Heterarthrus cuneifrons

Added to the British list in 2006. One of three Heterarthrus species feeding on Acer species; fiora (formerly misidentified as aceris), cuneifrons and wuestneii. There is historically, confusion between the three and historic records must be treated with uncertainty. This species cannot reliably be distinguished from Heterarthrus wuestneii from the insect morphology. In ecological terms, cuneifrons oviposits into the interior of the leaf blade, whereas wuestneii lays in the leaf margin. Also, cuneifrons feeds on sycamore in Britain, whereas wuestneii feeds on field maple.

Larvae mine the leaves of sycamore starting from the interior of the leaf blade, whereas fiora starts at the leaf margin. A circular cocoon is made from the upper leaf epidermis. This cocoon separates from the leaf prior to the autumn leaf drop leaving a neat hole visible in the leaf. The cocoon works its way into the litter layer.

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Size: 3.5 - 4.5mm

Status: Unknown

Distribution: England

Flight period: Univoltine, May to June

Plant associations: Acer pseudoplatanus (sycamore)

The National Biodiversity Network records are shown on the map below. (See terms and conditions)

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

Liston, A., Mutanen, M. and Viitasaari, M., 2019. On the taxonomy of Heterarthrus (Hymenoptera, Tenthredinidae), with a review of the West Palaearctic species. Journal of Hymenoptera Research, 72, p.83.