Alternative spellings: Somasteroidea, Somasteroidea, Somasteroidea

Full reference: W. K. Spencer. 1951. Early Palaeozoic starfish. Philosophical Transactions of the Royal Society of London, series B 235(B623):87-129

Parent taxon: Asterozoa according to J. Dean Shackleton 2005

Sister taxa: Asteroidea, Eopentaroida, Ophiuroidea, Phragmactis, Auluroidea

Subtaxa: Archegonasteridae, Chinianasteridae, Goniactinida

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Ecology: epifaunal suspension feeder