✳Sea Urchin External Anatomy✳ 🌊 🦔 🥢🤏🏽 Marvelous close up video showing the ventral or oral surface anatomy of a living sea urchin. The stiff, tapering structures with longitudinal ridges are the primary and secondary spines. Also moving about are pedicellariae. These appendages range in size from very tiny to about as large as some of the secondary spines. Pedicellariae are used by the urchin for defense and cleaning and look like diminutive unopened tulips with transparent stems. The termi
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✳Sea Urchin External Anatomy✳ 🌊 🦔 🥢🤏🏽 Marvelous close up video showin…
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