polypterus


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polypterus

(pəlĭp`tərəs): see bichirbichir
, common name for African freshwater fishes as of the family Polypteridae, and particularly for those of the genus Polypterus. Bichirs are among the most primitive of the ray-finned fishes, or Actinopterygii, the dominant group of modern fishes.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Polypterus

 

a genus of fishes of the superorder Polypteri. The body is elongated (up to 120 cm long) and slightly laterally compressed. The pectoral fins have a fleshy lobe at their base; the dorsal fin consists of a number of small fins, each of which has a rigid anterior ray. The ventral fins are placed far to the rear. The body is covered with ganoid scales. The swim bladder is double and alveolate; it opens ventrally and acts as a lung. The fishes rise to the surface for air. If they are deprived of atmospheric air, they die within two or three hours; however, they cannot live outside the water.

There are ten species of Polypterus, inhabiting the quiet back-waters of rivers and lake lagoons in Africa. They feed on small fish and invertebrates. The fishes spawn from July to September (during the rainy season); the roe are small (up to 1–3 mm) and strongly pigmented. Larvae with external gills emerge from the roe. Polypterus is of minor commercial value. The flesh is tasty. Some species are kept in aquariums.

REFERENCES

Nikol’skii, G. V. Chastnaia ikhtiologiia, 3rd ed. Moscow, 1971.
Zhiznzhivotnykh, vol. 4, part 1. Moscow, 1971.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Scientists are studying the scales of the freshwater fish, polypterus senegalus, in the hope of learning engineering lessons that can be put to practical use.
The first species to have a structured larynx are the polypterus (or lungfish).
Evolution of the feeding mechanism in primitive actinopterygian fishes: A functional anatomic analysis of Polypterus, Lepisosteus, and Amia.
Evolution of feeding mechanisms in primitive actinopterygian fishes: a functional analysis of Polypterus, Lepisosteus, and Amia.
Canadian researchers belonging to the University of Ottawa and McGill University studied a species of fish called Polypterus senegalus, that has both lungs and gills, enabling it to breathe on land as well.
The pattern of skull sutures in Acanthostega doesn't match the one found in Polypterus, a modern fish that, like most fish today, captures its prey by slurping it in (SN: 4/24/04, p.