Sirenians (Sirenia)

Sirenians (Sirenia), otherwise called ocean bovines, are a gathering of warm blooded creatures that
incorporates dugongs and manatees. There are four types of sirenians alive today, three types of manatees and one types of dugong. A fifth types of sirenian, the Stellar's ocean dairy animals, got to be terminated in the 18th century because of over-chasing by people. The Stellar's ocean cow was the biggest individual from the sirenians and was once inexhaustible all through the North Pacific. Sirenians are huge, moderate moving, amphibian vertebrates that live in shallow marine and freshwater territories in tropical and subtropical districts. Their favored territories incorporate marshes, estuaries, marine wetlands and seaside waters. Sirenians are all around adjusted for an oceanic lifestlye, with a lengthened, torpedo-formed body, two oar like front flippers and an expansive, level tail. In manatees, the tail is spoon-formed and in the dugong, the tail is V-shaped.Sireninans have, throughout the span of their advancement, everything except lost their rear appendages. Their rear appendages are minimal and are modest bones inserted in their body divider. Their skin is dim chestnut. Grown-up sirenians develop to lengths of somewhere around 2.8 and 3.5 meters and weights of somewhere around 400 and 1,500 kg.All sirenians are herbivores. Their eating regimen differs from species to species, however incorporates a mixed bag of oceanic vegetation, for example, ocean grass, green growth, mangrove leaves, and palm natural product that falls into the water. Manatees have advanced a remarkable tooth game plan because of their eating routine (which includes the pounding of a great deal of coarse vegetation). They just have molars that are supplanted persistently. New teeth developed in at the back of the jaw and more established teeth make headway until they achieve the front of the jaw where they drop out. Dugongs have a marginally diverse plan of teeth in the jaw yet like manatees, teeth are constantly supplanted for the duration of their life. Male dugongs create tusks when they achieve maturity.The first sirenians developed around 50 million years prior, amid the Center Eocene Age. Antiquated sirenians are thought to have begun in the New World. Upwards of 50 types of fossil sirenians have been distinguished. The nearest living in respect to sirenians are the elephants.The essential predators of sirenians are people. Chasing has assumed a significant part in the decrease of numerous populaces (and in the eradication of the Stellar's ocean cow). Anyway, human movement, for example, angling, and natural surroundings obliteration can likewise by implication undermine sirenian populaces. Different predators of sirenians incorporate crocodiles, tiger sharks, executioner whales, and panthers.

Key Qualities 

The key qualities of sirenians include:

vast sea-going herbivores

streamlined body, no dorsal blade

two front flippers and no rear legs

level, oar formed tail

nonstop tooth development and substitution of molars

Grouping 

Sirenians are grouped inside the accompanying taxonomic hierarchy:Animals > Chordates > Vertebrates > Tetrapods > Warm blooded creatures > SireniansSirenians are separated into the accompanying taxonomic gatherings:

Dugongs (Dugongidae) - There is one types of dugong alive today. The (Dugong dugon) possesses seaside marine waters of the western Pacific and Indian Seas. The dugong has an Angular (fluked) tail and guys develop tusks.

Manatees (Trichechidae) - There are three types of manatees alive today. Individuals from this gathering are generally single creatures (with the exception of moms with their young). Manatees lean toward freshwater oceanic natural surroundings and beachfront saltwater swamps. Their conveyance incorporates the Caribbean Ocean, the Inlet of Mexico, the Amazon Bowl, and parts of west Africa, for example, the Senegal Stream, Kwanza Waterway, and Niger Waterway.