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Fundulopanchax filamentosus

Fundulopanchax filamentosus
Blue Killi
This species is perhaps most often confused with its close relative Fp.arnoldi. The difference is clearly seen however in the caudal peduncle which is much thinner in arnoldi.

Females may be distinguished from its close neighbour Fp.arnoldi by the shape of the caudal fin which is more rounded in filamentosus. Also, the eyes are slightly larger in arnoldi.
The unpaired fins of arnoldi are generally clear whereas these fins in filamentosum are spotted.

Eggs seen under a microscope also show differences. Eggs of filamentosum are larger than arnoldi & have few 'hairs' whereas arnoldi are smaller & have a noticeable amount of 'hairs'.