|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||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.
|W. Hantzschel 1975||Starlike; circular or ellipitical rings consisting of 16 to 26 (20 on an average) cylindrical or spindle-shaped ribs of equal length or small roundish knobs encircling smooth flat central area; ribs or knobs rather regularly spaces or arranged; diameter of star 2 to 5 cm.|