|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Rhynchonellata - Athyridida - Anoplothecidae
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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. J. Boucot and J. G. Johnson 1967||Large for the genus; flatly concavo- convex, ventral flanks may be concave; costae numerous, bifurcating anteriorly, tending to disintegrate at periphery of large shells, medial costae only faintly differentiated; ventral diductors elongate, not elevated on a platform.|