Taxonomic revisions can be put to good use in the analysis of conservation priorities and biodiversity studies. Analysis of distribution with regards to vegetation, precipitation and effective temperature followed by species richness and endemism in the Afrotropical members of Graptomyza Wiedemann, 1820, indicate that few areas are protected for this genus. Most species are forest inhabitants. Single genus analyses are of little value unless compared with other distributions, nevertheless Naudesnek Summit in the Eastern Cape (South Africa) is proposed as an important conservation area. A new species, G. spinifera, from Gabon is described, bringing the number of Afrotropical species of this genus to 17; the key of Whittington (1992) is updated. An updated catalogue of Afrotropical species is provided.