(N.B. naming follows Taeger and Viitasaari)
This species equates to Rhogogaster dryas in Benson's key. Most records seem to have been correctly transferred to the new name, although it is possible that some are now mis-assigned. Recorded widely throughout most of mainland Britain, as well as Orkney (Musgrove, 2023).
Superficially similar to the other Rhogogaster species and similar to darker examples of Rhogogaster scalaris (=viridis in Benson). Particularly in males, this species has a deep frontal groove and deep antennal furrows. The antennal crests are somewhat bent upwards. Also, Rhogogaster viridis can be differentiated from scalaris by the sculpture on the mesoscutellar appendage. In Rhogogaster viridis the mesoscutellum is distinctly convex and the anterior part is pitted and more or less densely microsculptured. In R. scalaris there are few or no pits and usually without distinct microsculpture.
Larvae feed on aspen.
Size: 8 - 12mm
GB IUCN Status: Least Concern
GB Rarity Status: None
Distribution: England, Scotland, Wales
Flight period: May to August
Plant associations: Populus tremula (aspen)
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
Musgrove, A.J. 2023. A review of the status of sawflies of Great Britain - Phase 2: The Athaliidae and the Tenthredinidae (excluding Nematinae). Natural England, unpublished
Taeger, A. and Viitasaari, M., 2015. European Rhogogaster s. str., with notes on several Asian species (Hymenoptera: Tenthredinidae). Zootaxa, 4013(3), pp.369-398.