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Articulata , Articulata 1. (phylum Brachiopoda) A class of brachiopods in which the calcareous valves are impunctate, punctate, or pseudo-punctate. The fibrous or… Pennatulacea , Pennatulacea (sea pens; class Anthozoa, subclass Octocorallia) An order of colonial octocorals that have an elongate primary polyp embedded in mud on… Sea Squirts , Ascidiacea (sea squirts; subphylum Urochordata) A class of sea squirts, most of which inhabit shallow waters where they attach themselves to such str… Holothuroidea , Holothuroidea (sea cucumbers; phylum Echinodermata, subphylum Echinozoa) A class of worm-like echinoderms which may be free-living or attached. The m… Thecosomata , Thecosomata (shelled pteropods; phylum Mollusca, class Gastropoda) An order of opisthobranch gastropods which have a planktonic mode of life, aided b… sea pen , sea pen See ANTHOZOA; and PENNATULACEA.
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