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Megastrophia (Megastrophia) uralensis
Taxonomy
Leptaena ouralensis was named by de Verneuil (1845) [Lectotype selected by Wright (2013).]. Its type specimen is EM 25053A, a valve (dorsal valve), and it is a 3D body fossil.
It was recombined as Strophomena uralensis by Chernyshev (1887); it was recombined as Stropheodonta uralense by Nalivkin (1930); it was recombined as Stropheodonta uralensis by Rzhonsnitskaya (1955); it was recombined as Megastrophia uralensis by Tyazheva (1962) and Kim (2011); it was corrected as Leptaena uralensis by Nalivkin (1977); it was recombined as Megastrophia (Megastrophia) uralensis by Wright (2013).
It was recombined as Strophomena uralensis by Chernyshev (1887); it was recombined as Stropheodonta uralense by Nalivkin (1930); it was recombined as Stropheodonta uralensis by Rzhonsnitskaya (1955); it was recombined as Megastrophia uralensis by Tyazheva (1962) and Kim (2011); it was corrected as Leptaena uralensis by Nalivkin (1977); it was recombined as Megastrophia (Megastrophia) uralensis by Wright (2013).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1845 | Leptaena ouralensis de Verneuil pp. 220-222 figs. pl. 14, figs 1a-d |
| 1887 | Strophomena uralensis Chernyshev p. 108 |
| 1930 | Stropheodonta uralense Nalivkin p. 69 figs. pl. 1, figs 1a-c, 12a-c, 15a-b |
| 1955 | Stropheodonta uralensis Rzhonsnitskaya p. 244 figs. pl. 54, fig. 3a-b. |
| 1962 | Megastrophia uralensis Tyazheva p. 41 figs. pl. 9, fig. 6-7 |
| 1977 | Leptaena uralensis Nalivkin p. 266 |
| 2011 | Megastrophia uralensis Kim figs. txt. fig. 3, pl. 3, figs 28-29. |
| 2013 | Megastrophia (Megastrophia) uralensis Wright pp. 87 - 91 figs. 1-2 |
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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.
†Megastrophia (Megastrophia) uralensis de Verneuil 1845
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. J. Wright 2013 | Strongly concavo-convex, thin, rather alate shells up to about 75 mm wide and 40 mm long. Sculpture on both valves parvicostellate with 4-6 fine costellae between the major ribs, which tend to be discontinuous on one specimen (i.e. the nervate condition shown by EM 25053B, see Fig. 1D). Apsacline ventral interarea several mm high, weakly curved, and strongly denticulate and striated; pseudodeltidium apparently simple. No information on ventral valve interior. Dorsal valve with a slender median ridge which extends to about 70% of valve length and a small subcircular adductor field with low rounded bounding ridges located well posterior of midlength. An irregular oblique row of nodes, flanking the median ridge, arises posterior of midlength and extends to at least 70% of dorsal valve length. Cardinal process lobes not seen, but apparently small (cf. Gratsianova 1978, pl. 56, fig. 16). Marginally, dorsal valve has low, linear, rounded ribs internally, as illustrated by Alekseeva et al. (1996, pl. 1, fig. 5). Pseudopunctae abundant. |
Measurements
No measurements are available
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| Source: o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Nesnidal et al. 2013, Aberhan et al. 2004 | |||||
Age range: Late/Upper Emsian or 399.50000 to 393.47000 Ma
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Emsian | Uzbekistan | Megastrophia uralensis (169214) | |
| Emsian | Afghanistan (Ghazni) | Megastrophia uralensis (75095) | |
| Late/Upper Emsian | Russian Federation | Megastrophia uralensis (35715 35718 35719) | |
| Late/Upper Emsian - Eifelian | Russian Federation (Arkhangel'skaya Oblast') | Megastrophia uralensis (40708) |