|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Strophomenata - Strophomenida - Christianiidae
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.
|C. M. O. Rasmussen et al. 2012||Shell medium sized, concavo-convex in profile, elongate to subquadrate in outline. Delthyrium open, partly covered by pseudodeltidium. Notothyrium open, wide. Chilidium absent. Valves are smooth but lamellose. Short ventral median septum. Dorsal median septum weak to absent.|