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Helcionelliformes (disused)
Taxonomy
Helcionelliformes was named by Golikov and Starobogatov (1975). It is not extant.
It was assigned to Archaeogastropoda by Parkhaev (2004); to Archaeobranchia by Parkhaev (2001), Parkhaev and Demidenko (2010); and to Helcionelloida by Wagner (2023).
It was assigned to Archaeogastropoda by Parkhaev (2004); to Archaeobranchia by Parkhaev (2001), Parkhaev and Demidenko (2010); and to Helcionelloida by Wagner (2023).
Synonymy list
| Year | Name and author |
|---|---|
| 1975 | Helcionelliformes Golikov and Starobogatov |
| 2001 | Helcionelliformes Parkhaev p. 136 |
| 2004 | Helcionelliformes Parkhaev p. 594 |
| 2010 | Helcionelliformes Parkhaev and Demidenko p. 1007 |
| 2023 | Helcionelliformes 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.
Or. †Helcionelliformes Golikov and Starobogatov 1975
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. Yu. Parkhaev 2001 | Archaeobranchia with symmetrical cap-shaped, planispiral or close to planispiral shell with a few coils. Forms with a planispiral shell have elongated aperture, the length of which os larger, equal, or slightly smaller than the shell diameter. Palial caecum was probably absent. |
Measurements
No measurements are available
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| Source: c = class | |||||
| Reference: Hendy et al. 2009 | |||||
Collections
No collection or age range data are available