Pristiphora retusa (Thomson, 1871)

Pristiphora retusa - Pristiphora retusa group

Males are rare and can be distinguished by the penis valves. In the female, the stigma is white in the middle and basally with dark edges. The sawsheath is narrow, being only three times the width of the cerici. The colour is mainly black with yellow mouthparts, pronotal margin, tegulae and some apical abdominal segments laterally.

Pristiphora retusa larvae feed on bird cherry.

Size: 3.0 - 4.0mm

Status: Rare

Distribution: Scotland

Flight period: May to June

Plant associations: Punus padus (bird cherry)

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.D., 1981. Pristiphora (Lygaeophora) lanifica (Zaddach, 1882) new to Britain (Hymenoptera: Tenthredinidae). Entomologist's gazette.

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

Prous, M., Kramp, K., Vikberg, V. and Liston, A., 2017. north-Western Palaearctic species of Pristiphora (hymenoptera, tenthredinidae). Journal of Hymenoptera Research, Vol. 59