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Retispira asiatica
Taxonomy
Bellerophon asiaticus was named by Wirth (1936). It is not a trace fossil.
It was recombined as Retispira asiatica by Yochelson and Yin (1985), Kaim and Nützel (2011) and Foster et al. (2019).
It was recombined as Retispira asiatica by Yochelson and Yin (1985), Kaim and Nützel (2011) and Foster et al. (2019).
Synonymy list
| Year | Name and author |
|---|---|
| 1936 | Bellerophon asiaticus Wirth p. 441 figs. 14 (7a-b) |
| 1971 | Bellerophon asiaticus Nakazawa p. 128 figs. Pl 25, figs 9-11 |
| 1977 | Bellerophon asiaticus Termier and Termier p. 63 fig. 12 |
| 1985 | Retispira asiatica Yochelson and Yin pp. 1308 – 1312 figs. 4.14.3, 4.5, 4.6, 5 |
| 2011 | Retispira asiatica Kaim and Nützel p. 193 |
| 2019 | Retispira asiatica Foster et al. p. 638 figs. 13C-E |
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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.
†Retispira asiatica Wirth 1936
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. L. Yochelson and H. Yin 1985 | Small, strongly lirate bellerophontaceans having narrow umbilici. Umbilici relatively small, the whorl profile uniformly curved from the opening across the shell to the periphery; curvature after crossing periphery decreasing so that the profile approximates that of a Roman helmet, being only slightly curved beyond the umbilici and having a prominent dorsal crest bearing the selenizone. Selenizone raised and very slightly concave between individual lira; slit depth unknown; lunulae unknown. Growth lines, rising from the umbilici about at right angles to the axis of coiling along the flanks and continuing straight for about half the total width of the whorl, then gradually arching back to form an angle of about 30" with the edge of the selenizone. Ornament of mature stage consisting of more than 20 moderately coarse spiral lirae, each lira semicircular in cross section; interspaces about four times as wide as the lirae; ornament of early growth stages unknown. Growth lines exceedingly faint, best seen as impressions. Outer shell layer exceedingly thin. Inductural deposits unknown. |
Measurements
No measurements are available
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| Source: f = family, o = order, c = class | |||||
| References: Hendy 2009, Kiessling 2004 | |||||
Age range: Griesbachian or 251.90200 to 250.50000 Ma
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Griesbachian | China (Guizhou) | Retispira asiatica (121324 121325 200985 200989) |