|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Rhynchonellata - Orthida - Heterorthidae
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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.
|J. Colmenar et al. 2014||Gently to strongly dorsibiconvex shell, transversely elliptical to circular in outline and with a short hinge line. Ornamentation finely costellate with ribs curved posterolaterally to intersect the hinge line. Ventral muscle field large, with flabellate diductor scars with short and rectangular adductor scars normally not enclosed anteriorly by diductors. Dorsal adductor scars quadripartite, with their posterior pair smaller than the anterior pair. Cardinal process strong with ovoid base and with trilobed myophore.|