Spesies tersebut sejauh ini hanya ditemukan di sekitaran pantai selatan Afrika dari pantai Atlantik [[Semenanjung Cape]]<ref>[{{Cite web |url=http://www.biodiversityexplorer.org/mm/molluscs/mandelia_mirocornata.htm |title=Biodiversity Explorer Website, Accessed 23 August 2009] |access-date=2019-06-01 |archive-date=2012-02-17 |archive-url=https://web.archive.org/web/20120217204547/http://www.biodiversityexplorer.org/mm/molluscs/mandelia_mirocornata.htm |dead-url=yes }}</ref> sampai [[Port Elizabeth]] di perairan 10–400 m. Spesies tersebut diyakini bersifat [[endemisme|endemik]].<ref>GOSLINER, T.M. 1987. ''Nudibranchs of Southern Africa'' {{ISBN|0-930118-13-8}}</ref>
