Helicoplacoidea is an extinct class within the Echinodermata. All known taxa were discovered in sediments dating back to the Cambrian. Helicoplacoid skeletons...
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Ophiuroidea Asteroidea Echinozoa Echinoidea Holothuroidea Ophiocistioidea † Helicoplacoidea † Blastozoa † Blastoidea † Cystoidea † von Buch, 1846 Eocrinoidea †Jaekel...
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Phylum: Echinodermata Subphylum: Echinozoa Classes Echinoidea or sea urchins Holothuroidea or sea cucumbers Ophiocistioidea † Helicoplacoidea † † = Extinct...
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Helicoplacus (category Helicoplacoidea)
157-173. Durham, J.W., & Caster, K. E.; Caster, KE (17 May 1963). "Helicoplacoidea: A New Class of Echinoderms". Science. 140 (3568): 820–822. Bibcode:1963Sci...
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This List of echinoderm orders concerns the various classes and orders into which taxonomists categorize the roughly 7000 extant species as well as the...
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30 (1): 9–14. JSTOR 1300370. Durham, J. W.; Caster, K. E. (1963). "Helicoplacoidea: A New Class of Echinoderms". Science. 140 (3568): 820–822. Bibcode:1963Sci...
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List of echinodermata orders Calcichordate Theory Edrioasteroidea Helicoplacoidea Blastozoa Geggel, Laura (22 February 2019). "480-Million-Year-Old Mystery...
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Helicocystis (category Helicoplacoidea)
Helicocystis is a stalked, spiralling pentaradial echinoderm known from the Cambrian Jbel Wawrmast Formation. Smith, A. B.; Zamora, S. (2013). "Cambrian...
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