Echinodermata Characteristics

Symmetry
Adult echinoderms possess five-sided, symmetry, echinoderm larvae are ciliated, free-swimming organisms that organize in bilateral symmetry.

Reproduction
Echinoderms usually reproduce sexually, but some reproduce asexually like sea stars and sea cucumbers.

Organs
Echinoderms possess a simple digestive system which varies according to the animal's diet. Starfish are mostly carnivorous and have a mouth, two-part stomach, intestine and rectum.