Sea urchin - Wikipedia
网页Their tests (hard shells) are round and spiny, typically from 3 to 10 cm (1 to 4 in) across. Sea urchins move slowly, crawling with their tube feet, and sometimes pushing themselves with their spines. They feed primarily on algae but also eat slow-moving or sessile animals. Their predators include sea otters, starfish, wolf eels, and triggerfish.
Sea urchin | Description, Anatomy, & Facts | Britannica
网页2024年7月31日 · Lytechinus variegatus, a pale-greenish urchin of the southeastern coast of the United States and the Caribbean, and the large, short-spined Psammechinus (sometimes Echinus) miliaris of Iceland, Europe, and western Africa use their tube feet to hold up bits of seaweed or shell as a shield against sunlight in shallow water.
Sea Urchin Anatomy - Ask A Biologist
网页2015年8月22日 · Sea Urchin Anatomy. One look at a sea urchin and you can see why they would be called sea hedgehogs. They have hard rounded shells covered with sharp movable spines. Urchins are part of the phylum Echinoderm and their name comes from Ancient Greek (echinos meaning "hedgehog" and derma meaning "skin").
Sea Urchin - Description, Habitat, Image, Diet, and Interesting Facts
网页Pedicellaria – In addition to their formidable spines, sea urchins have tiny claws on the surface of their shells in between their spines. These tiny claws are believed to aid the sea urchin in clearing debris, algae, and parasites from their shells.
Discover The Shell Of A Sea Urchin: Structure, Functions, And …
网页2024年8月12日 · Learn about the unique features and functions of sea urchin shells, including their porous calcium carbonate secretion, spiral pattern formation, and flexible yet robust composition.
Sea urchins: Strange and spiny wonders of the ocean
网页From a fascinating symmetrical structure to deadly-looking spines, unique mouthparts and clever techniques for moving about on the seafloor, discover the extraordinary world of sea urchins. What is a sea urchin? Sea urchins belong to a group of marine invertebrates called Echinodermata, which means spiky-skinned.
A Simple Guide to Sea Urchins | Pangea Shellfish Company
网页2018年11月27日 · Sea urchins are echinoderms most closely related to sea cucumbers and sea stars. Their spherical shells, or tests, are made up of plates and movable spines that protect them from predators. There are about 950 species of sea urchins that inhabit a wide range of depth zones in all climates across the world’s oceans.
Stop Sea-Urching, Here’s Everything You Need to Know About Sea …
网页2020年7月29日 · Hidden beneath their spines they have a hard, outer skeleton called a test. If you’ve ever walked along the beach and seen a circular purple, white or green-ish shell with dots all over it, it might be a sea urchin test! Each raised dot represents where there used to be a spine when the urchin was alive.
Sea Urchin: The Marine Invertebrate - Ocean Info
网页Sea urchins are small, spiny, globular animals that live in the sea. They are found in all oceans, from the tropics to the poles. Sea urchins are related to sand dollars, starfish, and sea cucumbers. They are important members of the marine ecosystem and are often used as a food source by humans.
What are sea urchins? A guide to the fascinating ... - Discover …
网页Learn how sea urchins use calciumcarbonate to build their spiny shells and amazing adaptations to survive in the ocean.
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