Tetrathemis ruwensoriensis Fraser, 1941
Ruwenzori Elf

Synonyms:

  • scientific: T. ruwenzoriensis

Type locality: Ruwenzori Mountains, Uganda

Diagnosis

Male is typical of the scarcer rainforest (from W Kenya to W Africa) Tetrathemis species by (a) interpleural stripe runs from wing base to metastigma, parallel to metapleural and humeral stripes, sometimes partly fused with humeral; (b) never pruinose and wings always clear, although base may be yellow; (c) arculus usually at or distal to Ax2; (d) Hw supratriangles with 1 cross-vein; (e) bridge spaces with 1 cross-vein; (f) lateral pale spot on S1 adjoined to similar spot on S2; (g) cerci less than 3x as long as S10, rather straight. Close to T. godiardi by combination of (h) S10 at most as long as S9 (dorsal view); (i) cerci equal to or shorter than epiproct; (j) epiproct triangular, with rather narrow apex; but (1) cerci convergent, apices rounded (dorsal view); (2) epiproct at least 1.2x longer than cerci (lateral view). [Adapted from Dijkstra & Clausnitzer 2014]

Habitat description

Not known, but probably standing and often temporary waters shaded by forest. Usually with overhanging branches and probably coarse detritus and a soft (like muddy) bottom. Inferred to occur from 700 to 1300 m above sea level.

Distribution

confirmed: Congo-Brazzaville; Democratic Republic of the Congo

Appendages (dorsal view)

Appendages (lateral view)

Map citation: Clausnitzer, V., K.-D.B. Dijkstra, R. Koch, J.-P. Boudot, W.R.T. Darwall, J. Kipping, B. Samraoui, M.J. Samways, J.P. Simaika & F. Suhling, 2012. Focus on African Freshwaters: hotspots of dragonfly diversity and conservation concern. Frontiers in Ecology and the Environment 10: 129-134.


Reference

  • Fraser, F.C. (1941). Notes on the genus Tetrathemis Brauer with descriptions of three new African species (Odonata). Proceedings Royal Entomological Society London Serie B, 10, 137-142. [PDF file]

Citation: Dijkstra, K.-D.B (editor). African Dragonflies and Damselflies Online. http://addo.adu.org.za/ [2021-12-05].