Original description as Placidochromis macrognathus:
ZooBank:388C3C06-1B63-4794-95CB-8B137BFC0D47.
- Hanssens, Mark. 2004. "The deep-water Placidochromis species". In: J. Snoeks (ed.), The Cichlid Diversity of Lake Malawi, Identification, Distribution and Taxonomy. pp. 104-196 (crc01165)
Conservation: Placidochromis macrognathus is evaluated by the international union for the conservation of nature in the iucn red list of threatened species as (LC) least concern (2018).