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Sulcatospira praecursor
Taxonomy
Qilianotryma praecursor was named by Nikitin and Popov (1984). Its type specimen is CNIGR 204/12095 and is a 3D body fossil.
It was recombined as Sulcatospira praecursor by Popov et al. (1999).
It was recombined as Sulcatospira praecursor by Popov et al. (1999).
Synonymy list
| Year | Name and author |
|---|---|
| 1984 | Qilianotryma praecursor Nikitin and Popov p. 159 figs. pl. 20, figs 15–16, text-fig. 49. |
| 1999 | Sulcatospira praecursor Popov et al. pp. 644 - 645 figs. Plate 1, figures 7–10 |
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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.
†Sulcatospira praecursor Nikitin and Popov 1984
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L.E. Popov et al. 1999 | ulcatospira? with slightly ventribiconvex, rounded pentagonal shell, about 107 per cent. as long as wide and 55 per cent. as thick as long; anterior commissure parasulcate; ventral beak slightly acuminate, posteriorly directed; delthyrium open; ventral sulcus sharpened laterally by accentuated, angular costae originating at the umbo; dorsal valve with shallow sulcus divided medially by low plication, reversed at mid-valve into a low median fold bordered laterally by low angular plications; radial ornament costate with two or three ribs in sulcus, three or four on fold and seven to 13 on flanks; one or two secondary costellae bifurcating in the median part of the fold and sulcus near the anterior margin; accentuated median costa usually developed in the ventral valve. |
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 | |||||