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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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.
References in periodicals archive ?
The unique experiment called The Terrestrialized Polypterus Experiment aimed at giving some insight into how these fossil fishes could have used their fins to move in a terrestrial environment and the way they could have evolved.
This fish fauna is composed primarily of silurids (especially Clarias and Auchenoglanis), but also features important numbers of Tilapia, Lares (including large 1m+ individuals), Polypterus and Gymnarchus (in decreasing order of frequency).
The first species to have a structured larynx are the polypterus (or lungfish).
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.