|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.
|N. Allaire et al. 2017||Rhopalocystis with a large-sized theca, composed of one basal, one circlet of infralaterals (four plates) exhibiting one to three, more or less sharp protuberances (umbo); numerous laterals that can have a spine-shaped umbo; usually three circlets of radials (the first and the second radials are elongate and spine-shaped; the third radial is convex).|