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Striactaeonina
Taxonomy
Striactaeonina is a genus. It is not extant.
It was assigned to Cephalaspida by Sepkoski (2002); and to Tubiferidae by Gründel and Nützel (2012) and Schulbert and Nützel (2013).
It was assigned to Cephalaspida by Sepkoski (2002); and to Tubiferidae by Gründel and Nützel (2012) and Schulbert and Nützel (2013).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2002 | Striactaeonina Sepkoski |
| 2012 | Striactaeonina Gründel and Nützel p. 41 |
| 2013 | Striactaeonina Schulbert and Nützel p. 766 |
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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.
G. †Striactaeonina
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†Striactaeonina richterorum Schulbert et al. 2013
†Striactaeonina waltschewi Schulbert et al. 2013
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Gründel and A. Nützel 2012 | The shell has a cylindrical to oval shape with distinctly elevated spire. The last whorl is moderately convex and not inflated. The whorls have a subsutural ramp which is oblique in most cases. The ramp is demarcated from whorl face by a spiral furrow. Spiral striae (fine furrows) are present at least on base but also on whorl flanks in many cases. The growth lines are prosocyrt and curving backward in their adapical portion. The aperture is drop-shaped, acute posteriorly and rounded anteriorly. The whorls embrace well below the ramp. The outer lip is convex. The inner lip shows a convex parietal and concave columellar portion. The protoconch is medio- to transaxial. |