List of echinodermata orders

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A brittle star, Ophionereis reticulata
A sea cucumber from Malaysia
Starfish exhibit a wide range of colours
Sunflower star regenerating several arms

List of echinodermata 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

Class Crinoidea

Crinoid

Class Paracrinoidea

No orders, 13 to 15 genera are known.

Class Cystoidea

File:Haeckel Cystoidea.jpg
Haeckel Cystoidea

No orders known.

Class Edrioasteroidea

No orders known.

Subphylum Asterozoa

Class Ophiuroidea (Brittle stars)

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Class Asteroidea (Starfish)

Subphylum Echinozoa

Class Echinoidea (Sea urchins)

Strongylocentrotus purpuratus, a well-armoured sea urchin

Class Holothuroidea (Sea cucumbers)

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Class Ophiocistioidea

No orders known.

Class Helioplacoidea

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

Subphylum Blastozoa

Gogia ojenai

Class Blastoidea

Class Eocrinoidea

Subphylum Homostelea

Class Homoiostelea

No orders known, four genus including Cothurnocystis.

Class Stylophora

Class Ctenocystoidea

References

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