Striped oak gall wasp

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Striped oak gall wasp
Striped oak gall wasp (Cynips longiventris), winter generation

Striped oak gall wasp ( Cynips longiventris ), winter generation

Systematics
Superfamily : Gall wasps (Cynipoidea)
Family : Gall wasps (Cynipidae)
Subfamily : Cynipinae
Tribe : Cynipini
Genre : Cynips
Type : Striped oak gall wasp
Scientific name
Cynips longiventris
Hartig , 1840
Gall wasp head (winter generation)
Winter generation gall on the underside of the leaf of a pedunculate oak
Bile of the winter generation after the gall wasp hatched
Bile of the winter generation after the hatching of a wasp of the genus Torymus
Gall apple with a coarser line pattern

The striped oak gall wasp ( Cynips longiventris , syn .: Diplolepis longiventris ) is a member of the gall wasp family ( Cynipidae ).

bile

The spherical gall apples of the parthenogenetic winter generation reach a diameter of up to 10 mm. They have a red base color and have a pattern of yellow vertical lines. They are usually found on the underside of the leaves of various oaks ( Quercus ), especially English oak ( Quercus robur ), but also sessile oak ( Quercus petraea ), Hungarian oak ( Quercus frainetto ) and downy oak ( Quercus pubescens ). There are also galls of the (sexual) summer generation. These are about 2 mm in size, covered with hair in the shape of a cone, and are located on the not yet fully developed buds of the oaks.

insect

The adults of the parthenogenetic winter generation have a body length of approx. 3.2 mm. The dark brown colored insects have 13-segment antennae . The first two antennae (scapus and pedicellus) are thickened. The gall wasps have yellow hairs on their bodies, but also on their legs and antennae. The wings have a characteristic brown veining .

The adults of the summer generation are smaller with a length of approx. 2.5 mm. The females have 14 antennae segments, the males 15. The first two antennae segments are also thickened. The wings also have a characteristic brown wing veining.

distribution

The species is widespread in Europe. It is also represented in the British Isles .

Way of life

In summer, the females lay their fertilized eggs on the underside of the leaves of various oaks. In the following months (June to October), the spherical plant galls develop on the side veins of the leaves, and within each one larva . In November or December, usually when the leaves have fallen to the ground, the adults of the parthenogenetic winter generation leave their galls. The galls are often parasitized , especially by the wasps genus Torymus .

The adults of the winter generation lay their unfertilized eggs on the buds of oaks, where smaller galls form in the following months. The adults of the sexual summer generation appear in May.

Individual evidence

  1. ↑ a b c d Cynips longiventris . bladmineerders.nl. Retrieved November 25, 2019.
  2. ↑ a b c Thomas Lohrer: Striped oak gall wasp . ARBOFUX - diagnostic database for trees. Retrieved November 25, 2019.
  3. ↑ a b c d e Cynips longiventris ( no ) www.artsdatabanken.no. Retrieved November 25, 2019.
  4. ↑ Cynips longiventris in Fauna Europaea. Retrieved November 25, 2019

Web links

Commons : Striped oak gall wasp ( Cynips longiventris )  - Collection of images, videos and audio files