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Volvocylindrites
Taxonomy
Volvocylindrites was named by Cossmann (1895) [Sepkoski's age data: J Oxfo-l K Nc]. It is not extant. Its type is Volvula marcousana.
It was assigned to Cephalaspida by Sepkoski (2002); and to Cylindrobullinidae by Gründel and Nützel (2012).
It was assigned to Cephalaspida by Sepkoski (2002); and to Cylindrobullinidae by Gründel and Nützel (2012).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1895 | Volvocylindrites Cossmann |
| 2002 | Volvocylindrites Sepkoski |
| 2012 | Volvocylindrites Gründel and Nützel pp. 37 - 38 |
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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. †Volvocylindrites Cossmann 1895
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†Volvocylindrites marcousana Guirand and Ogérien 1865
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Gründel and A. Nützel 2012 | The shell is cylindrical to spindle-shaped and tapers on both ends (anterior and posterior) (bulliform). The last whorl covers all previous whorls entirely (convolute). The aperture is elongated and narrow and extends on the posterior end of the shell. The columella has a single weak fold. |