|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Rhynchonellata - Orthida - Orthidae
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.
|C. M. O. Rasmussen et al. 2012||Shell small, biconvex, with transversely lobate outline. Anterior commissure unisulcate. Cardinal angles obtuse. Interarea moderately high. Delthyrium high. Teeth flat and wide, supported by divergent dental plates. Dorsal interarea low, notothyrium open. Ornament costate. Brachiophores widely divergent. Notothyrial platform absent. Cardinal process small and thick.|