|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Strophomenata - Orthotetida - Areostrophiidae
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.
|G. A. Cooper and J. T. Dutro 1982||Medium sized costellate shells having ventral valve deeper and more convex than the flat or nearly flat dorsal valve. Interareas unequally developed. Brachiophores contained in cuplike sockets.|