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Bipulvina liaoningensis
Taxonomy
Pilina liaoningensis was named by Yü and Yochelson (1999). Its type specimen is NIGP 113849), a shell, and it is a 3D body fossil. Its type locality is DoufangKou section exposed near Yingzi village Huolinanzhai, which is in a Tremadocian carbonate dolomite in the Fengshan Formation of China.
It was recombined as Bipulvina liaoningensis by Wagner (2023).
It was recombined as Bipulvina liaoningensis by Wagner (2023).
Synonymy list
| Year | Name and author |
|---|---|
| 1999 | Pilina liaoningensis Yü and Yochelson pp. 380 - 382 figs. 2, 3a-i, 4a-e |
| 2023 | Bipulvina liaoningensis Wagner p. S6969 |
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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.
†Bipulvina liaoningensis Yü and Yochelson 1999
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| W. Yü and E. L. Yochelson 1999 | Shell large, tryblidiforrn, elliptical in dorsal view.
Protoconch symmetrically conical. Apex overhanging adapical margin. Surface ornamented with stout comarginal rugae, fine growth lines and radiating threads. Interior with eight metarnetric pairs of muscle scars, one pair of radular muscle scars, and other internal structures on dorsal side of steinkern. Shell large, elliptical in dorsal view. Protoconch small, about 5 mm wide, symmetrically conical in dorsal view, protruding strongly forward, broadly rounded in the basal part, slowly and gradually increasing in size away from the apex. Tip and external features of protoconch are not preserved (Figure 3c). Dorsum gently flattened, oblique toward the abapical margin, with greatest shell width just behind midlength. Abapical margin rounded; adapical margin narrowly rounded, though not known in detail. Lateral margins more broadly curved but also not known in detail. Shell surface ornamented with comarginal rugae, growth lines and radiating threads. Comarginal rugae stout and evenly distributed, more than 20 in number, gradually becoming stronger from apex toward abapical margin, with the distance between rugae also gradually becoming wider. Growth lines rather fine, closely spaced. Radiating threads crossing rugae and growth lines to form a cancellate sculpture. |