 A study published in 2011 revealed several mtDNA clades in this region, suggesting a higher tigerfish species richness than traditionally recognized.If confirmed, this would restrict "H. goliath" to the Congo River Basin.Four additional species ("H. vittatus" and three undescribed species) appear to be present in this Basin, while two ("H. vittatus" and an undescribed species) appear to be present in Lake Tanganyika.