List of echinoderm orders
A brittle star, Ophionereis reticulata
A sea cucumber from Malaysia
Starfish exhibit a wide range of colours
Sunflower star regenerating several arms
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
Class Crinoidea
Crinoid
- Subclass Articulata (540 species)
- Order Bourgueticrinida
- Order Comatulida
- Order Cyrtocrinida
- Order Isocrinida
- Order Millericrinida
- Subclass †Flexibilia
- Subclass †Camerata
- Subclass †Disparida
Class Paracrinoidea †
No orders, 13 to 15 genera are known.
Class Cystoidea †
Haeckel Cystoidea
No orders known.
Class Edrioasteroidea †
No orders known.
Subphylum Asterozoa
Class Ophiuroidea (Brittle stars)
See also: List of prehistoric brittle stars
- Order Oegophiurida
- Order Ophiurida
- Order Phrynophiurida
Class Asteroidea (Starfish)
- Infraclass Concentricycloidea
- Superorder Forcipulatacea
- Superorder Spinulosacea
- Superorder Valvatacea
- Velatida[2]
- † Calliasterellidae
- † Trichasteropsida
Subphylum Echinozoa
Class Echinoidea (Sea urchins)
Strongylocentrotus purpuratus, a well-armoured sea urchin
- 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
Class Holothuroidea (Sea cucumbers)
Euapta godeffroyi
See also: List of prehistoric sea cucumbers
- Order Apodida
- Order Aspidochirotida
- Order Dendrochirotida
- Order Elasipodida
- Order Molpadida
Class Ophiocistioidea †
No orders known.
Class Helioplacoidea †
No known orders, 2 known species, Helicoplacus curtisi and Helicoplacus guthi
Subphylum Blastozoa †
Gogia ojenai
Class Blastoidea †
- Order Fissiculata †
- Order Spiraculata †
- basal Macurdablastus †
Class Eocrinoidea †
- Order Gogiida †
Subphylum Homostelea †
Class Homoiostelea †
No orders known, four genus including Cothurnocystis.
References
- ↑ "Animal Diversity Web - Echinodermata". University of Michigan Museum of Zoology. Retrieved 26 August 2012.
- ↑ Sweet, Elizabeth (2005-11-22). "Asterozoa: Fossil groups: SciComms 05-06: Earth Sciences". University of Bristol. Retrieved 2008-05-07.
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