Basic info Taxonomic history Classification Relationships
Morphology Ecology and taphonomy   Age range and collections

Absidaticonus

Helcionelloida - Helcionellida - Helcionellidae

Synonyms
Synonymy list
YearName and author
1985Yangtzedonta Yu p. 403
2002Absidaticonus Sepkoski, Jr.
2010Absidaticonus Parkhaev and Demidenko p. 1035

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
Schizocoela
RankNameAuthor
phylumMollusca
classHelcionelloidaPeel 1991
orderHelcionellida
superfamilyHelcionelloidea(Wenz 1938)
familyHelcionellidae
genusAbsidaticonus

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.

Diagnosis
ReferenceDiagnosis
P. Y. Parkhaev and Y. Demidenko 2010"Shell cap-shaped, low conical, elongated to different extent. Apex hooked downwards and displaced posteriorly, projecting over posterior apertural margin. Anterior field evenly convex, becomes gently convex near aperture. Posterior field very short, concave below apex, flattens towards aperture. Lateral fields moderately convex. Aperture irregularly oval or pyriform, its posterolateral flanks slightly pulled, forming small 'auricles'. Posterior apertural margin with subapical angulation. Exterior shell ornamentation represented by growth lines. Surface of internal mold smooth or with concentric wrinkles."