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Paracrinoids, are extinct marine animals that make up the class Paracrinoidea of the echinoderms (phylum Echinodermata), and are closely related to crinoids. They lived in shallow seas during the Early Ordovician through the Early Silurian. Only 13 to 15 genera are known.

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  • Paracrinoid
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  • Paracrinoids, are extinct marine animals that make up the class Paracrinoidea of the echinoderms (phylum Echinodermata), and are closely related to crinoids. They lived in shallow seas during the Early Ordovician through the Early Silurian. Only 13 to 15 genera are known.
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  • Paracrinoids, are extinct marine animals that make up the class Paracrinoidea of the echinoderms (phylum Echinodermata), and are closely related to crinoids. They lived in shallow seas during the Early Ordovician through the Early Silurian. Paracrinoids are characterized by a mouth with two to five feeding arms arranged asymmetrically. They have a U-shaped gut, and their anus is located next to the mouth. They have irregularly shaped bodies (theca), and a stem, similar to crinoids, and may have used the stem to attach themselves to a substrate, although some reconstructions show them partially buried in sediment. Only 13 to 15 genera are known.
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