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Slate pencil sea urchin

Slate pencil sea urchin (Heterocentrotus sp.) on a reef. The sea urchin is a marine invertebrate of the phylum Echinodermata that includes starfish. Like a starfish, a sea urchin has five-fold radial symmetry. The arms have fused to form a spherical shell from which protective spines protrude. Here, the spines are thick to withstand the turbulent water of its shallow water habitat. This urchin is named for the fact that its spines were used to write on blackboards. A sea urchin uses tube feet on its underside to crawl over rocks. Its mouth is also on its underside, and its five jaws scrape up algae (microscopic plants) growing on the rock. Photographed at the Ras Mohammed National Park, Red Sea, Sinai, Egypt,

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Filename: HN_Underwater_4835.jpg
Image Size: 5120x3401 / 3.2MB; https://archive.photostock-israel.com/terms; https://archive.photostock-israel.com/contact; Slate pencil sea urchin Heterocentrotus sp Coral Reef scuba diving underwater ocean sea Ras Mohammed marine dive nature coral reef marine life corals Ras Mohammad Underwater photography Egypt Middle East Heterocentrotus mammillatus Mideast Sinai Animals Saltwater Animal Coralfish Coral Polyp Polyp Coral Reefs Reefs Red Sea Sea Marine Flora Marine Life Aquatic Sealife Under water Wildlife Tropical Ecosystem Biology Deep-sea Deep sea Deepsea nobody Psi Hnativ
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Slate pencil sea urchin (Heterocentrotus sp.) on a reef. The sea urchin is a marine invertebrate of the phylum Echinodermata that includes starfish. Like a starfish, a sea urchin has five-fold radial symmetry. The arms have fused to form a spherical shell from which protective spines protrude. Here, the spines are thick to withstand the turbulent water of its shallow water habitat. This urchin is named for the fact that its spines were used to write on blackboards. A sea urchin uses tube feet on its underside to crawl over rocks. Its mouth is also on its underside, and its five jaws scrape up algae (microscopic plants) growing on the rock. Photographed at the Ras Mohammed National Park, Red Sea, Sinai, Egypt,