|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
It was assigned to Phragmactidae by Spencer (1951) and Owen (1965); to Stenurida by Sepkoski (2002); to Asterozoa by Spencer (1940) and Dean Shackleton (2005); and to Phragmactinidae by Spencer and Wright (1966) and Blake (2014).
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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.
|J. Dean Shackleton 2005||Madreporite contacting inferomarginal ossicle; loss of aboral plating; axillary oval in shape.|
|D. B. Blake 2014||Phragmactinid lacking body-wall ossicles dorsal to marginals. Marginals in single series, their form shield-like. Axillary ventral, large, shield-like. Madreporite ventral in position but dorsal to marginal-axillary series. Podial pores lacking throughout arm length. Adambulacral forming an abradial rim to the ambulacral podial basin; adambulacrals broadest distally where abutting ambulacral transverse ridge, narrowing proximally. Ventral edge of MAO pair narrow, forming a possibly spine-bearing ridge.|