Cape Verde Islands from two localities: Praia, Ilha Santiago, also Ilha São Vicente. Geolocation 14.918° -23.509° is for Praia. Potts (1924) also placed specimens from Torres Strait as the same species but excluded them from the type series thus "The type-specimens come from the subtropical regions of the North Atlantic, but I was surprised to find a Mesochætopterus of common occurrence in Torres Straits, which is, without doubt, identical with M. minuta”. The type locality is incorrectly stated to be Torres Strait in the Hartman Catalogue (1959: 397).
Potts, Frank A. 1914. Polychaeta from the N.E. Pacific: The Chaetopteridae. With an account of the phenomenon of asexual reproduction in Phyllochaetopterus and the description of two new species of Chaetopteridae from the Atlantic. Proceedings of the Zoological Society of London 67: 955-994. available online athttp://www.biodiversitylibrary.org/page/31856337