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Helcionella

Helcionelloida - Helcionellida - Helcionellidae

Synonyms
Synonymy list
YearName and author
1899Pseudotheca Redlich
1909Helcionella Grabau and Shimer
1938Helcionella Wenz
1960Helcionella Knight et al. p. 172
1976Helcionella Runnegar and Jell p. 117
1992Helcionella Bengtson p. 1027
2000Helcionella Feng et al. p. 373
2002Helcionella Parkhaev p. 34
2002Helcionella Sepkoski, Jr.
2004Helcionella Gubanov et al. p. 207
2005Helcionella Bouchet et al. pp. 86, 241
2010Helcionella Parkhaev and Demidenko p. 1021
2016Helcionella Jacquet and Brock

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

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 and relatively wide, very rapidly expands from apex towards aperture. Apex hooked and displaced posteriorly, lying near posterior apertural margin. Aperture widely oval, without sinuses. Shell ornamentation represented by concentric ribs and folds, prominent to various extent; faint radial ornamentation can be also observed."