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2. Sea urchin - Wikipedia

   en.wikipedia.org/wiki/Sea_urchin

   Sea urchins or urchins (/ ˈ ɜːr tʃ ɪ n z /) are typically spiny, globular animals, echinoderms in the class Echinoidea. About 950 species live on the seabed, inhabiting all oceans and depth zones from the intertidal to 5,000 metres (16,000 ft; 2,700 fathoms). [1]

3. Sand dollar - Wikipedia

   en.wikipedia.org/wiki/Sand_dollar

   Sand dollars (also known as sea cookies or snapper biscuits in New Zealand and Brazil, or pansy shells in South Africa) are species of flat, burrowing sea urchins belonging to the order Clypeasteroida. Some species within the order, not quite as flat, are known as sea biscuits. Sand dollars can also be called "sand cakes" or "cake urchins". [2]

4. Strongylocentrotus droebachiensis - Wikipedia

   en.wikipedia.org/wiki/Strongylocentrotus...

   The water vascular system is a series of canals through which fluid moves to help propel the podia of the sea urchin. The fluid that fills the water vascular system is similar to marine water, but also has free wandering cells and organic compounds such as proteins and a high concentration of potassium ions when compared to the surrounding sea ...

5. Diadema antillarum - Wikipedia

   en.wikipedia.org/wiki/Diadema_antillarum

   Diadema antillarum has a "shell," similar to most other sea urchins. What distinguishes the Diadema is the length of its spines. Most sea urchin spines are 1–3 cm, but the spines in this species are usually 10–12 cm in length, and can grow as long as 30 cm in very large individuals.

6. Phyllacanthus imperialis - Wikipedia

   en.wikipedia.org/wiki/Phyllacanthus_imperialis

   Phyllacanthus imperialis, also known as the Sputnik urchin, imperial lance urchin, imperial sea urchin, imperial urchin, pencil sea urchin, lance urchin, knobby sputnik sea urchin, mine urchin, and land mine sea urchin, is a species of sea urchins in the family Cidaridae. [2] Test (shell) It has distinctive thick, blunt spikes. The test is ...

7. Sea urchin die-off threatens reefs from Florida to Caribbean ...

   www.aol.com/news/sea-urchin-die-off-threatens...

   These days, long-spined sea urchins are known as the gardeners of the sea. They tend the algae on the coral reefs they call home, making sure it never overwhelms their hosts. Spotting one on the ...