|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Helcionelloida - Helcionellida - Helcionellidae
It was assigned to Scenellidae by MacKinnon (1985); to Mollusca by Sepkoski (2002); to Helcionellidae by Parkhaev (2002) and Gubanov et al. (2004); and to Yangtzeconinae by Parkhaev and Demidenko (2010).
Is something missing? Join the Paleobiology Database and enter the data
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.
|P. Y. Parkhaev and Y. Demidenko 2010||"Shell cap-shaped, high conical, rarely of medium height, moderately compressed laterally. Apex position central or subcentral. Anterior field slightly convex or straight in apical part, becomes noticeably concave towards aperture. Posterior field almost straight or convex, can be slightly concave in apical part. Aperture oval. Apertural margin simple, without flaring and sinuses. Ornamentation represented by prominent concentric ribs. Protoconch separated from teleoconch by oblique furrow, axis of protoconch forms angle with axis of teleoconch."|