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Emarginoconus
Taxonomy
Emarginoconus was named by Yü (1979) [Sepkoski's age data: Cm Tomm-l Cm Atda-u Sepkoski's reference number: 1006,1030]. It is not extant. Its type is Emarginoconus mirus.
It was assigned to Mollusca by Sepkoski (2002); to Helcionellidae by Parkhaev (2002); and to Helcionellinae by Parkhaev and Demidenko (2010).
It was assigned to Mollusca by Sepkoski (2002); to Helcionellidae by Parkhaev (2002); and to Helcionellinae by Parkhaev and Demidenko (2010).
Species
E. mirus (syn. Diandongoconus varians, E. nana) (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 1979 | Emarginoconus Yü |
| 2002 | Emarginoconus Parkhaev p. 34 |
| 2002 | Emarginoconus Sepkoski |
| 2010 | Emarginoconus Parkhaev and Demidenko p. 1019 |
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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. †Emarginoconus Yü 1979
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†Emarginoconus mirus Yü 1979
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Invalid names: Diandongoconus varians He and Yang 1982 [synonym], Emarginoconus nana Chen and Zhang 1980 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. Y. Parkhaev and Y. Demidenko 2010 | "Cap-shaped, low conical shell, very rapidly expanding from apex towards aperture. Apex hooked and displaced posteriorly, almost reaching posterior apertural margin. Aperture circular, with shallow sinus below apex. Shell ornamentation represented by distinct concentric growth lines." |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Hendy et al. 2009, Hendy 2009 | |||||
Age range: base of the Meishucunian to the top of the Tommotian or 530.70000 to 521.00000 Ma
Collections (16 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Nemakit-Daldynian | Russian Federation (Siberia) | E. mirus (50419) | |
| Meishucunian - Nemakit-Daldynian | China (Yunnan) | E. mirus (49681) | |
| Meishucunian | China (Yunnan) | E. mirus (201523 201552 201555 201557 201585 201586 201587 201590 201591) | |
| Meishucunian - Tommotian | China (Yunnan) | E. mirus (50504) | |
| Tommotian | Russian Federation (Khabarovsk Krai) | E. mirus (50420) | |
| Tommotian | China (Hubei) | E. mirus (56807) | |
| Tommotian | China (Yunnan) | E. mirus (171901 171902) |