Description on anatomy and histology of Echinometra mathaei (Echinoidea: Camarodonta: Echinometidae), the Persian Gulf sea urchin

Echinoids were collected at depth of 0-5 m from coastal water of Larak Island, the Persian Gulf in January 2016. Soft tissues of the animal including peristome, peritoneum, gills, podium, ampulla, axial organ, gonads and food canal were taken and fixed in %10 formalin. Five micron sections were stained by hematoxylin and eosin method and studied under light microscope. The anatomy and histology of organs including peristome, peritoneum, gills,