Dasiatids - Dasyatidae
Dasyatidae (Jordan & Gilbert, 1879) are a family of cartilaginous fishes of the order Myliobatiformes, class Chondrichthyes, subclass Elasmobranchii, which includes saltwater and freshwater species commonly known as stingrays. Dasiatidi Dasyatidae pesci cartilaginei ray razza intotheblue.it
Black Spotted Stingray - Taeniura meyeni
Bluespotted ribbontail ray - Taeniura lymma
Common Stingray - Dasyatis pastinaca
Pelagic stingray - Pteroplatytrygon violacea
Description
They are characterized by a flat, rhomboid body, with the lateral edge of the head continuing with the anterior edge of the large, wing-like pectoral fins. The largest species reach 4 m in length. The eyes are located on the back, and the mouth is ventral. The dorsal fin is absent or barely visible. The tail is thin and long, and is equipped with a venomous spine; in larger specimens, the spine can reach up to 35-40 centimeters in length, has a serrated profile, and is covered by an epithelial sheath. Dasiatidi Dasyatidae Chondrichthyes Pastinaca Trigone intotheblue.it
At the root of the sting are two venom glands that secrete a substance composed of the enzymes 5-nucleotidase and phosphodiesterase, which destroy cells, and serotonin, which causes muscle contractions. This enzyme complex has a necrotizing effect, which can lead to serious bacterial infections. Dasyatidae, Dasyatidae, cartilaginous fish, ray, ray intotheblue.it
If the affected area is a vital organ, the outcome can be fatal (see the example of television host Steve Irwin, who died in Australia after receiving numerous blows from a stingray on September 4, 2006).
Biology
They are benthic animals that spend most of their time resting on the bottom, covered by sand or mud.
Diet
The diet of dasyatids includes mollusks, worms, crustaceans, and fish. Dasyatids Dasyatidae Chondrichthyes Pastinaca Stingray intotheblue.it
Reproduction
They are ovoviviparous animals, meaning the eggs are incubated and hatch within the mother’s body.
Distribution and habitat
Dasyatidae are found in the waters of the Atlantic, Indian, and Pacific Oceans. In the Mediterranean Sea, the family comprises six species: Dasyatis centroura, Dasyatis marmorata, Dasyatis pastinaca, Himantura uarnak (Lesseps migrant), Pteroplatytrygon violacea, and Taeniura grabata.
Most species live in saltwater, but freshwater and brackish water species also exist.
https://en.wikipedia.org/wiki/Dasyatis
https://it.wikipedia.org/wiki/Dasyatidae
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