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Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Gonorhynchiformes
Family: Phractolaemidae
Genus: Phractolaemus
Boulenger, 1901
Species: P. ansorgii
Binomial name
Phractolaemus ansorgii
Boulenger, 1901

The hingemouth (Phractolaemus ansorgii) is a small freshwater fish that is found only in west central Africa, the sole member of the family Phractolaemidae.

The mouth can extend like a small trunk, thus the name, and has just two teeth, both in the lower jaw. The swim bladder has two compartments, and can function as a lung, allowing the hingemouth to survive in oxygen-poor environments.[1]


  1. ^ Banister, Keith F. (1998). Paxton, J.R.; Eschmeyer, W.N., eds. Encyclopedia of Fishes. San Diego: Academic Press. p. 97. ISBN 0-12-547665-5.