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Notopteridae (featherback, knifefish; superorder Osteoglossomorpha, order Osteoglossiformes) A small family of freshwater fish, that have a small, feather-like dorsal fin half-way along the back, and a very long anal fin starting near the pectoral-fin base and merging with the small tail fin at the end of the tapering body. There are about six species found in south-east Asia and Africa.