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Echinodermata are so named owing to their spiny skin (from the Greek echinos meaning spiny and dermos meaning skin). This phylum is a collection of about 7,000 described living species. Echinodermata are exclusively marine organisms.
What Domain, Kingdom and Phylum does this belong to? porifera cnidarians flatworms mollusks annelids nematodes arthropods echinoderms chordates Origin of multicellularity