Skates killer?

(Novinky.cz, 4 9th 2006) Steve Irwin, the famous Australian environmentalists, presenter and film series protagonist Hunter crocodiles, died during a scuba diving in Port Douglas, Australia. As announced Australian police ctyriactyricetiletemu Irwin in filming underwater document through, chest skate of the family trnuchovitych.

Who are the Skates

Skates are, together with sharks and deep water chimera, classified into groups of prehistoric vertebrates, paryb, which includes over 500 species. Skates are close relatives zralokum, but the (now) stated that the attacks only from a purely defensive duvodu.Charakteristickym the entire class, which has parallels in other groups, the skeleton is composed of solid, but flexible cartilage.

Railway Station rays are divided into systems of rays right, pilounovitych and parejnoku. Skates law contains ten families,of which may be responsible for the death of an Australian scientist only one member trnuchovitych or skates.

Double danger

Trnuchy received its name in accordance with one or more jedovych mandrel to lean back tail. After the entire length of the top of the stretch two flat, at the bottom of the deep longitudinal grooves. Toxic glands are located on the lower side, where the poison batoidotoxin score held up to the tip of the mandrel. The length of the mandrel may reach ctvrtmetrove length and is an effective defense against natural predators, in addition multiplied go to the intrusion into the wound released. Arbors are strongly associated with the tail, but easy to ULOMA the stronger side impact. Soon, however, dorustaji.

Trnuchy may be freshwater or marine.For example, trnucha Castexova> inhabit freshwater rivers South American Amazon, Orinoco and Parana. Weighing up to 15 kilograms and the length of one meter and doziva be fifteen to twenty years. Like all trnuchy has trnucha Castexova toxic glands on the tail and back-hooks.

Examples of marine trnuchy is trnucha modroskvrnna, blue spotted stingray living in the tropical Indian and Pacific Ocean including the Red Sea. Grow to 2.5 meters length. The flat has a tail longer than body, with one to two long thorns. Resides in the shallow waters and lagoons, and the live crustaceans, worms and fish.

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