Oryginalny opis jako Pseudotropheus callainos:
ZooBank:77DCD02A-9798-477C-8FA8-05888D672FEF.
- Stauffer, Jay Richard Jr. & E. Hert. 1992. "Pseudotropheus callainos, a new species of mbuna (Cichlidae), with analyses of changes associated with two intra-lacustrine transplantations in Lake Malawi, Africa". Ichthyological Explorations of Freshwaters. 3(3):253-264 (crc01065) (streszczenie)
Ochrona: Metriaclima callainos jest wpisany prez Międzynarodową Unię Ochrony Przyrody do Czerwonej Księgi Gatunków Zagrożonych IUCN jako (VU) Narażony (2006). Although the Cobalt Zebra has been collected for the ornamental fish trade since the early beginning of the Malawi cichlid hobby, sometimes at a rate of more than 20,000 zebra per year, there is no visible threat to its existence. None of the geographical variants seems to be at risk.