|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Strophomenata - Strophomenida - Christianiidae
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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.
|A. Williams 1962||Elongately quadrate and auriculate Christiania with the anterior and postero-median portions of the valves strongly concavo-convex but flattening out postero-laterally to form a pair of plane triangular areas; ornamentation including well-developed concentric growth-lines and fine radial costellae; dental lamellae narrowly divergent and almost one-third as long as the pedicle valve; dorsal septa straight and subparallel; adductor muscle-scars confined anteriorly by a pair of curved ridges and divided obliquely by a pair of low divergent ridges.|