Defiant head (insect)

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Defiant head
Hadrobregmus pertinax bl.jpg

Defiant head ( Hadrobregmus pertinax )

Systematics
Order : Beetle (Coleoptera)
Subordination : Polyphaga
Family : Rodent beetle (Ptinidae)
Subfamily : Anobiinae
Genre : Hadrobregmus
Type : Defiant head
Scientific name
Hadrobregmus pertinax
( Linnaeus , 1758)

The defiant head ( Hadrobregmus pertinax ) is a beetle from the family of the rodent beetles (Ptinidae).

features

The beetles reach a body length of 4.5 to 6 millimeters. Their body is broad, cylindrical, is very fine, short and sparsely hairy and has a black-brown color. The pronotum is broadly rounded on the front and depressed on the sides. There are also two large impressions at the base, which are lightly hairy on the outer edge. In the middle of the pronotum there is a high hump, which is indented in a U-shape on the front. The upper wings (elytres) carry numerous longitudinal rows with large, elongated points. The antennae are colored brown. In the case of the males, the last three limbs are together the same length as the rest together. In the females they are shorter.

Synonyms

  • Dermestes bipunctatus Cabinet, 1776
  • Anobium fagi autumn, 1783
  • Ptinus rufus Gmelin, 1790
  • Ptinus rugosus Gmelin, 1790
  • Anobium striatum Fabricius, 1787
  • Dendrobium pertinax Mulsant & Rey , 1863
  • Coelostethus pertinax LeConte, 1861

Occurrence

The species occurs in Europe , beyond the Arctic Circle . In the south they can also be found in higher altitudes. The species is absent on the British Isles and the Netherlands . The species, which was originally widespread, is no longer so common due to its chemical control. They are rarely found in built-in wood in buildings, mainly in coniferous wood, but rarely also in that of deciduous trees. The flight time is from May to August.

Way of life

As with various other rodent beetle species, wood plays an important role in the life cycle of the defiant head beetle, as it serves the larvae as a habitat and food. The larvae are fungal instructed previously damaged wood. The defiant head is therefore (like eg the pied rodent beetle ) called a “rotten wood insect” and can be seen as an indicator of an existing fungal infestation.

The larvae develop in the wood of spruce and pine . The females lay six to eight eggs in corridors about 10 millimeters long in the wood. The larvae take two years to develop. When the infestation is advanced, the wood is criss-crossed by feeding tunnels and has circular exit holes approx. Two to three millimeters in diameter on the surface. The adults hatch in autumn, but only fly out after wintering.

Combat

An infestation by the defiant head can greatly accelerate the destruction of fungus-infested wood, but always represents secondary damage. Therefore, priority should be given to eliminating the cause and combating the fungal attack.

See also

credentials

  1. ↑ a b c d e f g Hadrobregmus pertinax (Linnaeus 1758). Fauna Europaea, Version 1.3, April 19, 2007 , accessed on October 21, 2007 .

literature

  • Karl Wilhelm Harde, Frantisek Severa and Edwin Möhn: The Kosmos Käferführer: The Central European Beetles. Franckh-Kosmos Verlags-GmbH & Co KG, Stuttgart 2000, ISBN 3-440-06959-1 .
  • Klaus Kempe: Wood pests. 3. edit u. exp. Edition, Verlag Bauwesen, Berlin 2004, ISBN 3-345-00827-0
  • Hans-Peter Sutter: Recognizing and combating wood pests on cultural assets. 4th edition, Haupt Verlag, Bern 2002, ISBN 3-258-06443-1
  • Edmund Reitter : Fauna Germanica - The beetles of the German Empire. Volume 3 p. 312, KG Lutz, Stuttgart 1911
  • 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
  • Jiři Zahradník, Irmgard Jung, Dieter Jung et al .: Käfer of Central and Northwestern Europe , Parey, Berlin 1985, ISBN 3-490-27118-1

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