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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 |
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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 | |
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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. |