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

Gonioctena (Gonioctena) viminalis (Linnaeus, 1758)

Korbweiden-Blattkäfer

Synonyms:

Chrysomela viminalis Linnaeus, 1758 | Chrysomela fridrichsdalensis Müller, 1764 |

  • Gonioctena viminalis  3079
    Gonioctena viminalis (Linnaeus, 1758)  Korbweiden-Blattkäfer   
    Gonioctena viminalis
    DE, Chemnitz, Zeisigwald; 2007-05-18 12:08:51
    Image number: 3079

    DE, Chemnitz, Zeisigwald
    2007-05-18 12:08:51

  • Gonioctena viminalis  3080
    Gonioctena viminalis (Linnaeus, 1758)  Korbweiden-Blattkäfer   
    Gonioctena viminalis
    DE, Chemnitz, Zeisigwald; 2007-06-16 11:53:51
    Image number: 3080

    DE, Chemnitz, Zeisigwald
    2007-06-16 11:53:51

  • Gonioctena viminalis  3064
    Gonioctena viminalis (Linnaeus, 1758)  Korbweiden-Blattkäfer   
    Gonioctena viminalis
    DE, Chemnitz, Zeisigwald; 2009-04-26 11:38:17
    Image number: 3064

    DE, Chemnitz, Zeisigwald
    2009-04-26 11:38:17

  • Gonioctena viminalis  3065
    Gonioctena viminalis (Linnaeus, 1758)  Korbweiden-Blattkäfer   
    Gonioctena viminalis
    DE, Chemnitz, Zeisigwald; 2009-05-01 13:51:15
    Image number: 3065

    DE, Chemnitz, Zeisigwald
    2009-05-01 13:51:15

  • Gonioctena viminalis, larva  7753
    Gonioctena viminalis (Linnaeus, 1758)  Korbweiden-Blattkäfer   
    Gonioctena viminalis, larva; conf. Christoph Benisch
    DE, Chemnitz, Zeisigwald; 2017-06-02 11:21:03
    Image number: 7753
    larva
    DE, Chemnitz, Zeisigwald
    2017-06-02 11:21:03
    conf. Christoph Benisch
  • Gonioctena viminalis, larva  7754
    Gonioctena viminalis (Linnaeus, 1758)  Korbweiden-Blattkäfer   
    Gonioctena viminalis, larva
    DE, Chemnitz, Zeisigwald; 2017-06-02 15:47:06
    Image number: 7754
    larva
    DE, Chemnitz, Zeisigwald
    2017-06-02 15:47:06

  • Gonioctena viminalis, larva  7755
    Gonioctena viminalis (Linnaeus, 1758)  Korbweiden-Blattkäfer   
    Gonioctena viminalis, larva
    DE, Chemnitz, Zeisigwald; 2017-06-06 09:49:22
    Image number: 7755
    larva
    DE, Chemnitz, Zeisigwald
    2017-06-06 09:49:22

  • Gonioctena viminalis, larva  7756
    Gonioctena viminalis (Linnaeus, 1758)  Korbweiden-Blattkäfer   
    Gonioctena viminalis, larva
    DE, Chemnitz, Zeisigwald; 2017-06-06 09:49:39
    Image number: 7756
    larva
    DE, Chemnitz, Zeisigwald
    2017-06-06 09:49:39

  • Gonioctena viminalis, pupa  7757
    Gonioctena viminalis (Linnaeus, 1758)  Korbweiden-Blattkäfer   
    Gonioctena viminalis, pupa
    DE, Chemnitz, Zeisigwald; 2017-06-09 10:28:08
    Image number: 7757
    pupa
    DE, Chemnitz, Zeisigwald
    2017-06-09 10:28:08

  • Gonioctena viminalis, pupa  7758
    Gonioctena viminalis (Linnaeus, 1758)  Korbweiden-Blattkäfer   
    Gonioctena viminalis, pupa
    DE, Chemnitz, Zeisigwald; 2017-06-12 10:13:27
    Image number: 7758
    pupa
    DE, Chemnitz, Zeisigwald
    2017-06-12 10:13:27

  • Gonioctena viminalis, pupa  7759
    Gonioctena viminalis (Linnaeus, 1758)  Korbweiden-Blattkäfer   
    Gonioctena viminalis, pupa
    DE, Chemnitz, Zeisigwald; 2017-06-12 10:17:25
    Image number: 7759
    pupa
    DE, Chemnitz, Zeisigwald
    2017-06-12 10:17:25

  • Gonioctena viminalis, pupa  7760
    Gonioctena viminalis (Linnaeus, 1758)  Korbweiden-Blattkäfer   
    Gonioctena viminalis, pupa
    DE, Chemnitz, Zeisigwald; 2017-06-14 14:14:46
    Image number: 7760
    pupa
    DE, Chemnitz, Zeisigwald
    2017-06-14 14:14:46

  • Gonioctena viminalis, pupa  7761
    Gonioctena viminalis (Linnaeus, 1758)  Korbweiden-Blattkäfer   
    Gonioctena viminalis, pupa
    DE, Chemnitz, Zeisigwald; 2017-06-14 14:17:45
    Image number: 7761
    pupa
    DE, Chemnitz, Zeisigwald
    2017-06-14 14:17:45

  • Gonioctena viminalis, pupa  7762
    Gonioctena viminalis (Linnaeus, 1758)  Korbweiden-Blattkäfer   
    Gonioctena viminalis, pupa
    DE, Chemnitz, Zeisigwald; 2017-06-14 14:18:07
    Image number: 7762
    pupa
    DE, Chemnitz, Zeisigwald
    2017-06-14 14:18:07

  • Gonioctena viminalis, pupa  7763
    Gonioctena viminalis (Linnaeus, 1758)  Korbweiden-Blattkäfer   
    Gonioctena viminalis, pupa
    DE, Chemnitz, Zeisigwald; 2017-06-14 14:18:29
    Image number: 7763
    pupa
    DE, Chemnitz, Zeisigwald
    2017-06-14 14:18:29

  • Gonioctena viminalis, freshly hatched  7764
    Gonioctena viminalis (Linnaeus, 1758)  Korbweiden-Blattkäfer   
    Gonioctena viminalis, freshly hatched
    DE, Chemnitz, Zeisigwald; 2017-06-14 17:47:42
    Image number: 7764
    freshly hatched
    DE, Chemnitz, Zeisigwald
    2017-06-14 17:47:42

  • Gonioctena viminalis, freshly hatched  7765
    Gonioctena viminalis (Linnaeus, 1758)  Korbweiden-Blattkäfer   
    Gonioctena viminalis, freshly hatched
    DE, Chemnitz, Zeisigwald; 2017-06-14 17:48:02
    Image number: 7765
    freshly hatched
    DE, Chemnitz, Zeisigwald
    2017-06-14 17:48:02

  • Gonioctena viminalis  7766
    Gonioctena viminalis (Linnaeus, 1758)  Korbweiden-Blattkäfer   
    Gonioctena viminalis
    DE, Chemnitz, Zeisigwald; 2017-06-14 19:00:35
    Image number: 7766

    DE, Chemnitz, Zeisigwald
    2017-06-14 19:00:35

  • Gonioctena viminalis  7767
    Gonioctena viminalis (Linnaeus, 1758)  Korbweiden-Blattkäfer   
    Gonioctena viminalis; conf. Christoph Benisch
    DE, Chemnitz, Zeisigwald; 2017-06-15 09:00:44
    Image number: 7767

    DE, Chemnitz, Zeisigwald
    2017-06-15 09:00:44
    conf. Christoph Benisch
  • Gonioctena viminalis, bottom view  7768
    Gonioctena viminalis (Linnaeus, 1758)  Korbweiden-Blattkäfer   
    Gonioctena viminalis, bottom view; conf. Christoph Benisch
    DE, Chemnitz, Zeisigwald; 2017-06-15 09:04:40
    Image number: 7768
    bottom view
    DE, Chemnitz, Zeisigwald
    2017-06-15 09:04:40
    conf. Christoph Benisch
  • Gonioctena viminalis  7769
    Gonioctena viminalis (Linnaeus, 1758)  Korbweiden-Blattkäfer   
    Gonioctena viminalis
    DE, Chemnitz, Zeisigwald; 2017-06-16 09:43:48
    Image number: 7769

    DE, Chemnitz, Zeisigwald
    2017-06-16 09:43:48

  • Gonioctena viminalis  8265
    Gonioctena viminalis (Linnaeus, 1758)  Korbweiden-Blattkäfer   
    Gonioctena viminalis
    DE, Chemnitz, Zeisigwald; 2018-05-28 08:56:41
    Image number: 8265

    DE, Chemnitz, Zeisigwald
    2018-05-28 08:56:41


Classification:
Gonioctena viminalis belongs to the subfamily Chrysomelinae, tribe Gonioctenini.
Distribution:
Moderate Paläarktis, from the Pyrenees and British islands east to East-Asia, in the south as far as into Turkey, is missing in Europe in Ireland, Scotland and at the Mediterranean; North America.
Habitat:
In cool, humid, often montane locations (brook margins, forest edges, humid forests) on willows.
Description:
Length 5.5 - 7 mm; variable species; wing covers glossy in both sexes, often black spotted, each with 9 regular dotted stripes arranged in rows; mostly all spaces between the dotted stripes numerously and distinctly dotted; scutellum mostly dark brown or black; pronotum slightly arched, usually coarsely dotted on the sides; Head usually black; antennal segment 3 not or hardly longer than 5, segment 10 not longer than broad; mandibles hollowed out at the sides for insertion of the palpi; last segment of the palpi mostly darkened; legs completely black; front tibiae at the tip with a usually well developed tooth.
Biology:
The adults of Gonictena viminalis are good flyers. They usually appear in May after hibernation.
The univoltine species lives on willows (Salicaceae), especially on broad-leaved species such as eared willow (Salix aurita), gray willow (Salix cinerea) and goat willow (Salix caprea), rarely on poplars (Populus, Salicaceae).
In warmer areas, the females lay eggs at the leaf-undersides. After a few days the larvae hatch. Further north or in cooler locations the females are vivipar, i.e. the larvae hatch already in the female abdomen. The larvae develop from May onwards 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. They can secrete toxins to defend themselves. After a short time the larvae are fully grown. They drop to the ground and pupate in a burrow. The entire development cycle takes about 1 month. The freshly hatched beetles of the new generation undergo a summer diapause in the foliage or soil layer, appear briefly and go on the search for winter shelder.
Note:
The pictures show the development from late-instar larva to imago. The pupa which is orange after moulting changes colour about one day before the beetle emerges. The beetle, which is predominantly light during hatching, needs about one day to take its final colour.

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