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Truncatoconus
Taxonomy
Truncatoconus was named by Yü (1979) [Sepkoski's age data: Cm Tomm-u Sepkoski's reference number: 1006]. It is not extant. Its type is Truncatoconus yichangensis.
It was assigned to Mollusca by Yü (1979), Sepkoski (2002); and to Helcionellinae by Parkhaev and Demidenko (2010).
It was assigned to Mollusca by Yü (1979), Sepkoski (2002); and to Helcionellinae by Parkhaev and Demidenko (2010).
Species
T. campylurus, T. yichangensis (type species)
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1979 | Truncatoconus Yü |
| 2002 | Maishucunconus Sepkoski |
| 2002 | Trunctoconus Sepkoski |
| 2010 | Truncatoconus Parkhaev and Demidenko p. 1008 |
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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. †Truncatoconus Yü 1979
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†Truncatoconus campylurus Jiang 1980
†Truncatoconus yichangensis Yü 1979
Invalid names: Maishucunconus [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. Y. Parkhaev and Y. Demidenko 2010 | "Cap-shaped low conical shell with subcentral blunt apex and oval or elliptic aperture. Posterior apertural margin cut by wide and shallow sinus. Ornamentation absent or represented by indistinct concentric folds." |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Hendy 2009, Hendy et al. 2009 | |||||
Age range: base of the Meishucunian to the top of the Tommotian or 530.70000 to 521.00000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Nemakit-Daldynian | China (Yunnan) | T. yichangensis (171896) | |
| Meishucunian - Tommotian | China (Yunnan) | T. yichangensis, T. campylurus (96449) | |
| Tommotian | China (Hubei) | T. yichangensis (56808) |