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Helcionella
Taxonomy
Helcionella was named by Grabau and Shimer (1909) [Sepkoski's age data: V N-Da-u Cm Dres-l Sepkoski's reference number: 14,110,1030].
It was assigned to Cyrtonellida by Bengtson (1992); to Helcionelloida by Sepkoski (2002); to Scenellidae by Bouchet et al. (2005); to Helcionellinae by Parkhaev and Demidenko (2010); and to Helcionellidae by Wenz (1938), Knight et al. (1960), Runnegar and Jell (1976), Feng et al. (2000), Parkhaev (2002), Gubanov et al. (2004) and Jacquet and Brock (2016).
It was assigned to Cyrtonellida by Bengtson (1992); to Helcionelloida by Sepkoski (2002); to Scenellidae by Bouchet et al. (2005); to Helcionellinae by Parkhaev and Demidenko (2010); and to Helcionellidae by Wenz (1938), Knight et al. (1960), Runnegar and Jell (1976), Feng et al. (2000), Parkhaev (2002), Gubanov et al. (2004) and Jacquet and Brock (2016).
Species
Species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1899 | Pseudotheca Redlich |
| 1909 | Helcionella Grabau and Shimer |
| 1938 | Helcionella Wenz |
| 1960 | Helcionella Knight et al. p. 172 |
| 1976 | Helcionella Runnegar and Jell p. 117 |
| 1992 | Helcionella Bengtson p. 1027 |
| 2000 | Helcionella Feng et al. p. 373 |
| 2002 | Helcionella Parkhaev p. 34 |
| 2002 | Helcionella Sepkoski |
| 2004 | Helcionella Gubanov et al. p. 207 |
| 2005 | Helcionella Bouchet et al. pp. 86, 241 |
| 2010 | Helcionella Parkhaev and Demidenko p. 1021 |
| 2016 | Helcionella Jacquet and Brock |
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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.
G. †Helcionella Grabau and Shimer 1909
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†Helcionella antiqua Abaimova 1976
†Helcionella aspera Noetling 1894
†Helcionella capula Geyer 1986
†Helcionella explanata Feng et al. 2000
†Helcionella histosia Jacquet and Brock 2016
†Helcionella kunyangensis He and Yang 1982
†Helcionella lemdadensis Geyer et al. 2018
†Helcionella pricei Resser and Howell 1938
†Helcionella radiata Yü 1979
†Helcionella sidingshanensis Zhou and Xiao 1984
†Helcionella tianzhushanensis Yü 1979
†Helcionella waageni Redlich 1899
†Helcionella xinjiangensis Yü 1986
†Helcionella yunnanensis Zhang and Babcock 2002
Invalid names: Pseudotheca Redlich 1899 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| 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." |