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Promyalina schamarae
Taxonomy
Myalina schamarae was named by Bittner (1899).
It was recombined as Promyalina schamarae by Xu (1978), Kurushin (1985), Dagis et al. (1996), Kumagae and Nakazawa (2009), Foster et al. (2017).
It was recombined as Promyalina schamarae by Xu (1978), Kurushin (1985), Dagis et al. (1996), Kumagae and Nakazawa (2009), Foster et al. (2017).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1899 | Myalina schamarae Bittner p. 19 figs. pl. 4, figs 20–25. |
| 1976 | Myalina schamarae Bychkov et al. |
| 1978 | Promyalina schamarae Xu p. 319 figs. Pl 104, fig 23 |
| 1985 | Promyalina schamarae Kurushin p. 62 figs. Pl 11, figs 2-7 |
| 1996 | Promyalina schamarae Dagis et al. p. 29 figs. Pl 4, figs 16-19 |
| 2009 | Promyalina schamarae Kumagae and Nakazawa p. 157 figs. 144.2-144.3 |
| 2017 | Promyalina schamarae Foster et al. p. 854 fig. 2C–G |
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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.
†Promyalina schamarae Bittner 1899
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| W. J. Foster et al. 2017 | Shell is small, mytiliform, inequilateral, prosocline, higher than long, and moderately inflated. Umbo is small, terminal and prosogyrate. Posterior dorsal margin is straight. Posterior margin is slightly convex, forming a rounded posteroventral margin. Anterior margin is long, nearly straight or weakly acute and partly depressed near the umbo. |
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 3 | 25.9 | 17.4 | 32.8 | 30.3 | 8.26 | |
| valve height | 13 | 20.2 | 14.2 | 27.9 | 22.8 | 4.84 |
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| Source: subc = subclass, c = class | |||||
| References: Aberhan et al. 2004, Eaton 1871 | |||||
Age range: base of the Griesbachian to the top of the Dienerian or 251.90200 to 249.90000 Ma
Collections (92 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Changhsingian - Griesbachian | China (Guizhou) | Promyalina schamarae (205986 205987 205988 205989 205992 205993) | |
| Changhsingian - Griesbachian | China (Yunnan) | Promyalina schamarae (205965 205967 205968) | |
| Griesbachian | China (Guizhou) | Promyalina schamarae (151147 151149 205960 205991 205994 205995 205997 205998 205999) | |
| Griesbachian | Svalbard and Jan Mayen | Myalina schamarae (212783) Promyalina schamarae (182611 182612) | |
| Griesbachian | Russian Federation | Myalina schamarae (214748) Promyalina schamarae (90207) | |
| Griesbachian | Greenland | Myalina schamarae (48058 48059 112718 112722 112756 118489 118491 118492 118501 118505 118506 118510 118512 118513 118514 118517 118522 118523 118526 118527 118539 118564 118566 118570 118573 118576 118577 118591 118592 118596 118600 118607 118608 118609 118611 118620 118627 118628 118650 118664 118677 118684 118697 118699 118703 118711 118729 118730 118756 118784) | |
| Induan | Svalbard and Jan Mayen (Barentsøya) | Myalina schamarae (212889) | |
| Induan | China (Chongqing) | Promyalina schamarae (123717) | |
| Induan | Russian Federation | Promyalina schamarae (136037 136040 136045 136049 136052 136053) | |
| Early/Lower Triassic | Russian Federation (Primorsky Krai) | Myalina schamarae (202937 202940) | |
| Dienerian | Russian Federation | Myalina schamarae (214721 214749) Promyalina schamarae (90209 102212 107027 107101) | |
| Dienerian | Greenland | Myalina schamarae (118493 118670 118735) |