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Helcionelloidea
Taxonomy
Helcionellacea was named by Wenz (1938) [elevated by Knight et al. (1960)].
It was corrected as Helcionelloidea by Golikov and Starobogatov (1975), Parkhaev (2001), Parkhaev (2002), Parkhaev (2004), Parkhaev and Demidenko (2010), Wagner (2023).
It was assigned to Bellerophontina by Knight et al. (1960); to Cyrtonellida by Runnegar and Jell (1976), Runnegar (1990); to Monoplacophora by Wahlman (1992); to Helcionelliformes by Parkhaev (2001), Parkhaev (2002), Parkhaev (2004), Parkhaev and Demidenko (2010); and to Helcionellida by Golikov and Starobogatov (1975), Atkins and Peel (2004), Wagner (2023).
It was corrected as Helcionelloidea by Golikov and Starobogatov (1975), Parkhaev (2001), Parkhaev (2002), Parkhaev (2004), Parkhaev and Demidenko (2010), Wagner (2023).
It was assigned to Bellerophontina by Knight et al. (1960); to Cyrtonellida by Runnegar and Jell (1976), Runnegar (1990); to Monoplacophora by Wahlman (1992); to Helcionelliformes by Parkhaev (2001), Parkhaev (2002), Parkhaev (2004), Parkhaev and Demidenko (2010); and to Helcionellida by Golikov and Starobogatov (1975), Atkins and Peel (2004), Wagner (2023).
Subtaxa
Synonymy list
| Year | Name and author |
|---|---|
| 1938 | Helcionellacea Wenz |
| 1960 | Helcionellacea Knight et al. p. 172 |
| 1975 | Helcionelloidea Golikov and Starobogatov p. 207 |
| 1976 | Helcionellacea Runnegar and Jell p. 116 |
| 1990 | Helcionellacea Runnegar p. 234 |
| 1992 | Helcionellacea Wahlman |
| 2001 | Helcionelloidea Parkhaev p. 136 |
| 2002 | Helcionelloidea Parkhaev p. 34 |
| 2004 | Helcionellacea Atkins and Peel p. 3 |
| 2004 | Helcionelloidea Parkhaev p. 594 |
| 2010 | Helcionelloidea Parkhaev and Demidenko p. 1007 |
| 2023 | Helcionelloidea Wagner |
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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.
Superfm. †Helcionelloidea Wenz 1938
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Fm. †Carinopeltidae Parkhaev 2013
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G. †Carinopelta Parkhaev 2013
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†Carinopelta carinata Parkhaev 2001
Invalid names: Igarkiella Vasil’yeva 1998 [replaced]
G. †Protoconus Yü 1979
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†Protoconus crestatus Yü 1979
Invalid names: Patellella Vassiljeva 1990 [synonym]
G. †Squamiconus Vassiljeva 1990
Fm. †Igarkiellidae Parkhaev 2002
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Invalid names: Procarinariidae Wenz 1938 [empty]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. Yu. Parkhaev 2001 | Helcionelliformes without siphonal groove of the posterior margin of the aperture. | |
| P. Y. Parkhaev and Y. Demidenko 2010 | "Siphonal groove absent from posterior apertural margin." |