echinoderms
An echinoderm () is any animal of the phylum Echinodermata (), which includes starfish, brittle stars, sea urchins, sand dollars and sea cucumbers, as well as the sessile sea lilies or "stone lilies". While bilaterally symmetrical as larv ...
belonging to the family
Echinometridae
The Echinometridae are a Family (biology), family of sea urchins in the class (biology), class Echinoidea.
Characteristics
All Echinometridae have imperforate tubercles and compound ambulacral plates.
The species is found in Indian and Pacific Ocean.