Original description as Ptychochromis insolitus:
- Stiassny, Melanie & John S. Sparks. 2006. "Phylogeny and Taxonomic Revision of the Endemic Malagasy Genus Ptychochromis (Teleostei: Cichlidae), with the Description of Five New Species and a Diagnosis for Katria, New Genus". American Museum Novitates. (n. 3535); pp. 1–55 (crc01327) (abstract)
Conservation: Ptychochromis insolitus is evaluated by the international union for the conservation of nature in the iucn red list of threatened species as (CR) critically endangered (2016). Ptychochromis insolitus appears to be rare throughout its limited range, and few specimens have been collected despite sizeable collections of other species having been made in this region, including other cichlids (e.g. Paretroplus nourissati and P. cf. kieneri) (Stiassny et al., 2006).