|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Rhynchonellata - Spiriferinida - Syringothyrididae
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. B. Waterhouse 1966||Moderately but not extremely transverse, somewhat variable in outline, cardinal extremities obtuse at early growth stage, acute later, ventral umbo low, little incurved, moderately deep and wide sulcus, and high fold, without costae or median cleft.|