Euura vesicator

Euura vesicator is a species of sawfly belonging to the family Tenthredinidae (common sawflies). The larvae feed internally in a gall on the leaves of purple willow (Salix purpurea) and its hybrids. It was first described by Johann Jacob Bremi-Wolf in 1849.

Euura vesicator
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Suborder: Symphyta
Family: Tenthredinidae
Genus: Euura
Species:
E. vesicator
Binomial name
Euura vesicator
(Bremi-Wolf, 1849)

Description of the gall

The gall is ovoid and bladder like, 11 mm long and 5 mm across, and may broaden the leaf. A single white larva lives within the gall which is only found on purple willow (S. purpurea) and its hybrids.[1]

Euura vesicator is one of two closely related species in the Euura vesicator subgroup; the other being E. pustulator.[2]

Distribution

The sawfly has been recorded from Great Britain (England, Scotland and Wales), the Netherlands and Switzerland.[1][2]

Inquilines and predators
  • Archarius crux (Fabricius, 1776) – the adult weevil overwinter and lays one to eight eggs in the gall. The larvae eat the egg or larva of E. vesicator as well as the gall tissue. Pupation take place in the ground and there are two generations in a year.[3]
  • A. salicivorus (Paykull, 1792) – the adult weevil overwinter and lays an egg in the gall, eventually killing the E. vesicator larva, but not eating it. The larva lies in a horse-shoe position and does not have legs. Pupation is in the ground and there are two generations in a year.[4]
  • Eurytoma aciculata Ratzeburg, 1848 – the chalcid wasp kills the larva and feeds on the gall tissue.[5]
  • Gypsonoma dealbana (Fröhlich, 1828) – the moth larvae are polyphagous usually feeding on buds, catkins and leaves.[6] They have been found in galls leading to the death of the gall causer.[7]

References
  1. Redfern, Margaret; Shirley, Peter; Boxham, Michael (2011). British Plant Galls (Second ed.). Shrewsbury: Field Study Council. pp. 282–299. ISBN 978 185153 284 1.
  2. Liston, Andrew D; Heibo, Erik; Prous, Marko; Vardal, Hege; Nyman, Tommi; Vikberg, Veli (2017). "North European gall-inducing Euura sawflies (Hymenoptera, Tenthredinidae, Nematinae)". Zootaxa. 4302 (1): 100–101. ISSN 1175-5334.
  3. Ellis, W N. "Archarius crux (Fabricius, 1776)". Plant Parasites of Europe. Retrieved 5 July 2018.
  4. Ellis, W N. "Archarius salicivorus (Paykull, 1792)". Plant Parasites of Europe. Retrieved 5 July 2018.
  5. "Eurytoma aciculata Ratzeburg, 1848". Plant Parasites of Europe. Retrieved 5 July 2018.
  6. Smith, Ian F. "49.279 BF1169 Gypsonoma dealbana". UKMoths. Retrieved 5 July 2018.
  7. Ellis, W N. "Gypsonoma dealbana (Fröhlich,1828)". Plant Parasites of Europe. Retrieved 5 July 2018.
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