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 their spines. They feed primarily on algae but also eat slow-moving or sessile animals.
Sea Urchin Anatomy - Ask A Biologist
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, Anatomy, & Facts | Britannica
2024年11月12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.
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 shells helps us appreciate the intricate adaptations and ecological roles of …
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 among the spines help them move slowly along the ocean floor.
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. What is a sea urchin? Sea urchins belong to a group of marine invertebrates called Echinodermata, which means spiky-skinned.
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 provides protection. Sea urchins have a water vascular system that aids in …
U is for Urchin - National Aquarium
2018年5月7日 · A sea urchin's spines surround its round inner shell, called a test, and rotate on ball-and-socket joints. They are coated in cilia, tiny hair-like structures, that wave to create a water current carrying food to the urchin's mouth and washing away waste.
Sea Urchin: The Marine Invertebrate - Ocean Info
They are best known for their round, spiny, spherical shells called ‘tests.’. These sea animals have spines, which they use to protect themselves from predators and cling to rocks and other surfaces as they crawl along the ocean floor.
Discover The Shell Of A Sea Urchin: Structure, Functions, And …
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.