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List of echinoderm orders

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List of echinoderm orders
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This List of echinoderm orders concerns the various classes and orders into which taxonomists categorize the roughly 7000 extant species[1] as well as the extinct species of the exclusively marine phylum Echinodermata.

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A brittle star, Ophionereis reticulata
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A sea cucumber from Malaysia
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Starfish exhibit a wide range of colours.

Subphylum Crinozoa

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Class Crinoidea

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Crinoid
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Haeckel Cystoidea

Class Paracrinoidea

No orders, 13 to 15 genera are known.

  • order Comarocystitida
    • ?Family Heckeritidae
      • Heckerites
    • Family Amygdalocystitidae
      • Achradocystites † Volborth, 1870
      • Amygdalocystites † Billings, 1854 (= Ottawacystis) (?= Billingsocystis)
      • Oklahomacystis † Parsley & Mintz, 1975 (Bassler, 1943)
      • Ovulocystites † Frest et al., 1980
    • Family Comarocystitidae † Balther, 1899
      • Comarocystites † Billings, 1854
      • Implicaticystis
      • Sinclairocystis
  • order Platycystitida
    • Family Platycystitidae
      • Canadocystis † (= Sigmacystis)
      • Platycystites
    • Family Malocystitidae
      • Malocystites
      • Wellerocystis
    • Family Bistomiacystitidae
      • Bistomiacystis

Doubtful paracrinoids:

  • Columbocystis
  • Foerstecystis
  • Springerocystis
  • Ulrichocystis
  • Paleocystites
  • Allocystites

Class Cystoidea

  • order Aristocystitida
  • order Asteroblastida
  • order Glyptosphaeritida
  • order Sphaeronitida

Class Edrioasteroidea

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Streptaster vorticellatus (Edrioasteroidea)
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Subphylum Asterozoa

Class Ophiuroidea (Brittle stars)

Class Asteroidea (Starfish)

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Subphylum Echinozoa

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Class Echinoidea (Sea urchins)

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Strongylocentrotus purpuratus, a well-armoured sea urchin

Class Holothuroidea (Sea cucumbers)

Class Ophiocistioidea

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Euthemon

No orders recognized: class is divided up into four families, Eucladiidae, Sollasiniidae, Volchoviidae, and Rhenosquamidae. The inclusion of Rhenosquamidae within Ophiocistioidea is doubtful, as the organs identified in fossils of Rhenosquamus as the characteristic "scaly podia" otherwise diagnostic of ophiocistioids may not, in fact, be such structures.

Class Helicoplacoidea

No known orders, 2 known species, Helicoplacus curtisi and H. guthi

Subphylum Blastozoa

Class Blastoidea

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Blastoidea
  • Order Coronata
  • Order Fissiculata
  • Order Spiraculata
  • basal Macurdablastus

Class Eocrinoidea

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Gogia spiralis (Eocrinoidea)

Subphylum Homostelea / Homalozoa †

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Corthurnocystis, a Stylophora.

Class Ctenocystoidea

  • order Ctenocystida

Class Soluta

Class Cincta

Class Stylophora

References

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