|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Rhynchonellata - Orthida - Platyorthidae
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.
|B. G. Baarli 1988||Planoconvex and subcircular with fine multicostellae. Adductor scars of pedicle valve visible and not enclosed by the diductor scars. Brachiophores small, slender, and very divergent. No socket pads. Dorsal muscle scars very faintly or not impressed, with posterior muscle scars smaller than anterior. Costellae impressed over the entire interior of the valve.|