Bashkiria, Nalivkin, 1979
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publication ID |
https://doi.org/ 10.4202/app.2010.0106 |
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persistent identifier |
https://treatment.plazi.org/id/03BB9544-FF8B-A659-FC26-F8B998B3FBBF |
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treatment provided by |
Felipe |
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scientific name |
Bashkiria |
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Bashkiria ? sp.
Fig. 28 View Fig .
Material.—Four incomplete ventral and 3 incomplete dorsal valves from samples GB and GT.
Remarks.—The characteristic features of this species include strongly transverse shell with pointed cardinal extremities, weak ventral sulcus bounded by thick plicae, distinct in umbonal region but barely perceptive anteriorly, weak dorsal fold, better defined posteriorly by deep and wide furrows, smooth, non−costate flanks, except for one pair of weakening anteriorly, rounded plicae on dorsal valve, wide, low triangular ventral interarea with denticulate hinge line, small dental adminicula, confined to the umbonal region only, rather small ventral muscle scars, absent crural plates, triangular ctenophoridium supported by plate−like ridges which join the dorsal edge of the inner socket ridges and crural bases ( Fig. 28D View Fig 3). The most characteristic features of the species which allow to distinguish it easily from other forms of the Muhua fauna are the smooth, not ribbed, expanded laterally shell and the evident concentric imbricating lamellae. These features, together with internal structure of the shell suggest that the species represents a paeckelmanelloid spiriferid. It shows some similarity with the Tournaisian genus Bashkiria expressed especially in the strongly transverse shell outline and the development of fold and sulcus. Moreover, Bashkiria has a very weak, sometimes even difficult to observe shell costation, which may resemble the smooth flanks of the species from Muhua. Unfortunately, inadequate present material does not allow a more detailed description and comparison.
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