The sea spider

       The sea spider

Spiders sea, are marine arthropods, a global, found especially in the Mediterranean region and the Caribbean, as well as the oceans Arctic and the Antarctic, there are more than 1,300 known species, which range in size from 1-10 mm to more than 90 cm, in some deep-water species, mostly towards the end of this range is smaller than in the relatively shallow depths, however, they can grow to be very large in the Antarctic waters...

Sea spiders have a long legs in contrast to a small body size, the number of walking legs usually eight (four pairs), but the species with five and six pairs exist. Because of their small size and thin body and legs, the respiratory system is not essential, with the gas moving before publication. Her hose allows them to absorb nutrients from the soft-bodied invertebrates, and digestive system has diverticula extends to the legs.

Sea spiders are so small that all of them small muscle consists of only one single cell, surrounded by connective tissue. The front area of ​​the hose is made up, which are limited to a certain extent on the movement of the dorsal-ventral and sides, and appendages that are used in the Youth Welfare, Khartoum sophisticated and more mobile and flexible, and is equipped often with many powerful sensory hairs around the mouth. The last part includes the anus and tubercle.

In total spiders sea has 4-6 pairs of legs for walking, as well as other appendages that often resemble the legs, front of the head is much smaller, abdominal pose the body, which may be up to two dorsally pairs simple eyes fall on a non-calcareous, in the exoskeleton, and despite the sometimes the eyes can be missing, especially among the species that live in the deep ocean, does not have any growths in the abdomen, and in most species is reduced almost symbolic. This chelicerate devices extends across many appendages because her body is too small to accommodate them all alone.

These small animals live in many different parts of the world, from Australia, New Zealand, and the Pacific coast of the United States, the Mediterranean and the Caribbean, to the north and south poles. They are most common in the shallow water, but can be found at a depth of 7,000 meters (23,000 feet), live in both marine and estuarine habitats. The well-camouflaged under rocks and the algae that are found along the beaches.

Sea spiders either walk along the bottom with stilt legs like swimming or just above it using pulse umbrella movement, most carnivorous and feed on hollow objects, sponges, echinoderms, sea spiders generally from predators or scavengers. They often add the hose, long limbs are used for digestion and absorption of nutrients in the intestines to her, to sea anemones and absorption of food. And sea anemones, large compared with its predatory animals.