Hingemouth

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

The mouth can extend like a small trunk, thus the name, and has just two teeth, both in the lower jaw. Its mouth can extend up to 30% of the hingemouth's head length. It has highly flexible lips, and its mouth is mainly supported by cartilage and other connective tissues.<ref>Template:Cite journal</ref> The swim bladder has two compartments, and can function as a lung, allowing the hingemouth to survive in oxygen-poor environments.<ref name=EoF>Template:Cite book</ref>

References

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 | publisher = Integrated Taxonomic Information System
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