The Somasteroidea, or Stomasteroidea, is an extinct order of asterozoan echinoderms first defined in 1951 by W. K. Spencer. Their first appearance in the fossil record was in the Early Ordovician (Tremadocian) and they had become extinct by the Late Devonian (Famennian). They are similar to the asteroids in that their bodies are flattened dorsoventrally and they have five petaloid arms with broad bases. The ambulacral plates in somasteroids are simple and unspecialized, and the arms were thought to be not flexible and were unable to assist in feeding, but the oral mouth parts were more complex. According to the World Register of Marine Species, Stelleroidea is no longer considered valid and it has since been absorbed into Somasteroidea and Asterozoa.
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| - Somasteroïdeus (ca)
- Somasteroidea (es)
- Somasteroidea (fr)
- Somasteroidea (en)
- Somasteroidea (pt)
- Somasteroidea (sv)
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| - Els somasteroïdeus (Somasteroidea) són una classe d'equinoderms fòssils del subembrancament Asterozoa, similars a les estrelles del mar. Depenent de la classificació, es tracta d'un grup paleozoic extint (hipòtesi defensada per les publicacions més recents), o una classe que només conté una espècie actual (hipòtesi obsoleta per les dades genètiques modernes). (ca)
- Los somasteroideos (Somasteroidea) son una clase de equinodermos fósiles del subfilo Asterozoa, parecidos a las actuales estrellas de mar y ofiuras. Dependiendo de la clasificación, es un grupo paleozoico extinto (una hipótesis defendido por las publicaciones más recientes), o una clase que contiene solo una especie actual (hipótesis obsoleta por los datos genéticos modernos). (es)
- Somasteroidea est le nom d'une classe d'échinodermes disputée. Selon les classification, il s'agit soit d'un groupe éteint du Paléozoïque (conception défendue par les publications les plus récentes), soit d'une classe actuelle ne contenant qu'une seule espèce contemporaine (hypothèse rendue obsolète par les données génétiques modernes). (fr)
- The Somasteroidea, or Stomasteroidea, is an extinct order of asterozoan echinoderms first defined in 1951 by W. K. Spencer. Their first appearance in the fossil record was in the Early Ordovician (Tremadocian) and they had become extinct by the Late Devonian (Famennian). They are similar to the asteroids in that their bodies are flattened dorsoventrally and they have five petaloid arms with broad bases. The ambulacral plates in somasteroids are simple and unspecialized, and the arms were thought to be not flexible and were unable to assist in feeding, but the oral mouth parts were more complex. According to the World Register of Marine Species, Stelleroidea is no longer considered valid and it has since been absorbed into Somasteroidea and Asterozoa. (en)
- Somasteroidea är en utdöd klass av tagghudingar. Somasteroidea ingår i fylumet tagghudingar och riket djur. Klassen innehåller bara ordningen Goniactinida. Klassens medlemmar uppkom under äldre ordovicium och de dog ut under devon. De var avplattade och hade fem segment så att de liknade en femhörning eller en stjärna. Uppskattningsvis levde arterna i havet och det antas att de hade viss förmåga till rörelse. (sv)
- Somasteroidea é uma classe de equinodermes da qual apenas se conhece uma espécie extante. Algumas correntes taxonómicas consideram a classe como extinta. (pt)
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| - Tremadocian to Famennian (en)
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| - Holotype of Villebrunaster fezouataensis, a basal member of the Somasteroidea (en)
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| - *Archegonasteridae (Spencer, 1951)
*Archophiactinidae? (Spencer, 1927)
*Catervaparmasteridae (Blake, 2000)
*Chinianasteridae (Spencer, 1951)
*Helianthasteridae? (Owen, 1965)
*Villebrunasteridae (Fell, 1963) (en)
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| - * Stelleroidea (Gregory, 1900 ) (en)
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| - Els somasteroïdeus (Somasteroidea) són una classe d'equinoderms fòssils del subembrancament Asterozoa, similars a les estrelles del mar. Depenent de la classificació, es tracta d'un grup paleozoic extint (hipòtesi defensada per les publicacions més recents), o una classe que només conté una espècie actual (hipòtesi obsoleta per les dades genètiques modernes). (ca)
- Los somasteroideos (Somasteroidea) son una clase de equinodermos fósiles del subfilo Asterozoa, parecidos a las actuales estrellas de mar y ofiuras. Dependiendo de la clasificación, es un grupo paleozoico extinto (una hipótesis defendido por las publicaciones más recientes), o una clase que contiene solo una especie actual (hipótesis obsoleta por los datos genéticos modernos). (es)
- Somasteroidea est le nom d'une classe d'échinodermes disputée. Selon les classification, il s'agit soit d'un groupe éteint du Paléozoïque (conception défendue par les publications les plus récentes), soit d'une classe actuelle ne contenant qu'une seule espèce contemporaine (hypothèse rendue obsolète par les données génétiques modernes). (fr)
- The Somasteroidea, or Stomasteroidea, is an extinct order of asterozoan echinoderms first defined in 1951 by W. K. Spencer. Their first appearance in the fossil record was in the Early Ordovician (Tremadocian) and they had become extinct by the Late Devonian (Famennian). They are similar to the asteroids in that their bodies are flattened dorsoventrally and they have five petaloid arms with broad bases. The ambulacral plates in somasteroids are simple and unspecialized, and the arms were thought to be not flexible and were unable to assist in feeding, but the oral mouth parts were more complex. According to the World Register of Marine Species, Stelleroidea is no longer considered valid and it has since been absorbed into Somasteroidea and Asterozoa. (en)
- Somasteroidea är en utdöd klass av tagghudingar. Somasteroidea ingår i fylumet tagghudingar och riket djur. Klassen innehåller bara ordningen Goniactinida. Klassens medlemmar uppkom under äldre ordovicium och de dog ut under devon. De var avplattade och hade fem segment så att de liknade en femhörning eller en stjärna. Uppskattningsvis levde arterna i havet och det antas att de hade viss förmåga till rörelse. (sv)
- Somasteroidea é uma classe de equinodermes da qual apenas se conhece uma espécie extante. Algumas correntes taxonómicas consideram a classe como extinta. (pt)
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| - * Stelleroidea (Gregory, 1900 (in part)
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