Xyela curva Benson, 1938

Xyela curva

Added by Liston and Blank in 2006. The three species of Xyela can be difficult to identify from single specimens due to the few available characteristics.

Males and females are piceous to brown. The male is pale around the eyes and mouth and with reddish legs and is best identified by genital dissection. The female abdomen is laterally pale and pale along the posterior margins of the tergites. The hind claws have a small subapical tooth. The hind femora is mostly pale with a dark longitudinal stripe on the anterior face. The sawsheath is distinctly curved downwards.

Xyela curva larvae feed on the developing pollen in immature male cones causing the cones to become bent out of shape. Several larvae may feed in each cone. Larvae emerge and drop to the ground to pupate. They hatch the next spring or may enter diapause for two to three years. The pupa has free legs and can run around on the surface before the adult emerges from the exuvia.

Size: approx. 2.5 - 4.5mm

Status: Unknown

Distribution: England, Wales

Flight period: Mid-April to mid-May

Plant associations: Pinus nigra (black pine)

References:

Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London

Liston A, Knight G, Sheppard D, Broad G, Livermore L (2014) Checklist of British and Irish Hymenoptera - Sawflies, ‘Symphyta’. Biodiversity Data Journal 2: e1168. https://doi.org/10.3897/BDJ.2.e1168

Blank, S.M., 2002. The Western Palaearctic Xyelidae (Hymenoptera), pp. 197-233. In: Viitasaari, M. (editor), Sawflies (Hymenoptera, Symphyta) I. A review of the suborder, the Western Palaearctic taxa of Xyeloidea and Pamphiloidea, Tremex, Helsinki