There is one myrmecophilous species in this genus. They have very broad heads and their basoflagellomeres are elongate and densely pilose in males. Ptilobactrum was erected by Bezzi (1915: 136) for a Microdon species which had a very broad head and the basoflagellomere was elongate and densely pilose in the male. Cheng and Thompson (2008) considered it as a synonym of Microdon (Microdon) without seeing the species.
|Genus and species||Author and Year||Ant Host||Distribution|
|Ptilobactrum neavei||Bezzi, 1915||ants||Afrotropical|
- Bezzi, M. 1915. The Syrphidae of the Ethiopian Region based on material in the collection of the British Museum (Natural History), with descriptions of new genera and species. British Museum (Natural History), London. 146 pp.
- Cheng, Xin-Yue; Thompson, F. Christian (2008). "A generic conspectus of the Microdontinae (Diptera: Syrphidae) with the description of two new genera from Africa and China". Zootaxa. New Zealand: Magnolia Press. 1879: 21–48.
- Reemer, M. & G. Stahls 2013. Phylogenetic relationships of Microdontinae (Diptera: Syrphidae) based on molecular and morphological characters. Systematic Entomology 38 (4): 661-688.