Encyclopedia of Life · EOL (see source)
Asterozoa
Sign in to saveThe Asterozoa are a subphylum in the phylum Echinodermata, within the Eleutherozoa. Characteristics include a star-shaped body and radially divergent axes of symmetry. The subphylum includes the classes Asteroidea (the starfish or sea stars), Ophiuroidea (the brittle stars and basket stars), Somasteroidea (early asterozoans from which the other classes most likely evolved), and Stenuroidea (early asterozoans with unclear relationships to extant classes). A fifth class, Concentricycloidea, was proposed for the unusual genus Xyloplax (sea daisies), but was later demoted to the status of infracla
Species
Subphylum
- PhylumEchinodermata
海星亞門（學名：Asterozoa）是動物界棘皮動物門之下的一個亞門，其下物種的特徵包括呈星形的身體和徑向發散的對稱軸。
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Encyclopedic overview
8 sectionsContents
- Taxonomy
- Distinguishing the classes
- Somasteroidea
- Stenuroidea
- Asteroidea
- Ophiuroidea
- References
- Works cited
The Asterozoa are a subphylum in the phylum Echinodermata, within the Eleutherozoa. Characteristics include a star-shaped body and radially divergent axes of symmetry. The subphylum includes the classes Asteroidea (the starfish or sea stars), Ophiuroidea (the brittle stars and basket stars), Somasteroidea (early asterozoans from which the other classes most likely evolved), and Stenuroidea (early asterozoans with unclear relationships to extant classes). A fifth class, Concentricycloidea, was proposed for the unusual genus Xyloplax (sea daisies), but was later demoted to the status of infraclass as the sister of Neoasteroidea within the asteroidean sublcass Ambuloasteroidea.
== Taxonomy ==
Excerpted from Wikipedia’s “Asterozoa” article, available under the CC BY-SA 4.0 licence.
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