Dolerus stygius
A black species. In the female, the top of the head, mesonotum and mesopleura have dense woolly pubescence that is longer than the width of the apex of the fore basitarsus. In both sexes, the front margin of the clypeus is sharply incurved and emarginated to a depth of much less than half the length of the clypeus. The mesoscutellum lacks a carina and is highly polished without punctures or striations. In the male, the penis valve has a large ventral tooth that terminates in a small hook.
Larvae feed on sedges.
Size: 9.5-10.5mm
Status: Rare
Distribution: England, Scotland, Wales
Flight period: May to June
Plant associations: Cyperaceae (sedges)
The National Biodiversity Network records are shown on the map below. (See terms and conditions)
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- Dolerus stygius male Credit Ian Andrews
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- Dolerus stygius male Credit Colin Le Boutillier
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- Dolerus stygius male Credit Colin Le Boutillier
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- Dolerus stygius male post-ocellar furrow Credit Andrew Green
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- Dolerus stygius male mesoscutellum Credit Andrew Green
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- Dolerus stygius male mesoscutellar appendage Credit Andrew Green
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- Dolerus stygius male penis valve Credit Andrew Green
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- Dolerus stygius penis valve Credit Ian Andrews
References:
Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London
Heidemaa, M. and Viitasaari, M., 2004. Taxonomy of the Dolerus gibbosus species group with descriptions of Dolerus zhelochovtsevi sp. nov., the males of D. blanki Liston, 1995 and D. quadrinotatus Biro, 1884, and redescription of the D. gibbosus Hartig, 1837 male (Hymenoptera: Tenthredinidae). Zootaxa.
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