|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Rhynchonellata - Terebratulida - Dielasmatidae
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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.
|K. S. W. Campbell 1965||Shells small to moderate in size for terebratuloids; pedicle valve evenly convex transversely, or flattened, or broadly sinuate; umbo sub-erect to erect; foramen labiate; umbonal ridges rounded to sub-angular; anterior and lateral commissures broadly sinuate; dental lamellae present; outer hinge plates attached to inner socket ridges; inner hinge plates meeting floor of valve separately, or forming a sessile sepatlium, or more rarely forming a normal septalium on a low septum; density of puncate averages 250 per sq. mm.|