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Ashinaorthis recta
Taxonomy
Mimella recta was named by Klenina (1984) [= 1984 Mimella brevis Rukavishnikova; Klenina: 45, pl. 1, fig. 9, pl. 3, figs 5, 8–13, pl. 4, figs 4, 5, 9–18.]. Its type specimen is IGNA 411/46, a shell (conjoined valves), and it is a 3D body fossil. It is the type species of Ashinaorthis.
It was recombined as Ashinaorthis recta by Popov and Cocks (2014).
It was recombined as Ashinaorthis recta by Popov and Cocks (2014).
Synonymy list
| Year | Name and author |
|---|---|
| 1984 | Mimella recta Klenina p. 47 figs. pl. 3, figs 14–16 |
| 2014 | Ashinaorthis recta Popov and Cocks pp. 735 - 737 fig. 22A–H |
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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.
†Ashinaorthis recta Klenina 1984
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. E. Popov and L. R. M. Cocks 2014 | Shell slightly dorsibiconvex to subequally biconvex, transverse suboval, about 75% as long as wide, with maximum width at mid-length, and slightly more than half as thick as long. Hinge line about two-thirds valve width; cardinal extremities rounded. Anterior commissure variably uniplicate. Ventral valve evenly convex, with a broad shallow sulcus originating slightly posterior to the mid-valve and gradually deepening anteriorly. Ventral interarea moderately high, triangular, curved in the umbonal area. Delthyrium narrow, triangular with narrow deltidial plates on the lateral margins. Dorsal valve evenly convex with a planar, anacline interarea and a weak sinus originating at the umbo and fading completely towards mid-valve. Poorly defined dorsal median fold may be present in the anterior half of the shell. Radial ornament finely fascicostellate, with up to 16 rounded primary ribs in the ventral umbo and up to 14 costellae per 3 mm along the anterior margin of mature specimens. Ventral interior with strong teeth and thin divergent dental plates. Ventral muscle field subtriangular, bilobed, surrounded by strong muscle bounding ridges, slightly longer than wide and about 40% valve length. Ventral mantle canals saccate with divergent vascula media . Dorsal interior with ridge-like, anteriorly divergent brachiophores, with brachiophore bases convergent towards the bottom of the low, narrow subtriangular notothyrial platform. Cardinal process high, blade-like, with a thickened shaft and crenulated myophore. Dorsal median ridge short and low. Adductor muscle scars gently impressed, with a large posterior pair of scars. |
Measurements
No measurements are available
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| Source: f = family, o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Aberhan et al. 2004, Nesnidal et al. 2013, Hendy 2009 | |||||