Echinoderms are triploblastic and coelomate animals.

Echinoderms are triploblastic coelomates.

• Triploblastic: Echinoderms have three germ layers during embryonic development—ectoderm, endoderm, and mesoderm. This tri-layered structure allows for the formation of various specialised tissues and organs.
• Coelomates: Echinoderms possess a true coelom, which is a fluid-filled body cavity lined by mesoderm. The coelom provides space for the development and movement of internal organs.