|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Paracrinoidea - Platycystitida - Platycystitidae
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.
|T. J. Frest et al. 1979||Theca amygdaloidal, compressed to broadly oval in outline, both arms reaching column, calluses prominent; 26 to 29 thecal plates; no intercalates. Peristome only slightly offset to left, periproct on posterior face near upper margin (adopted from Parsley & Mintz, 1975, p. 59).|