Idomacromia jillianae Dijkstra & Kisakye, 2004
Jill's Shadowcruiser

Type locality: Ruhija, Uganda


Male is similar to I. proavita, and similar to all other Isomacromia species by (a) anal loop elongate rather than stout, of 14-29 cells, extends about to level of radial fork, with distinct midrib; (b) sectors of arculus only fused at their origin. However, differs by (1) being restricted to SW Uganda; (2) smaller size, Hw 35-37 mm; (3) venter of thorax anteriorly metallic green, posteriorly all yellow; (4) vulvar scale with truncate apices, cleft widens towards base, hairs confined to apices; (5) wing bases faintly yellow to about Ax1; (6) Pt smaller, with 2 mm; (7) 19-23, rather than 24-29 cells in anal loop. [Adapted from Dijkstra & Clausnitzer 2014; this diagnosis not yet verified by author]

Habitat description

Not known well, but probably streams shaded by forest. Probably often with coarse detritus. Recorded at around 2100 m above sea level.


confirmed: Uganda

Abdomen (ventral view)

Abdominal segments 8-10 (lateral view)

Abdominal segments 8-10 (ventral view)

Abdominal segments 8-10 (dorsal 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.


  • Dijkstra, K.-D.B., and Kisakye, J.J. (2004). Idomacromia jillianae sp. nov. from Uganda (Odonata: Corduliidae) International Journal Odonatology, 7, 459-466. [PDF file]

Citation: Dijkstra, K.-D.B (editor). African Dragonflies and Damselflies Online. [2024-07-25].