| Species | Waehneroceras curvicorne LANGE |
| Author | LANGE |
| Group | Psiloceraten |
| Horizon | naumanni-horizon |
| Zone | calliphyllum-zone |
| Stage | Lower Hettangian |
Description
After the strong nodule stage, numerous, fine but sharp ribs suddenly set in for two turns. They are s-shaped and slightly retroradiate. There are approx. 40 per turn. After that, the ribs become wider and even more distinctly S-shaped.
They begin at the suture, in larger specimens also only at the umbilical edge, and reach the greatest height at the outer third of the winding. They are roof-shaped, with the anterior slope steeper than the posterior.
Remarkable is the progression over the external side: some ribs do not weaken, others do, which gives the external side a humped appearance. In the piece shown here, every second rib is quite regularly weakened.
The cross-section of the coils is almost circular when young, similar to W. waehneri, but later becomes distinctly oval.
* Description according to Lange (1952), supplemented
This rare species has a characteristic ribbing, distinguishing it from all other species in this period.
Compared to Waehneroceras waehneri the navel width is smaller.
Dimension
Dimensions with D= 45mm
Nw % v. D: ca. 48%
Wh % v. D: ca. 24%
Wb % v. D: ca. 20%
Literature
- 1952 Psiloceras (Waehneroceras) curvicorne sp. n. – Lange, S. 110, Taf. 13.8-10
- 1963 Psiloceras (Curviceras) curvicorne Lange – Blind, S. 49, Taf. 1.24
