Do sea stars have eyes? Detailed answer

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Do sea stars have eyes? Detailed answer

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Do sea stars have eyes?

The starfish is one of the most curious sea creatures. Among its unusual relatives are spiny sea urchins, sea cucumbers and sea cucumbers. There are about 6000 species of such relatives, which are called "echinoderms".

The starfish and its relatives have well-developed nervous and digestive systems. These systems have the same five-link structure inherent in all echinoderms. Sea stars are sometimes classified into three groups. There are brittle stars that, when caught, shed their long, flexible appendages that can reach a length of 20-25 centimeters.

There are also feather stars, whose wriggling rays look like tufts of feathers. And there are ordinary starfish, the size of which usually does not exceed 13 centimeters. The rough, tough skin of the starfish is covered with short needles. In the center of her body, above and below, are button-shaped discs. Through these disks, the stars draw in or release sea water. The lower discs act as the mouth.

The eyes are at the tips of the rays and are protected by a ring of needles. On the ventral side, grooves with tubular suction legs diverge along the rays. They are used for locomotion and as organs of smell.

The starfish is not able to move very quickly on its small tubular legs, but it is capable of something more remarkable. She can open an oyster! She presses her mouth against the oyster shell and pulls on it until it finally opens. The starfish then turns its stomach inside out, sticks it out of its mouth, and wraps it around the oyster.

The starfish can take food into their mouths in quite the usual way. She is also capable of restoring broken beams. She can even grow a whole new body from a single beam!

Author: Likum A.

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