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

A couple of sharks produce live young (viviparous) after inner fertilization. The posterior edge of the male’s pelvic fins room modified right into a clasper, i beg your pardon acts together an intromittent body organ in copulating with the female. Many sharks lay huge yolky, encapsulated eggs v hooks because that attachment. The young construct directly and also begin life together miniature adults. The young that build in the mother’s uterus obtain nutrients native the large yolk sac until they room born alive. In a couple of cases, the uterine wall secretes nutrients.

The teleostome, or osteichthyian, fishes (those having an internal bony skeleton) can be separated into 2 groups: the subclasses Actinopterygii (ray-finned fishes) and Sarcopterygii (lobe-finned fishes). The last group contains the lungfishes, which live in marshes, ponds, or streams, and also are regular air breathers. They put fairly huge eggs, v a restricted amount the yolk, that room enclosed in jelly coats prefer those of one amphibian. The eggs build into tiny fishes the feed top top live prey. The larvae the the african lungfish have external gills to complement oxygen intake.

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The teleostomes

Actinopterygian fishes space the typical bony fishes of modern aquatic environments. They selection in dimension from fishes that are only millimetres in dimension to those two or much more metres (6.6 or much more feet) in length, weighing 500 kilograms or more. Large species (sturgeons) are discovered in fresh waters (several other huge species are discovered in the Amazon) as well as in marine environments. The diet may incorporate plants, animals, and carrion. Most species are midwater swimmers, however many spend lot time lied on the bottom. Tail, pectoral, and also even dorsal fin are provided in swimming. Reproduction in this group is by method of huge numbers of little eggs, i m sorry produce little larvae or construct directly to the adult.