Common Stingray - Dasyatis Pastinaca
Trigone Dasyatis pastinaca intotheblue.it – Common Stingray Dasyatis Pastinaca Razza Ray Trigone intotheblue.it
The stingray, a breed belonging to the family Dasyatidae, Class Chondrichthyes, is widespread in the North Atlantic Ocean and in the Mediterranean, from Norway to the Baltic Sea to the Canaries and the Black Sea. The ideal habitat is represented by sandy and silty bottoms, where this animal hides and feeds. Common Stingray Dasyatis Pastinaca Razza Ray Trigone intotheblue.it
This stingray can reach 2.5 meters in length and one and a half meters in width. The snout is quite pronounced and the small eyes are followed by two evident spiracles. It has from 28 to 38 rows of tiny teeth in the upper jaw and 28-40 rows in the lower jaw. The tail is equipped with a serrated and venomous prick able to inflict even serious wounds. The color of the back varies from gray-brown to green-olive, while the belly is light in color. Like the other stingrays, dasyatis pastinaca is an ovoviviparous species. Females give birth to 4 to 9 babies twice a year after a four month gestation. It feeds mainly on crustaceans and small benthic fish.
Dasiatids are characterized by a flat rhomboid body, with a lateral margin of the head that continues with the anterior margin of the large pectoral fins in the shape of wings. The largest species reach 4 m in length. The eyes are placed on the back, the mouth is ventral. The dorsal fin is absent or barely sketched. The tail is thin and long, and is equipped with a poisonous sting; in larger specimens, the spine can reach 35-40 centimeters in length, has a serrated profile and is covered by an epithelial sheath.
At the root of the stalk there are two poison glands that secrete a substance composed of the 5-nucleotidase and phosphodiesterase enzymes, which destroy cells, and serotonin, which causes muscle contractions. The action of this enzymatic complex is necrotizing and this is combined with the possibility of even serious bacterial infections.