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Nikolaispira
Taxonomy
Nikolaispira was named by Nikitin et al. (1996). Its type is Nikolaispira rasilis.
It was assigned to Articulata by Popov et al. (1999); and to Meristellidae by Nikitin et al. (1996), Popov et al. (2002).
It was assigned to Articulata by Popov et al. (1999); and to Meristellidae by Nikitin et al. (1996), Popov et al. (2002).
Species
N. rasilis (type species)
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1996 | Nikolaispira Nikitin et al. p. 95 |
| 1999 | Nikolaespira Popov et al. |
| 2002 | Nikolaispira Popov et al. |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| I.F. Nikitin et al. 1996 | Shell ventribiconvex, smooth, with parasulcate anterior margin; ventral sulcus and dorsal fold developed anterior to mid-length; ventral interior with small teeth supported by short and thin, laterally placed dental plates; dorsal interior with septalium supported by low median septum; brachidium with up to four laterally directed whorls, jugal processes discrete and directed posteroventrally. |