What are the unique features of the animals of phylum - Echinodermata?

What are the unique features of the animals of phylum - Echinodermata?

The animals belonging to the phylum - Echinodermata are pentaradially symmetrical which means their body can be divided into 5 or multiple parts.

The exoskeleton of the body is full of spikes, spines, and pedicellariae. The body is divided into oral and aboral planes. In the oral plane, there are 5 ambulacral grooves. There is a unique water vascular system inside the coelom of the body. Their organ of locomotion is the adjacent tube feet.

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