|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
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 1984||Benthopectinid with low, conical abactinals bearing medial spine base, prominent articular digitation; flattened, rectangular marginals with single medial spine base; low ambulacrals with very long triangular ambulacral body, lacking enlarged ambulacral/adambulacral articular surface; podial pore large; adambulacrals elongate, rectangular, with large spine.|