Original description as Haplochromis macrostoma:
- Regan, Charles Tate. 1922. "The Cichlid Fishes of Lake Nyassa". Proceedings of the Zoological Society of London. 1921 (pt 4) n. 36; pp. 675-727 (crc00066)
- Haplochromis maculiceps Ahl, 1926, with type locality at Near Langenburg, Lake Malawi. Determiner: Konings, 1990
- Haplochromis polyodon Trewavas, 1935, with type locality at Vua, Lake Malawi. Determiner: Konings, 1990
Conservation: Tyrannochromis macrostoma is evaluated by the international union for the conservation of nature in the iucn red list of threatened species as (LC) least concern (2018). Although Tyrannochromis macrostoma is a voracious piscivore it is rarely caught on hook and line. It seems that it needs to find its prey between the rocks and perhaps its prey needs to be alive before it is attacked. As far as I know there is no overfishing of this species.