Original description as Petrochromis trewavasae ephippium:
- Brichard, Pierre. 1989. "Pierre Brichard's book of cichlids and all the other fishes of Lake Tanganyika - Petrochromis ephippium". TFH Publications. pp. 396-401 (crc03469) (abstract)
Conservation: Petrochromis ephippium is not evaluated by the international union for the conservation of nature in the iucn red list of threatened species.