ECHINODERMS Meaning and
Definition
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Echinoderms are a phylum of marine invertebrates characterized by a spiny or prickly skin. The term "echinoderm" is derived from the Greek words "echinos," meaning "hedgehog," and "derma," meaning "skin." This name accurately describes the external appearance of these organisms, which possess a unique calcified endoskeleton covered in tiny spines or tubercles.
Echinoderms encompass a diverse group of animals, including sea stars (starfish), sea urchins, sea cucumbers, brittle stars, and sea lilies. They are exclusively marine and can be found in oceans across the globe, from the shallowest coastal waters to the deepest trenches. Echinoderms are notable for their radial symmetry, with most species having multiple arms or appendages radiating from a central body region.
These organisms play vital ecological roles in marine ecosystems. Sea stars, for example, are considered important predators, feeding on small organisms like mollusks and barnacles, while sea urchins serve as grazers, consuming algae and maintaining the balance of underwater plant communities. Additionally, echinoderms are significant in sediment turnover and nutrient recycling processes.
Despite their prickly appearance, many echinoderms are cherished for their beauty and uniqueness. Numerous species are popular in marine aquariums and are studied to better understand their intriguing biology, physiology, and regenerative capabilities. The study of echinoderms, known as echinodermatology, encompasses various scientific disciplines, including zoology, marine biology, and paleontology.
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A numerous class of radiata, like the starfish and sea-urchin, all less or more covered with a firm crustaceous substance, often densely armed with spines.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
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Etymology of ECHINODERMS
The word "echinoderms" has its etymology rooted in Ancient Greek. It is derived from the combination of two Greek words: "echinos" meaning "hedgehog" and "derma" meaning "skin". The term "echinoderms" was coined due to the spiny or prickly appearance of these marine animals, resembling the skin of a hedgehog.
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