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Ptychocylindrites
Taxonomy
Ptychocylindrites was named by Cossmann (1895) [Sepkoski's age data: J Kimm J Tith-u]. It is not extant. Its type is Bulla condati.
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 | Ptychocylindrites Cossmann |
| 2002 | Ptychocylindrites Sepkoski |
| 2012 | Ptychocylindrites 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. †Ptychocylindrites Cossmann 1895
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†Ptychocylindrites condati Guirand and Ogérien 1865
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Gründel and A. Nützel 2012 | The shell is cylindrical to spindle shaped. In lateral view, the last whorl covers all previous whorls. The spire morphology is not well documented; it is seemingly flat to concave and the spire whorls are visible only in apical view. The adapical edge of the whorls is angulated and denticulate. The columella has two folds. The protoconch is unknown. |