Phylum Arthropoda (Arthropods) ➔ Subphylum Hexapoda (Hexapods) ➔ Class Insecta (Insects) ➔ Order Coleoptera (Beetles) ➔ Family Chrysomelidae (Leaf beetles)

Gonioctena (Gonioctena) decemnotata (Marsham, 1802)

Zehnpunkt-Pappelblattkäfer

Synonyms:

Chrysomela decemnotata Marsham, 1802 | Chrysomela rufipes De Geer, 1775 nec Linnaeus, 1758 | Chrysomela fulvipes (Duftschmid, 1825) | Chrysomela sexpunctata (Fabricius, 1787) nec Linnaeus, 1758 |

  • Gonioctena decemnotata  3077
    Gonioctena decemnotata (Marsham, 1802)  Zehnpunkt-Pappelblattkäfer   
    Gonioctena decemnotata
    DE, Chemnitz, Zeisigwald; 2007-04-28 12:41:58
    Image number: 3077

    DE, Chemnitz, Zeisigwald
    2007-04-28 12:41:58

  • Gonioctena decemnotata, larvae  3078
    Gonioctena decemnotata (Marsham, 1802)  Zehnpunkt-Pappelblattkäfer   
    Gonioctena decemnotata, larvae
    DE, Chemnitz, Zeisigwald; 2007-05-05 13:01:59
    Image number: 3078
    larvae
    DE, Chemnitz, Zeisigwald
    2007-05-05 13:01:59

  • Gonioctena decemnotata  4343
    Gonioctena decemnotata (Marsham, 1802)  Zehnpunkt-Pappelblattkäfer   
    Gonioctena decemnotata
    DE, Chemnitz, Zeisigwald; 2010-05-17 12:49:29
    Image number: 4343

    DE, Chemnitz, Zeisigwald
    2010-05-17 12:49:29


Classification:
Gonioctena decemnotata belongs to the subfamily Chrysomelinae, tribe Gonioctenini.
Distribution:
Europe (except Iberian Peninsula and Ireland), east to Mongolia, south to Turkey.
Habitat:
Light forests and groves with poplars, preferably in drier places, often in hilly areas.
Description:
Length 5.5 - 7.5 mm; variable species; elytra each with 9 regular dotted stripes arranged in rows; scutellum dark brown or black; pronotum slightly arched, usually coarsely dotted on the sides; front part of the head, palpi and antennae reddish, only the last antennal segments slightly darkened; mandibles hollowed out on the sides for insertion of the palpi; legs reddish-yellow or only the tarsi darkened; front tibiae at the tip with a usually well developed tooth.
Biology:
The imagines of Gonictena decemnotata are good flyers. They usually appear in May after hibernation.
The univoltine species usually lives on poplars (Salicaceae), frequently on aspens (Populus tremula, more rarely on black poplars (Populus nigra). Imagines sometimes also feed on willows (Salix).
The females lay their eggs in groups of about 40 pieces. After a few days the larvae hatch. Further north the females are vivipar, i.e. the larvae hatch already in the female abdomen. The larvae develop in May and June and pass through 4 larval stages. They eat together and live in dense groups guarded by their mother on the leaves of their host plant. After a short time (about 2 weeks) the larvae are fully grown. They drop to the ground and pupate in a burrow. After about 8 days the new generation hatches. The beetles undergo a summer diapause in the foliage layer or on the ground, appear briefly and start looking for winter shelter.
The adults of Gonictena decemnotata are long-lived and often overwinter a second time.

References, further reading, links:
  1. Rheinheimer, Joachim, & Hassler, Michael: Die Blattkäfer Baden-Württembergs, 2018, 928 pages, Kleinsteuber Books (Karlsruhe), ISBN 978-3-9818110-2-5
  2. Arved Lompe: Die Käfer Europas - Ein Bestimmungswerk im Internet