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Obtusoconus
Taxonomy
Obtusoconus was named by Yü (1979) [Sepkoski's age data: Cm Tomm-l Cm uMid-u Sepkoski's reference number: 89,529,1030]. It is not extant. Its type is Obtusoconus paucicostatus.
It was assigned to Scenellidae by MacKinnon (1985); to Mollusca by Sepkoski (2002); to Yangtzeconinae by Parkhaev and Demidenko (2010); and to Helcionellidae by Parkhaev (2002), Gubanov et al. (2004) and Kouchinsky et al. (2017).
It was assigned to Scenellidae by MacKinnon (1985); to Mollusca by Sepkoski (2002); to Yangtzeconinae by Parkhaev and Demidenko (2010); and to Helcionellidae by Parkhaev (2002), Gubanov et al. (2004) and Kouchinsky et al. (2017).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1979 | Obtusoconus Yü |
| 1984 | Hematoconus Chen and Xiong p. 159 |
| 1985 | Obtusoconus MacKinnon p. 68 |
| 2002 | Obtusoconus Parkhaev p. 34 |
| 2002 | Obtusoconus Sepkoski |
| 2004 | Obtusoconus Gubanov et al. p. 205 |
| 2010 | Obtusoconus Parkhaev and Demidenko p. 1039 |
| 2017 | Obtusoconus Kouchinsky et al. p. 338 |
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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. †Obtusoconus Yü 1979
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†Obtusoconus ampla Voronin et al. 1982
†Obtusoconus brevis Esakova and Zhegallo 1996
†Obtusoconus foliaceus MacKinnon 1985
†Obtusoconus grossicostus Feng et al. 1994
†Obtusoconus honorabilis Qian et al. 1979
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Invalid names: Lapworthella xianfengensis Wang 1994 [synonym], Obtusoconus aberratus Esakova and Zhegallo 1996 [synonym], Obtusoconus multicostatus Yü 1979 [synonym]
†Obtusoconus mirabilis Vasil'eva 1990
†Obtusoconus paucicostatus Yü 1979
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Invalid names: Obtusoconus pygmaeus Chen and Xiong 1983 [synonym]
†Obtusoconus reduncus Gubanov et al. 2004
†Obtusoconus vostokovae Vassiljeva 1990
Invalid names: Hematoconus Chen and Xiong 1984 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. Y. Parkhaev and Y. Demidenko 2010 | "Shell cap-shaped, high conical, rarely of medium height, moderately compressed laterally. Apex position central or subcentral. Anterior field slightly convex or straight in apical part, becomes noticeably concave towards aperture. Posterior field almost straight or convex, can be slightly concave in apical part. Aperture oval. Apertural margin simple, without flaring and sinuses. Ornamentation represented by prominent concentric ribs. Protoconch separated from teleoconch by oblique furrow, axis of protoconch forms angle with axis of teleoconch." |