|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Rhynchonellata - Atrypida - Lissatrypidae
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 1986||Small, smooth or anteriorly corrugated, planoconvex to biconvex, sulcate to rectimarginate shell with simple medially or vertically oriented spiralia normally of two whorls or less, and a simple, whole or partially developed anterior or oentral-dorsal jugum.|