Original description as Haplochromis hennydaviesae:
- Burgess, Warren & H. R. Axelrod. 1973. "New Cichlids from Lake Malawi". Tropical Fish Hobbyist Magazine. 22 (2); pp. 14, 87-98 (crc00162)
Conservation: Placidochromis hennydaviesae is evaluated by the international union for the conservation of nature in the iucn red list of threatened species as (LC) least concern (2018).