| Measurements | D mm | H/D | T/D | O/D | H/T |
|---|---|---|---|---|---|
| CP-655 | 35.3 | 0.46 | 0.29 | 0.24 | 1.58 |
| CP-118 | 36 | 0.44 | 0.30 | 0.24 | 1.49 |
| Holotype Bully | 64 | 0.39 | 0.32 | 0.31 | 1.23 |
| Age | Origin |
|---|---|
|
Grey clay H. (I.) steinmanni zone Lower Albian |
Mesnil-Saint-Père Aube France |
| Measurements | D mm | H/D | T/D | O/D | H/T |
|---|---|---|---|---|---|
| CP-655 | 35.3 | 0.46 | 0.29 | 0.24 | 1.58 |
| CP-118 | 36 | 0.44 | 0.30 | 0.24 | 1.49 |
| Holotype Bully | 64 | 0.39 | 0.32 | 0.31 | 1.23 |
| Age | Origin |
|---|---|
|
Grey clay H. (I.) steinmanni zone Lower Albian |
Mesnil-Saint-Père Aube France |
Description. A compressed, pyritic, fully septate specimen, septate, with whorls of high trapezoidal section, 55% covered, and nearly flat flanks becoming slightly convex near the flattened venter. The umbilicus, over a quarter of shell diameter, has a rather low wall, sloping at 45°, connected to the flank by a narrowly rounded margin. This margin bears 15 small but prominent umbilical tubercles, elongated towards the venter and very proverse. These give rise to bundles of 2 or 3 fine ribs, arched at the beginning of last whorl, then flexuous with the shape of an integral, which curve forward in the outer third of the flanks and terminate in small, oblique elevations, alternating on either side of the siphonal line. There are a total of 45 closely spaced ribs, including some shorter intercalatories.
Remarks. Personal discovery. This late and uncommon Otohoplites may have a few simple or lautiform ribs. It is found at the top of the subhilli zone and the bottom of the steinmanni zone, in the Paris Basin, Switzerland, and Poland (Amédro et al., 2014). It is highly variable, and some specimens from Destombes et al. (1974) are thicker than ours. In general, the ribs are more curved forward near the venter than on CP-118. O. normanniae is often confused with Hoplites dentatus. The latter, more recent, has ribs that curve forward but are not flexuous, with higher terminations that define a ventral groove. Distinguishing between them is difficult until around 2 cm because the ribs of the former are not yet sigmoid (cf. the beginning of the last whorl of CP-118), while the latter does not yet have a distinct sulcus. However, a definitive answer is possible if the collection level is known: in our case, the ammonite was found with a Hoplites (Isohoplites) steinmanni, which confirms the identification.