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Mesotaxis asymmetrica
Taxonomy
Polygnathus dubia asymmetrica was named by Bischoff and Ziegler (1957). It is a 3D body fossil.
It was recombined as Polygnathus asymmetrica by Ziegler and Klapper (1964); it was recombined as Polygnathus asymmetricus by Druce (1976); it was recombined as Mesotaxis asymmetricus by Ovnatanova and Kononova (2008); it was recombined as Mesotaxis asymmetrica by Ovnatanova et al. (2017).
It was recombined as Polygnathus asymmetrica by Ziegler and Klapper (1964); it was recombined as Polygnathus asymmetricus by Druce (1976); it was recombined as Mesotaxis asymmetricus by Ovnatanova and Kononova (2008); it was recombined as Mesotaxis asymmetrica by Ovnatanova et al. (2017).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1957 | Polygnathus dubia asymmetrica Bischoff and Ziegler pp. 88–89 figs. pl. 16, figs. 18, 20–22; pl. 21, fig. 3. |
| 1964 | Polygnathus asymmetrica Ziegler and Klapper p. 422 |
| 1976 | Polygnathus asymmetricus Druce p. 180 figs. pl. 69, figs. 1–3 |
| 2008 | Mesotaxis asymmetricus Ovnatanova and Kononova p. 1083 figs. pl. 25, fig. 8 |
| 2017 | Mesotaxis asymmetrica Ovnatanova et al. p. 1060 figs. plate 10, fig. 4; Plate 13, fig. 1; Plate 22, figs. 3 and 5; Plate 28, figs. 2–4, 6–9 |
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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.
†Mesotaxis asymmetrica Bischoff and Ziegler 1957
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| N. S. Ovnatanova et al. 2017 | Pa element with widely oval and slightly asymmetrical platform. Anterior platform end rounded; posterior end pointed and turned down- wards. Median ridge slightly arched and reaching pos- terior end of platform. Free blade from one-sixth to one-third as long as platform. Troughs short and poorly pronounced. Platform surface uniformly covered with fine nodes. Basal cavity small, lens-shaped, symmetrical, and located in anterior third or near platform middle. Keel low and thin. |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum | |||||
| References: Carroll 1988, Aberhan 1992 | |||||
Age range: base of the Givetian to the top of the Early/Lower Frasnian or 387.95000 to 379.00000 Ma
Collections (31 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Givetian | Algeria | Polygnathus asymmetricus (40454) | |
| Givetian - Frasnian | Canada (Ontario) | Mesotaxis asymmetrica (40046) | |
| Early/Lower Frasnian | China (Guangxi) | Mesotaxis asymmetricus (13138 13139 13140) | |
| Frasnian | Morocco | Mesotaxis asymmetricus (145526 149252) Polygnathus asymmetricus (148865 148866 148867 149347 152963 152964 152965 152976 153031 153032 153033 153034 153035 153036 153037) | |
| Frasnian | Russian Federation (Arkhangel'skaya Oblast') | Polygnathus asymmetricus (40713 40714) | |
| Frasnian | Spain | Mesotaxis asymmetrica (197176) Mesotaxis asymmetricus (145884 197173) | |
| Frasnian | Australia (Western Australia) | Polygnathus asymmetrica (233600) | |
| Frasnian | Spain (Aragon) | Polygnathus asymmetricus (40448) | |
| Late/Upper Devonian | China (Guangxi) | Polygnathus asymmetricus (3964 4011) |