sea cucumber holothuroidea laying in the ocean floor, sea urchin diadema setosum hiden in the rock. marine echinoderm animal,

animal aquatic aquatics background barrier bed black body brown chinoderm closeup creature cucumber diadema dive echinoderm egypt environment exotic floor hiden holothurian holothuroidea invertebrate laying life marine natural nature ocean outdoor pacific red reef rock rocks saltwater sandy sea setosum stone surface texture tropical tropics undersea underwater urchin water wild wildlife