|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Gastropoda - Murchisoniina - Hormotomidae
It was reranked as Ptychocaulus by Knight et al. (1960), Sepkoski (2002) and Wagner (2017).
It was assigned to Murchisonia by Perner (1907); to Murchisoniidae by Knight et al. (1960); to Archaeogastropoda by Sepkoski (2002); and to Hormotomidae by Wagner (2017).
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.