Idomacromia proavita Karsch, 1896
Greater Shadowcruiser

Type locality: Cameroon, no locality data available.


Male is similar to I. jillianae, 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) ranging from E DRC to W Africa; (2) larger size, Hw 40-46 mm; (3) venter of thorax anteriorly metallic green, posteriorly with dark brown triangle, these colours enclose V-shaped yellow marking; (4) vulvar scale with pointed apices, separated by cleft that narrows towards base, hairs on apices extend into this cleft; (5) wing bases with dark subcostal rays to Ax3-7; (6) Pt larger with 3 mm; (7) 24-29, rather than 19-23 cells in anal loop. [Adapted from Dijkstra & Clausnitzer 2014; this diagnosis not yet verified by author]

Habitat description

Seeps and springs, but possibly also headwater streams, shaded by forest. Usually with coarse detritus. From 0 to 1000 m above sea level.


confirmed: Côte d'Ivoire; Cameroon; Democratic Republic of the Congo; Gabon; Liberia; Nigeria; Republic of Guinea; Sierra Leone

Female © KD Dijkstra

Female © KD Dijkstra

Appendages (dorsal view)

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.

Barcode specimen(s):

Female; Liberia, Nimba County, Mt Tokadeh © Dijkstra, K.-D.B.


  • Karsch, F. (1896). Zwei neue von Herrn G. Zenker in Kamerun erbeutete Odonaten. Entomologische Nachrichten, 22, 17-22. [PDF file]
  • Karsch, F. (1899). Odonaten von Johann-Alrecht-Höhe (Nord- Kamerun), gesammelt von Herrn Leopold Conradt. Entomologische Nachrichten, 25, 161-176. [PDF file]
  • Sjöstedt, Y. (1900). Odonaten aus Kamerun, West -Afrika. Beltrage Zur Kenntnis der insektenfauna von Kamerun. Binhang Kongliga Svenka VetenskapsAkademiens Handlingar, 25, 1-62.

Citation: Dijkstra, K.-D.B (editor). African Dragonflies and Damselflies Online. [2024-07-21].