|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Lingulata - Acrotretida - Scaphelasmatidae
It was assigned to Acrotretinae by Cooper (1956); to Scaphelasmatinae by Holmer (1986) and Holmer (1989); to Acrotretida by Sepkoski (2002); and to Scaphelasmatidae by Williams et al. (2000), Popov (2000) and Hansen and Holmer (2011).
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.