Bichir

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Bichirs
Fossil range: Middle Cretaceous - present
Polypterus bichir
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Polypteriformes
Family: Polypteridae
Genera

Erpetoichthys
Polypterus
See text for species.

The bichirs are a family, Polypteridae, of archaic-looking ray-finned fishes, the sole family in the order Polypteriformes.

Contents

[edit] Anatomy and appearance

They have thick bonelike ganoid scales and a series of 8-15 dorsal finlets instead of a single dorsal fin. Each of these finlets have a sharp spine. Their jaw structure more closely resembles that of the tetrapods than that of the teleost fishes. Bichirs have a number of other primitive characteristics. One of these such characteristics are fleshy pectoral fins similar to lobe-finned fishes. They also have spiracles. All species occur in freshwater habitats in Africa, mainly swampy, shallow floodplains and estuaries. They have rudimentary lungs, which allow them to obtain oxygen from the air when in poorly oxygenated waters[1], by swimming quickly to the surface and back to the bottom.

The maximum length among these species is about 90 cm, although most will not exceed much more than 30 cm.

[edit] Relationship to humans

Bichirs are popular subjects of public and large hobby aquaria. Though predatory, they are otherwise peaceful and relatively nonactive, preferring to lay on the bottom, and make good tankmates with other species that are large enough not to be prey. Some aquarists note that Loricariid catfish may attack bichirs and suck on their skin.

[edit] Species

There are eighteen extant species and subspecies in two genera:[2]

Extinct species include:

  • Polypterus faraou Otero et al., 2006 — late Miocene.[4]

[edit] References

  1. ^ Berra, Tim M. (2001). Freshwater Fish Distribution. San Diego: Academic Press. ISBN 0-12-093156-7
  2. ^ "Polypteridae". FishBase. Ed. Rainer Froese and Daniel Pauly. February 2006 version. N.p.: FishBase, 2006.
  3. ^ Schliewen & Schafer (2006). "Polypterus mokelembembe, a new species of bichir from the central Congo River basin (Actinopterygii: Cladistia: Polypteridae).". Zootaxa 1129: 23. 
  4. ^ Otero, Likius, Vignaud & Brunet (2006). "A new polypterid fish: Polypterus faraou sp. nov. (Cladistia, Polypteridae) from the Late Miocene, Toros-Menalla, Chad". Zoological Journal of the Linnean Society 146 (2): 227. doi:10.1111/j.1096-3642.2006.00201.x. 

[edit] External links