Genus Nematinus

Nematinus

Globally, there are thought to be 27 species of Nematinus mostly distributed in the Palaearctic region. There are five species in Britain and Ireland.

The genus can be characterised within the Nematinae by the following features. In the forewing vein 2r-rs is absent from the marginal cell. The stub vein 2A+3A is incomplete and straight so that the basal portion of the cell is open. The intercostal cross-vein Sc occurs before the point where vein M meets vein R. The hindwing has an anal cell. The tarsal claws have an inner tooth but no basal lobe. In the female, the ninth tergite is enlarged so that in lateral view the tergite is more than three times as long as the preceeding tergite. In the male, the penis valve is strongly narrowed apically often to form a filament. The left mandible in lateral view tapers gradually along its length rather than quickly narrowing in the middle.

Larvae feed on species of the the Betulaceae and Corylaceae families.

Species list:

Nematinus acuminatus (Thomson, 1871)

Nematinus caledonicus (Cameron, 1882)

Nematinus fuscipennis (Serville, 1823)

Nematinus luteus (Panzer, 1803)

Nematinus steini Blank, 1998

References:

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

Lindqvist, E. 1957: Zur Kenntnis der paläarktischen Nematinus-Arten (Hym., Tenthredinoidea). - Notulae Entomologicae, Helsingfors 37: 12-16

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

Muche, W. H. 1977: Die Blattwespen Mitteleuropas. Die Gattungen Nematinus Rohw., Euura Newm. und Croesus Leach (Nematinae) sowie Heterarthrus Steph. (Heterarthrinae) (Hymenoptera, Nematinae et Heterarthrinae). - Entomologische Abhandlungen.

Prous, M., Liston, A., Kramp, K., Savina, H., Vårdal, H. and Taeger, A., 2019. The West Palaearctic genera of Nematinae (Hymenoptera, Tenthredinidae). ZooKeys, 875, p.63.

Smith, D. R. 1986: The sawfly genus Nematinus in North America (Hymenoptera: Tenthredinidae). - Proceedings of the entomological Society of Washington, Washington 88: 476-484

Smith, D. R. 2017: Nematinus acuminatus (Thomson) (Hymenoptera: Tenthredinidae), A Newly Recognized Holarctic species. - Proceedings of the entomological Society of Washington, Washington 119(2): 296-297.

Togashi, I. 1991: Three new species of the Nematinus acuminatus group (Hymenoptera: Tenthredinidae) from Japan, with a key to species. - Proceedings of the entomological Society of Washington, Washington 93: 652-659

Togashi, I. 1995: A New Species of the Nematinus acuminatus Group (Hymenoptera, Tenthredinidae) from Japan. - Japanese Journal of Systematic Entomology, Matsuyama 1(1): 23-25

Togashi, I. 2007: Sawflies of the Nematinus luteus Group (Insecta: Hymenoptera: Tenthredinidae) from Japan. - Bulletin of the National Museum of Nature and Science, Series A (Zoology), Tokyo 33 (2): 85-92