Original description as Haplochromis angustifrons var. gracilior:
ZooBank:348B74E7-6907-4C73-99BB-652199DA0E09.
- Boulenger, George Albert. 1914. "Unterordnung: Acanthopterygii. Fam. Cichlidae". Wissenschaftliche Ergebnisse der Deutschen Zentral-Afrika-Expedition 1907-1908, Zoologie. Band 5:253-259 (crc00952)
Conservation: Haplochromis gracilior is evaluated by the international union for the conservation of nature in the iucn red list of threatened species as (LC) least concern (2006).