Small pine bark beetle
| Small pine bark beetle | ||||||||||||
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Pityogenes conjunctus , female (right) and male (left) |
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| Scientific name | ||||||||||||
| Pityogenes conjunctus | ||||||||||||
| ( Reitter , 1887) |
The Small Arvenborkenkäfer ( Pityogenes conjunctus ) is a weevil from the subfamily of the bark beetle (Scolytinae). Since it creates its breeding systems in the bark of the host trees, it is counted among the bark breeders.
features
The beetles are 2.2 to 2.8 millimeters long and have a black-brown cylindrical body. The throat plate is provided with a front rim fine humps, evenly curved, with dotted base and hidden when viewed from above the head. The pronotum base is unrimmed and has a smooth, flat longitudinal callus at the back. Seen from below, the tip edge of the elytra is simple, immediately encompassing the abdomen . The sutural teeth are clearly visible. The wing covers are at least as long as they are wide up to the sutural teeth. The edges of the fall have few, long hair. The abdomen remains straight from the second sternite towards the end. The third tarsal link is cylindrical in shape. The antennae and legs are yellow.
Male and female animals differ from each other ( sexual dimorphism ). In the males, the sutural tooth is strong, thorn-shaped, the tip slightly curved and far from the hook tooth. The second tooth on the fall is a large hook tooth that ends in a point. There is a hair-bearing hump between the hook tooth and the lower conical tooth. The female forehead is covered with a patch of yellowish hair. Only small bumps can be found on the fall.
Occurrence
The species is common in Central Europe.
Way of life
Pityogenes conjunctus occurs on mountain pine ( Pinus mugo ) and on Swiss stone pine ( Pinus cembra, locally also called Swiss stone pine ). It colonizes the bark of the trees. The feeding pattern has a ramming chamber from which three to five irregular mother tunnels branch off in a star shape. The animals are polygamous . There is only one generation a year.
Systematics
Synonyms
The following synonyms are known from the literature for Pityogenes conjunctus :
- Pityogenes bistridentatus Reitter, 1894
- Pityogenes alpinus Eggers, 1922
- Pityogenes baicalicus Eggers, 1933
- Pityogenes montanus Balachowsky, 1949
swell
Individual evidence
- ^ Pityogenes conjunctus (Reitter 1887). Fauna Europaea, Version 1.3, April 19, 2007 , accessed on September 19, 2008 .
literature
- Sabine Grüne : Handbook for the determination of the European bark beetles . M. & H. Schaper Verlag, Hannover 1979, ISBN 3-7944-0103-4
- Edmund Reitter : Fauna Germanica - The beetles of the German Empire . Volume 5 p. 301, KG Lutz, Stuttgart 1916
- Edmund Reitter: Fauna Germanica - The beetles of the German Empire . 5 volumes, Stuttgart KG Lutz 1908–1916, digital library volume 134, Directmedia Publishing GmbH, Berlin 2006, ISBN 3-89853-534-7
