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 such as crinoids …

Oct 7, 2025 · Sea urchins live on the ocean floor, usually on hard surfaces, and use the tube feet or spines to move about. In addition, a few carnivorous species have been described. The largest …

Sep 4, 2025 · Currently, about 950 species of sea urchins are found across the tropics to the polar regions, typically settling on the seabed. They usually crawl on their tube feet and search for algae, …

Nov 8, 2019 · Learn about sea urchins — spiny ocean animals with unique species, habitats, diet, predators, and a 465-million-year history.

Sea urchins belong to a group of marine invertebrates called Echinodermata, which means spiky-skinned. Animals in this group are known as echinoderms and include sea cucumbers, sea lilies, …

Enter the world of sea urchin and explore the diverse habitats and physical traits of these spiky creatures.

Sea urchins are small, spiky creatures found in various habitats, from shallow coral reefs to deep-sea trenches, and they play important roles in the ecosystems in which they live. Approximately 950 …

Aug 6, 2025 · Sea urchins are classified as echinoderms. Derm means skin, and akino means spiny or prickly. This is really fitting because sea urchins are covered in spines, and the word urchin actually …

Aug 27, 2025 · Sea urchins are marine invertebrates found across the world’s oceans, known for their distinctive spiny appearance. They inhabit a wide range of underwater environments, playing a part …

Jan 3, 2025 · Sea urchins are spiny, globe-shaped marine animals found in oceans worldwide. They belong to the phylum Echinodermata and play a vital role in marine ecosystems.