Fundulopanchax sjostedti, the blue gularis, golden pheasant gularis or red aphyosemion, is a species of toothcarp endemic to the Niger delta.

[1] It is named after the Swedish naturalist Bror Yngve Sjöstedt (1866–1948) who collected the type specimen close to a waterfall by the Ndian River, in the Ndian department in Cameroon's Southwest Region.

They outsize all other members of their genus, attaining lengths of 14 centimetres (5.5 in).

It's a powerful and predatory species, feeding on invertebrates as well as small fish.

However it's not the largest species of killifish; note for example the Gulf killifish (Fundulus grandis) which can reach a maximum length of 18 centimetres (7.1 in).