|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||Rosetted trace, up to 16 cm in diameter, fairly structureless central area (4 to 6 cm in diameter) surrounded by an aureole of ribs, variable in length, which always point outward; central area may possess a central knob.|