(Holothuria Scabra) Sandfish- The sandfish is a species of sea cucumber. They are similar to sea urchins and starfish. They all have radial symmetry. Sea cucumbers are a leather texture and have a group of feeding tentacles at one end near the mouth.
(Diadema Antillarum) Black Sea Urchin- These sea urchins are characterized by their long, thin, black spines. Their spines can be between 300-400mm in length. They are extremely sensitive to light and prefer shallow, darker waters. This sea urchin also has high reactivity and sensitivity to it's surroundings and will wave its spines in the direction of a disturbance.
Puckett, Erin. "Diadema Antillarum." Animal Diversity Web. University of Michigan. 2014. http://animaldiversity.org/accounts/Diadema_antillarum/
Dance, Susan K., Idris Lane, and Johann D. Bell. “Variation in Short-Term Survival of Cultured Sandfish (Holothuria Scabra) Released in Mangrove–seagrass and Coral Reef Flat Habitats in Solomon Islands.” Aquaculture 220, no. 1–4 (April 14, 2003): 495–505. doi:10.1016/S0044-8486(02)00623-3.