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Costatomphalus michaillensis
Taxonomy
Straparolus michaillensis was named by Pictet and Campiche (1863).
It was recombined as Costatomphalus michaillensis by Gründel and Kollmann (2012).
It was recombined as Costatomphalus michaillensis by Gründel and Kollmann (2012).
Synonymy list
| Year | Name and author |
|---|---|
| 1863 | Straparolus michaillensis Pictet and Campiche p. 556 figs. Pl. 88, Fig. 13 |
| 2012 | Costatomphalus michaillensis Gründel and Kollmann p. 101 figs. Pl. 3, Figs 10–12 |
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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.
†Costatomphalus michaillensis Pictet and Campiche 1863
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Gründel and H. A. Kollmann 2012 | The figured specimen has a maximum diameter of 4.5 mm and a total height of 2.7 mm. The first whorls are planispirally coiled, convex and probably smooth. The steepness of the coiling increases gradually in the final whorls of larger specimens. A carina developing shortly afterwards is reinforced by a prominent spiral rib. On later whorls, the lower whorl face bears two additional spiral ribs and another one at the margin towards the base. Two indistinct spiral ribs each are developed below the adapical suture and on the base. Axial ribs appear gradually, first on the lower whorl face and on the base, later also on the upper whorl face. They extend from the adapical suture to the large umbilicus. They are weak in the beginning but increase rapidly in strength and are finally bulging and prominent. There are 12 axial ribs on the final whorl of the figured specimen; these ribs are noded at the intersections with spiral ribs. The aperture is rounded. |
Measurements
No measurements are available
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| Source: superf = superfamily, c = class | |||||
| References: Hendy et al. 2009, Kiessling 2004 | |||||
Age range: Late/Upper Barremian or 130.00000 to 125.45000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Barremian | France (Drôme) | Costatomphalus michaillensis (75576 177726) |