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Echinoidea, commonly known as sea urchins, are fascinating creatures found in various marine environments. One species, Tylocidaris clavigera, showcases intricate spines that provide protection and aid in movement across the ocean floor. Another remarkable echinoid is Temnocidaris sceptrifera, a fossilized specimen that offers insights into the ancient history of these organisms. Crinoids, often referred to as feather stars or sea lilies, are close relatives of echinoids. These delicate creatures display stunningly beautiful arms adorned with feathery structures used for filter-feeding. The mouth of the Common Sea Urchin (Echinus esculentus) reveals its unique feeding apparatus called Aristotle's lantern. This complex structure allows them to scrape algae and other organic matter from rocks and surfaces. In Cornwall, UK, one can stumble upon Common Sea Urchin shells washed ashore. These remnants serve as a reminder of the diverse marine life inhabiting our oceans. Micraster coranguinum and Conulus albogalerus are two types of Shepherd's Crown echinoids known for their distinctive appearance resembling crowns or hats. Their intricate patterns make them sought-after collectibles among enthusiasts. A captivating symbiotic relationship can be observed between Coleman shrimps (Periclimenes colemani) and fire urchins (Asthenosoma varium). Living together within the spiky embrace of these venomous sea urchins provides both protection and food sources for these small crustaceans. Slate pencil sea urchins (Heterocentrotus mammillatus) create mesmerizing scenes on coral reefs worldwide. Their vibrant colors contrast against the backdrop of colorful corals while they play an essential role in maintaining reef ecosystems' balance.