Phractolaemus ansorgii

Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Osteichthyes
Classis: Actinopterygii
Subclassis: Neopterygii
Infraclassis: Teleostei
Superordo: Ostariophysi
Ordo: Gonorynchiformes
Familia: Phractolaemidae
Genus: Phractolaemus

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]
References

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

* "Phractolaemus ansorgii". Integrated Taxonomic Information System. http://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=162844. Retrieved 11 March 2006.
* Froese, Rainer, and Daniel Pauly, eds. (2006). "Phractolaemidae" in FishBase. May 2006 version.
* Froese, Rainer, and Daniel Pauly, eds. (2006). Species of Phractolaemus in FishBase. May 2006 version.
* Froese, Rainer, and Daniel Pauly, eds. (2006). "Phractolaemus ansorgii" in FishBase. May 2006 version.