Dwarf pin beetle
| Dwarf pin beetle | ||||||||||||
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Dwarf pin beetle ( Scolytus pygmaeus ), female, magnified 40 times. |
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| Scientific name | ||||||||||||
| Scolytus pygmaeus | ||||||||||||
| ( Fabricius , 1787) |
The pygmy beetle ( Scolytus pygmaeus ) 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 two to three millimeters long and have a black, cylindrical body. The pronotum is large and narrowed in front, the base and sides are edged. Seen from above, it does not cover the head. The forehead of the male beetle is flat and has long hair. The forehead of the female beetle is arched and almost bald ( sexual dimorphism ). It has no longitudinal keel. The elytra have two types of rows of dots and are red-brown in color. The rows of dots are only apart by dot width. The seam strip of the wing covers is not indented. The abdomen rises obliquely from the second sternite towards the end. The rails ( tibia ) of the forelegs are smooth on the outside and have a hook-shaped curved tip. The third tarsal link is bilobed.
distribution
The species is widespread in Central and Southern Europe. It is also found in the northern Caucasus , Ukraine and Crimea .
Way of life
The dwarf sapwood beetle is found mainly on elms ( Ulmus ), but also on hornbeam ( Carpinus betulus ), red beech ( Fagus sylvatica ), birch ( Betula ), oak ( Quercus ), Prunus species and olive tree ( Olea europaea ). It colonizes the bark of the trees. The feeding picture is a relatively short, two to three, at most five centimeters long, one-armed mother's passage (longitudinal passage). The up to 60 larval ducts branch off to the side. The species forms two generations per year. The beetles are monogamous .
Systematics
Synonyms
The following synonyms are known from the literature for the hornbeam beetle :
- Bostrichus pygmaeus Fabricius, 1787
- Eccoptogaster pygmaeus autumn, 1793
- Scolytus pygmaeus Olivier, 1795
- Hylesinus pygmaeus Fabricius, 1808
- Coptogaster pygmaeus Duftschmid, 1825
- Eccoptogaster balcanicus Eggers, 1911
- Scolytus armatus Comolli, 1837
- Scolytus pygmaeus. inaequipunctatus Butovich , 1929
swell
Individual evidence
- ^ Scolytus pygmaeus (Fabrizius 1787). Fauna Europaea, Version 1.3, April 19, 2007 , accessed on September 18, 2008 .
literature
- Fritz Schwerdtfeger : The forest diseases. Textbook of forest pathology and forest protection . 4th revised edition. Parey, Hamburg et al. 1981, ISBN 3-490-09116-7 .
- Sabine Green : Manual for the determination of the European bark beetle Verlag M. & H. Schaper, Hanover 1979, ISBN 3-7944-0103-4
- Edmund Reitter : Fauna Germanica - The beetles of the German Empire. Volume 5, KG Lutz, Stuttgart 1916
- Edmund Reitter : Fauna Germanica. The beetles of the German Reich (= digital library . 134). Neusatz and facsimile of the 5-volume edition Stuttgart 1908 to 1916. Directmedia Publishing, Berlin 2006, ISBN 3-89853-534-7 .
