|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Helcionelloida - Helcionellida - Helcionellidae
It was assigned to Scenellidae by Runnegar and Jell (1976) and Voronin et al. (1982); to Cyrtonellida by Bengtson (1992); to Helcionellidae by Rozanov et al. (1969), Missarzhevsky (1989) and Parkhaev (2002); and to Helcionelloida by Sepkoski (2002).
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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.