|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Rhynchonellata - Orthida - Giraldiellidae
It was assigned to Plectorthidae by Williams (1951); to Giraldiellidae by Williams et al. (2000); and to Orthida by Sepkoski (2002).
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 1951||Multicostellate subequally convex or resupinate orthids with the dorsal valve more convex than the ventral. Internally with a plectorthid cardinalia except for a linear cardinal process, and a short undifferentiated|