|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Rhynchonellata - Atrypida - Protozygidae
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. Copper 1995||Elongate, ventribiconvex to biconvex, smooth, generally small, globose shell, rectimarginate to weakly sulcate; internally with medially directed spiralia of three or more whorls; simple U-shaped jugum located towards centrodorsal side of shell.|