Sea urchin and anal sack Longspine urchin Diadema setosum, showing its anal sack or anal cone, centre. Photographed off the island of Malapascua in the province of Cebu in the Philippines. Stock Photo - Afloimages
Longspine urchin (Diadema setosum), showing its anal sack (or anal cone, centre). Photographed off the island of Malapascua in the province of Cebu in the Philippines.