Echinoderms are considered a member of phylum echinodermata which live only in salt water it takes its name from the Greek word that means “spiny skin” and includes the following animals:

• Starfish.
• Urchins. 
• Brittle stars. 
• Sea cucumbers.
• Sand dollars.

Although not all echinoderms have spiny skin, most of them have a very rough texture and you can find some species that have wield toxic spines as a defense mechanism.

In this article, we will provide you with five facts about echinoderms that you will find fantastic.

5 Facts about Echinoderms

Echinoderms are one of the fascinating marine life is that can amaze you here are 5 fantastic facts about echinoderms:

• Echinoderms are radially symmetric.
• Echinoderms can regenerate any part of their body.
• Echinoderms don’t have blood.
• Some of them feed by ejecting their stomachs.
• Echinoderms don’t have eyes.

Echinoderms are Radially Symmetric 

The body of the adults echinoderms is made up of equal sections either five or multiple of five surrounding a central point. In both brittle stars and starfish, you can find each of these sections in the form of an arm-like a bandage resembling a wheel spoke in being away from the center. Each of its body sections contains a duplicate set of internal organs.

Echinoderms Can Regenerate Any Part of Their Body 

Economies have a fantastic ability to regrow lost limbs or other parts of the body, even internal organs have the same ability. 

When attacked, many echinoderms will gradually regenerate their damaged limbs immediately after closing the wound. Some species can also use regeneration as a form of reproduction as they break themselves apart, after that each piece can grow to form a whole new echinoderm.

Echinoderms Don’t Have a Heart or Blood 

Echinoderms have no blood or even a heart. Instead of that,  they utilize a water vascular system that carries oxygen to its vital organs. 

Echinoderms draw sea water by its tubular feet, then these tubes squeeze oxygenated water through the other parts of its body. This system is responsible for its movement, as the expansion and contraction of the tube feet allow them to grasp both surfaces and prey.

Some of Them Feed by Ejecting Their Stomachs 

Starfish particularly can digest their pries by extruding the stomach through their mouths. Many species of ecodermis prefer feeding on shellfish and use their tube feet to grip and open the shell. 

After that, they eject the stomach into the shell and secret types of digestive juices to dissolve the shell’s contents, then suck it back up into its body with the liquified meal.

Echinoderms Don’t Have Eyes 

One of the fantastic facts about echinoderms is that they have no brain. Instead of that, they have a nerve network. 

There are some species, like starfish, have light sensitive organs on the arms which are called “eyespots”. These organs can only sense varying degrees of light without providing detailed images allowing the animal to have an idea of where it’s going.