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List of echinoderm orders
From Wikipedia, the free encyclopedia
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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.



Subphylum Crinozoa
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Class Crinoidea
- Subclass Articulata (540 species)
- Order Bourgueticrinida
- Order Comatulida
- Order Cyrtocrinida
- Order Hyocrinida
- Order Isocrinida
- Order Millericrinida
- Subclass †Flexibilia
- Subclass †Camerata
- Subclass †Disparida
- Holopus sp. (Cyrtocrinida)
- Encrinus liliiformis (Encrinida)
- Calamocrinus diomedae (Hyocrinida)
- Liliocrinus polydactylus (Millericrinida)

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 †
- ?Family Heckeritidae †
- order Platycystitida †
- Family Platycystitidae †
- Canadocystis † (= Sigmacystis)
- Platycystites †
- Family Malocystitidae †
- Malocystites †
- Wellerocystis †
- Family Bistomiacystitidae †
- Bistomiacystis †
- Family Platycystitidae †
Doubtful paracrinoids:
- Columbocystis
- Foerstecystis
- Springerocystis
- Ulrichocystis
- Paleocystites
- Allocystites
Class Cystoidea
- order Aristocystitida
- order Asteroblastida
- order Glyptosphaeritida
- order Sphaeronitida
Class Edrioasteroidea †

- order Edrioasterida
- order Isorophida
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Subphylum Asterozoa
Class Ophiuroidea (Brittle stars)
- order Euryalida
- order Ophiurida
- order Amphilepidida
- order Ophiacanthida
- order Ophioleucida
- order Ophioscolecida
- Ophiolepis elegans (Amphilepidida)
- Ophioleuce seminudum (Ophioleucida)
- Ophiomyces frutectosus (Ophioscolecida)
Class Asteroidea (Starfish)
- Infraclass Concentricycloidea
- Superorder Forcipulatacea
- Superorder Spinulosacea
- Superorder Valvatacea
- Velatida[2]
- † Calliasterellidae
- † Trichasteropsida
- Cheiraster echinulatus (Notomyotida)
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Subphylum Echinozoa
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Class Echinoidea (Sea urchins)

- Superorder Diadematacea
- Order Diadematoida
- Order Echinothurioida
- Order Pedinoida
- Superorder Echinacea
- Order Arbacioida
- Order Echinoida
- Order Phymosomatoida
- Order Salenioida
- Order Temnopleuroida
- Superorder Gnathostomata
- Order Clypeasteroida (sand dollars)
- Order Holectypoida
- Superorder Atelostomata
- Order Holasteroida
- Order Spatangoida (heart urchins)
- Salenocidaris hastigera, a Salenioida
- Pourtalesia wandeli, a Holasteroida
- Maretia planulata, a Spatangoida
- Echinoneus cyclostomus, an Echinoneoida
- Echinolampas depressa, an Echinolampadoida
Class Holothuroidea (Sea cucumbers)
- Order Apodida
- Order Dendrochirotida
- Order Elasipodida
- Order Holothuriida
- Order Molpadida
- Order Persiculida
- Order Synallactida
- Cercodemas anceps (Dendrochirotida)
- Paracaudina australis (Molpadida)
- Hansenothuria benti (Persiculida)
Class Ophiocistioidea †

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 †

- Order Coronata †
- Order Fissiculata †
- Order Spiraculata †
- basal Macurdablastus †
Class Eocrinoidea †
- Order Ascocystida †
- Order Gogiida †
- Order Imbricata †
- Order Trachelocrinida †
Subphylum Homostelea / Homalozoa †

Class Ctenocystoidea †
- order Ctenocystida †
Class Soluta †
Class Cincta †
Class Stylophora †
References
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