TYT.LThome / Insecta · vabzdžiai / Hymenoptera · plėviasparniai / Cimbicidae · cimbeksai / Cimbex femoratus · beržinis cimbeksas

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Cimbex femoratus · beržinis cimbeksas

  • birch sawfly
  • Große Birkenblattwespe, Birkenknopfhornblattwespe
  • beržinis cimbeksas, didysis beržinis pjūklelis
  • lielā bērzu vālīšlapsene
  • bryzgun brzozowiec

They are widespread throughout Europe and Siberia and prefer areas where birch trees can be found. Cimbex femoratus can reach a length of 17–23 mm. The head is large, with large and strong mandibles. Wings are smoky brown with brown margins. The thorax is shiny black. The shiny black abdomen shows a whitish band and a large red-brown band, especially in males. The antennae are black at the base and yellow-orange at the tip. Even the last leg segments are yellowish. The adults fly in May to August.

Larvae are pale bluish-green, about 45 mm long and they look very similar to caterpillars. On the back they usually have a dark, narrow bluish longitudinal stripe. They can be found between June and September and feed exclusively on leaves of birch (Betula sp.).