|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Somasteroidea - Archegonasteridae
It was assigned to Somasteroidea by Spencer (1951); to Goniactinida by Owen (1965), Spencer and Wright (1966) and Blake (1989); and to Somasteroida by Dean Shackleton (2005).
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|W. K. Spencer 1951||Somasteroidea with bodies bounded by a stout margin frame, approximately pentagonal in outline, rows of virgalia confined to wedge-shaped area within the outer angles of the pentagon, proximal tube feet were buccal tentacles. Adambulacralia present.|