|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Rhynchonellata - Orthida - Giraldiellidae
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 medium-sized, ventri-biconvex in profile and transverse, subcircular to subtrapezoidal in outline; shell alate in juvenile stages. Anterior commissure unisulcate. Ornamentation parvicostellate. Teeth large, supported by divergent dental plates. Diductor muscle scars bilobed, weakly impressed on callus. Cardinal process thick, bilobate, positioned on notothyrial platform resting on valve floor. Dorsal median septum short. Dental sockets deep; brachiophores low and divergent.|