| Species | Psiloceras trochoeides LANGE |
| Author | LANGE |
| Group | Psiloceraten |
| Horizon | naumanni-horizon |
| Zone | calliphyllum-zone |
| Stage | Lower Hettangian |
Description
This large-growing species is simple and radially ribbed; the ribs show no external protrusion. The nodule stage typical of Psiloceras is present.
The cross-section of the coils is rounded rectangular, the coils are very thick. Ps. trochoeides occurs at the transition planorbis/megastoma zone, i.e. at the base of the mid-hettangium.
* Description according to Lange (1952), supplemented
Compare
Characteristic for this type is the winding cross-section and the simple ribbing.
Psiloceras costosum has an oval coil cross-section, Psiloceras naumanni a much smaller coil width.
Dimension
Dimensions with D= 80mm (according to Lange):
Nw % v. D: ca. 60%
Wh % v. D: ca. 20%
Wb % v. D: ca. 18%
Literature
- 1952 Psiloceras (Paraphylloceras) trochoeides sp. n. – Lange S. 119, Taf, 14.9
