Temnocerus nanus
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_Syn.-_Pselaphorhynchites_nanus_(Paykull,_1792)_(7833113788).png)
Temnocerus nanus |
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| Scientific name | ||||||||||||
| Temnocerus nanus | ||||||||||||
| ( Paykull , 1792) |
Temnocerus nanus is a beetle from the subfamily Rhynchitinae within the leaf roller (Attelabidae). A common synonym is Pselaphorhynchites nanus .
features
It is a small beetle 2 to 2.8 millimeters long. It is dark blue in color and has a somewhat metallic sheen. The top is covered with short, snug black hair that is nondescript so that it appears bald at first glance. The species has relatively narrow, parallel- sided wing covers , which are significantly wider than the laterally rounded pronotum . The wing covers have clearly grooved, deepened point stripes, with an additional, shortened stripe being formed at the very front next to the seam (generic feature). The head is (including the eyes) about as wide as the front edge of the pronotum. The head has rounded temples, but is not constricted like a neck. The trunk is slightly curved and shorter in the male, slightly longer than the pronotum in the female, it is shorter in comparison than in Temnocerus longiceps . In contrast to Temnocerus tomentosus , the front splint does not have a thorn at the tip. The species of the genus are difficult to distinguish and are often confused. In the male, the antennae are in about the middle of the trunk, in the female in the basal third.
Way of life
The species lives on deciduous trees of the genera Betula ( birch ), Salix ( willow ; both narrow-leaved and broad-leaved species) and Alnus ( alder ). The females lay eggs in the buds of the shoot tips, usually one egg per bud. To do this, it gnaws out an egg chamber, which is closed again with a plug of food residue after the egg has been laid. After laying the eggs, the young shoot is eaten underneath, so that it withers and kinks, but it usually remains on the tree. The larva develops in the withering bud. The finished larva overwinters in the bud. She finally drops to the ground and digs a doll's chamber in the ground. It pupates into a young beetle in spring. Adult beetles can be observed from May to mid-summer (early August). They eat holes in leaves that have sprouted young (window corrosion).
distribution
The species lives all over Europe, from Norway to the Mediterranean area (where it is rare), also in North Africa north of the Sahara, Asia Minor, southern Siberia to Central Asia (Kazakhstan). It is widespread everywhere in Germany, but it is rarely found, but this could be due to deficits in evidence. They should prefer cool, damp habitats here, without being strictly bound by them.
swell
- Hans Gonget: The Nemonychidae, Anthribidae and Attelabidae (Coleoptera) of Northern Europe. Fauna Entomologica Scandinavica, Vol. 38. Brill Academic Publishers (Leiden).
- Joachim Rheinheimer & Michael Hassler (2010): The weevils of Baden-Württemberg. Publishing house regional culture. ISBN 978-3-89735-608-5 .
- Lothar Dieckmann (1974): Contributions to the insect fauna of the GDR: Coleoptera- Curculionidae (Rhinomacerinae, Rhynchitinae, Attelabinae, Apoderinae). Contributions to entomology: Contributions to the insect fauna of the GDR Vol. 24: 5–54, doi : 10.21248 / contrib.entomol.24.1-4.5-54 .
- AA Legalov (2006): To the knowledge of the genus Temnocerus Thunberg, 1815 (Coleoptera, Rhynchitidae). Far Eastern Entomologist 165: 1-14.
- Eduard Voss (1932): Monograph of the Rhynchitinen-Tribus Rhynchitini. 2nd genus group: Rhynchitina. V. 1st part of the monograph of the Rhynchitinae-Pterocolinae. (41st contribution to the knowledge of the curculionids.). Coleopterological Review Vol. 18, No. 3/4: 153-189.
