| Measurements | D mm | H/D | T/D | O/D | H/T |
|---|---|---|---|---|---|
| 2577 Saveliev | 33 | 0.48 | 0.34 | 0.17 | 1.41 |
| 4088 Saveliev | 45.5 | 0.51 | 0.35 | 0.19 | 1.46 |
| CP-105 | 55.5 | 0.49 | 0.35 | 0.21 | 1.42 |
| 1182 Saveliev holotype | 60.8 | 0.43 | 0.34 | 0.26 | 1.26 |
| 4089 Saveliev | 67 | 0.45 | 0.33 | 0.18 | 1.36 |
| Age | Origin |
|---|---|
|
Phophatic nodules, level condensing the kitchini to puzosianus zones Lower Albian |
Machéroménil Ardennes France |
Description. A reworked specimen, in black phosphate with remains of coppery shell, comprising a half-whorl and a non-contiguous fragment of the next whorl. It is involute and highly compressed, with whorls that overlap by 60% and increase rapidly in height. The ogival section has a narrow, arched venter. The 60° umbilical wall gradually transitions to the flank. The maximum thickness is reached at the inner third of the whorl's height. On the external whorl fragment, it is reached at mid-flank. On the half-whorl, five widely spaced, very elongated umbilical bullae, give rise to bundles of two or three fine, prominent sigmoid ribs that cross venter with a strong sinus at 90°. There are 20 ribs in total, including 10 distinctly shorter isolated ribs. Most often, there are two isolated ribs between two consecutive pairs. This specimen corresponds well to the description in Russian by Saveliev (1992).
Remarks. Personal discovery. Species found in the Anglo-Paris Basin (first report here) and Mangystau. The specimen comes from the famous level of "coquins" (phosphate nodules) of Machéromesnil in the Ardennes, which provided d'Orbigny with numerous species. This level condenses the upper part of the kitchini zone, the floridum and puzosianus zones, and the beginning of the subhilli zone. Along with Sonneratia (Eosonneratia) tenuis, which is found in the same levels, it is the only Sonneratia with a very compressed oval whorl section and a narrow arched venter. It differs from the latter by fewer umbilical tubercles (10 versus 15 in tenuis), which are widely spaced, and more simple ribs (19-22 versus 12-15 in tenuis). This majority of simple ribs is unique at this diameter among the Sonneratia.