|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.
|P. A. Cohen and A. H. Knoll 2012||Scales imperforate, all of one morphol- ogy and approximate size. Outline elliptic, very slightly domed when observed in side view. Cluster exhibits overlapping of scales in more than one direction. Emended: Scales imperforate, outline elliptic to circular, very slightly domed when observed in side view. Cluster exhibits overlapping of scales in more than one direction.|