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Southern stingrays (Dasyatis americana or Hypanus americanus) are uncovered in the western Atlantic Ocean.

A couple of sharks develop live young (viviparous) after internal fertilization. The posterior edge of the male’s pelvic fins are modified into a clasper, i m sorry acts as an intromittent organ in copulating v the female. Most sharks lay huge yolky, encapsulated eggs v hooks for attachment. The young develop directly and also begin life as miniature adults. The young that build in the mummy uterus acquire nutrients native the huge yolk sac until they are born alive. In a few cases, the uterine wall secretes nutrients.

The teleostome, or osteichthyian, fishes (those having an inner bony skeleton) can be split into 2 groups: the subclasses Actinopterygii (ray-finned fishes) and Sarcopterygii (lobe-finned fishes). The latter group consists of the lungfishes, i m sorry live in marshes, ponds, or streams, and also are frequent air breathers. They lay fairly huge eggs, through a limited amount the yolk, that room enclosed in jelly coats like those of one amphibian. The eggs build into small fishes that feed top top live prey. The larvae the the afri lungfish have external gills to complement oxygen intake.

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The teleostomes

Actinopterygian fishes space the usual bony fishes of contemporary aquatic environments. They range in dimension from fishes the are only millimetres in dimension to those two or more metres (6.6 or more feet) in length, weighing 500 kilograms or more. Huge species (sturgeons) are found in fresh waters (several other big species are discovered in the Amazon) as well as in maritime environments. The diet may encompass plants, animals, and also carrion. Most types are midwater swimmers, yet many spend lot time lie on the bottom. Tail, pectoral, and even dorsal fin are provided in swimming. Reproduction in this team is by way of huge numbers of small eggs, i beg your pardon produce tiny larvae or construct directly come the adult.