|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Asteroidea - Platyasterida
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.
|D. B. Blake and T. E. Guensburg 1989||Five-armed asteroid, arms long, gradually tapered, disk small, flat; true paxillae present, bearing spoon- or fan-shaped spines; marginals not obviously differentiated; adambulacral large, broad, short, separated by well-defined interadambulacral channels; ambulacrals very small; adambulacrals, ambulacrals paired (not offset), podial pores lacking.|