Sea urchin - Wikipedia
About 950 species live on the seabed, inhabiting all oceans and depth zones from the intertidal zone to deep seas of 5,000 m (16,000 ft). [1] . They typically have a globular body covered by …
Sea Urchin - Types, Anatomy, Classification, Reproduction
Sep 4, 2025 · Their bodies are encased in a hard shell called the test, which contains numerous spines and pores that allow their tube feet to extend outwards. Currently, about 950 species of …
25 Types of Sea Urchins - Names of Sea Urchin Varieties
Apr 1, 2025 · 25 Types of sea urchins. Did you know that there are more than 950 species of sea urchin? Sea urchins can be regular or irregular. We look at some of the most common sea …
Sea Urchin Anatomy - Ask A Biologist
Aug 22, 2015 · 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 …
Sea urchin | Description, Anatomy, & Facts | Britannica
Oct 7, 2025 · Lytechinus variegatus, a pale-greenish urchin of the southeastern coast of the United States and the Caribbean, and the large, short-spined Psammechinus (sometimes …
Why Are Sea Urchins Covered In Shells?
Jul 6, 2023 · Sea urchin shells serve several crucial purposes in their survival and adaptation to their marine environments. The primary function of sea urchin shells is protection. The hard, …
Sea urchins: Strange and spiny wonders of the ocean
Sea urchins are globe-shaped creatures that live on the ocean floor. Many beachgoers have had the misfortune to feel a sting from their spines, but how much do you know about the lives of …
Discover The Shell Of A Sea Urchin: Structure, Functions, And …
Aug 12, 2024 · 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.
Nautical Crush Trading Sea Urchins Shells for Air Plants - 25 Pink …
These vibrant shells for decoration are ideal for air plant hangers, beach garden decor, and creating unique seashell decorations for any space. ENDLESS COASTAL CHARM – Add a …
Sea Urchin Shells | Real Sun-Bleached Seashells for Crafts
Shop real Sea Urchin shells, sustainably collected from Maine. Each unique shell is perfect for beach crafts, weddings, coastal décor, and DIY art projects.