Sea urchin - Wikipedia
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 …
15 Types of Sea Urchins: Species, Identification, and Photos - TRVST
2024年4月16日 — The Long-Spined Sea Urchin, or Lime Urchin, inhabits coral reefs in the Atlantic Ocean’s shallow waters and coasts. Its thin spines can stretch up to four times the shell's …
Sea Urchin Anatomy - Ask A Biologist
2015年8月22日 — 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 …
Sea urchin | Description, Anatomy, & Facts | Britannica
2024年11月12日 — Sea urchin, any of about 950 living species of spiny marine invertebrate animals (class Echinoidea, phylum Echinodermata) with a globular body and a radial …
Sea urchins: Strange and spiny wonders of the ocean
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. …
Why Are Sea Urchins Covered In Shells?
2023年5月22日 — The shells provide protection, camouflage, and defense mechanisms, allowing sea urchins to thrive in diverse marine habitats. Understanding the significance of sea urchin …
Sea Urchin - A-Z Animals
2024年5月27日 — Sea urchins are small sea animals that have spherical shells called tests that are typically covered in spines similar to those of a porcupine. Very small tube-shaped feet …
Sea Urchin - Description, Habitat, Image, Diet, and Interesting Facts
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 …
Sea Urchin Anatomy: [Parts & Fossils] - Sea Urchins Mag
2023年5月11日 — Sea Urchin Characteristics: Sea urchins have a spherical or globular body shape covered in spines. They possess a hard, calcareous outer shell called a test, which …
Sea Urchin: The Marine Invertebrate - Ocean Info
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. …