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2. Diadema paucispinum - Wikipedia

   en.wikipedia.org/wiki/Diadema_paucispinum

   Diadema paucispinum is a small sea urchin with very long, moveable spines which are slender and sharply pointed. They can be up to 25 cm (10 in) long and about four times the diameter of the test. The primary spines are bluish-black in colour, often with pale bands in younger individuals.

3. Echinothrix calamaris - Wikipedia

   en.wikipedia.org/wiki/Echinothrix_calamaris

   The banded sea urchin has a slightly oval test (shell), reaching a diameter of about 5 cm. [1] Like almost all the Diadematidae (but it is in Echinothrix calamaris that it is most obvious) it has two different sets of spines, short and slender closed spines which go from yellow to dark (through brown) in colour and can deliver a nasty sting, and longer and thicker spines that are often banded ...

4. Asthenosoma varium - Wikipedia

   en.wikipedia.org/wiki/Asthenosoma_varium

   Close-up of Asthenosoma varium, showing distinctive spines. Asthenosoma varium is a large sea urchin, hemispherical in shape, and growing to a diameter of 25 cm (10 in). The plates from which the test is formed are not joined rigidly together, as is the case in most sea urchins. [2]

5. Mysterious plague is wiping out sea urchins across the globe ...

   www.aol.com/mysterious-plague-wiping-sea-urchins...

   Expert warns urchins vital to coral reef ecosystems now ‘functionally extinct’ in Red Sea Mysterious plague is wiping out sea urchins across the globe, scientists say Skip to main content

6. 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.

7. As coral reefs face unprecedented heat, scientists experiment ...

   www.aol.com/news/coral-reefs-face-unprecedented...

   Record-breaking sea surface temperatures have persisted globally since March 2023. ... The group was installing suspended homes for baby Diadema antillarum — a long-spined sea urchin — a ...