Osteoglossiformes

Osteoglossiformes
Temporal range: Late Jurassic–Recent [1]
Osteoglossum bicirrhosum
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Cohort: Osteoglossomorpha
Order: Osteoglossiformes
L. S. Berg, 1940
Type species
Osteoglossum bicirrhosum
Cuvier (ex Vandelli), 1829
Families
Synonyms
  • Mormirimi Rafinesque 1810
  • Mormyriformes
  • Scyphophori

Osteoglossiformes /ˌɒstiːoʊˈɡlɒsɪfɔːrmiːz/ (Greek: "bony tongues") is a relatively primitive order of ray-finned fish that contains two sub-orders, the Osteoglossoidei and the Notopteroidei. All of at least 245 living species inhabit freshwater. They are found in South America, Africa, Australia and southern Asia, having first evolved in Gondwana before that continent broke up.[2] In 2008, several new species of marine osteoglossiforms were described from the Danish Eocene Fur Formation, dramatically increasing the diversity of this group. This implies that the Osteoglossomorpha is not a primary freshwater fish group with the osteoglossiforms having a typical Gondwana distribution.[3]

The Gymnarchidae (the only species being Gymnarchus niloticus, the African knifefish[4]) and the Mormyridae[5] are weakly electric fish able to sense their prey using electric fields.

The mooneyes (Hiodontidae) are often classified here, but may also be placed in a separate order, Hiodontiformes.

Members of the order are notable for having toothed or bony tongues, and for having the forward part of the gastrointestinal tract pass to the left of the oesophagus and stomach (for all other fish it passes to the right). In other respects, osteoglossiform fishes vary considerably in size and form; the smallest is Pollimyrus castelnaui, at just 2 centimetres (0.79 in) long, while the largest, the arapaima (Arapaima gigas), reaches as much as 2.5 metres (8.2 ft).[2]

  1. ^ Froese, Rainer; Pauly, Daniel (eds.). "Order Osteoglossiformes". FishBase. January 2009 version.
  2. ^ a b Greenwood, P.H. & Wilson, M.V. (1998). Paxton, J.R. & Eschmeyer, W.N. (eds.). Encyclopedia of Fishes. San Diego: Academic Press. pp. 81–84. ISBN 0-12-547665-5.
  3. ^ Bonde, N., 2008: Osteoglossomorphs of the marine Lower Eocene of Denmark – with remarks on other Eocene taxa and their importance for palaeobiogeography. Geological Society, London, Special Publications; 2008; v. 295; p. 253-310
  4. ^ Froese, Rainer; Pauly, Daniel, eds. (2014). "Gymnarchus niloticus". FishBase.
  5. ^ Greenwood, P.H. & Wilson, M.V. (1998). Paxton, J.R. & Eschmeyer, W.N. (eds.). Encyclopedia of Fishes. San Diego: Academic Press. p. 84. ISBN 0-12-547665-5.