is limited to the beech zone.

Phenology and life

The broad -lined dwarf tensioner is north of the Alps a generation in whose moth flies from late June to early September. Under favorable conditions, a second generation from early August to mid-September may arise, south of the Alps, the moths of this generation from mid-September to early October are observed. The moths are active at the beginning of dawn and are often found in artificial light sources or at the bait. Sucking nectar found the moths pipes grasses ( Molinia ), thistles ( Cirsium ), Exceptional agrimony ( Eupatorium cannabinum ), Common Bulrush ( Eleocharis palustris) and dwarf elder ( Sambucus ebulus ). During the day the moths hide in the shrub layer.

Various Acetate of alkenes are known as pheromone components.

The females lay eggs in July, the caterpillars hatch in August. The caterpillars live individually and feed preferably from fallen wilted or dry leaves of various deciduous trees, as well as herbaceous plants and grasses. In mild weather, the caterpillars feed during the winter months. In the literature, the following food plants are:

  • Blackberry (Rubus fruticosus )
  • Knotweed ( Polygonum aviculare )
  • Dandelion (Taraxacum officinale)
  • Dandelion ( leontodon ) ( leontodon )
  • Grasses ( Poaceae )
  • Linden (Tilia )
  • Hazel (Corylus )
  • Alder ( Alnus )
  • Plantain ( Plantago )
  • Meadow Sage (Salvia pratensis)
  • Clover (Trifolium )
  • Yellow Dock ( Rumex )
  • Bellflower (Campanula )
  • Honeysuckle ( Lonicera )

If the caterpillar is disturbed, then they drop to the ground and remain lying for a while in a hook-like attitude. The caterpillars develop only slowly and unevenly.

The caterpillars overwinter and include the development of the following year in May from. In the southern parts of Western Siberia the species overwinters as a pupa.

System

The species was described in 1767 by Johann Siegfried Hufnagel under the name Phalaena biselata first time scientifically. However, further descriptions were made under different names. Michael Denis and Ignaz Schiffermueller they described 1775 Geometra fimbriata, Stephens, she published in 1831 as Ptychopoda fimbriolata, Walker described her in 1861 as Acidalia plumipedata Walker, 1861, and 1925 as Matsmura Ptychopoda shimizuensis. The latter names are junior synonyms of idaea biselata ( Linnaeus, 1758). Currently, two subspecies are distinguished, which nominotypical subspecies idaea biselata biselata ( Linnaeus, 1758) in the largest part of the range and idaea biselata extincta (Staudinger, 1897) in the Far East. The subspecies is smaller with a wingspan 15-19 mm and the drawing is less pronounced.

Endangering

The species is not endangered in Germany.

Swell

Sterrhinae Genus Idaea (genus) Apennine Mountains Caucasus Mountains Digital Object Identifier
144428
de