|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
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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.
|A. Williams et al. 1996||Brachiopods with calcitic, laminar (tabular) inarticulated shells; valves developed discretely without mantle reversal; larvae lecithotrophic without shell; posterior body wall complete, pedicle not developed, ventral valve attached by larval epithelium; muscle system with a single pair of internal obliques and with paired outside lateral muscles attached anteriorly to the body wall; alimentary tract more or less axial with anus; lophophore initially with median tentacle lost during growth, tentacles in double row in posttrocholophous growth stages only; paired ganglia developed; mantle canal systems without interiomedial vascula terminalia, normally pinnate, containing gonads.|