Fig. 5

Comparison of mbe.9305 (black triangle), and mbe.1401 (black square) with dimensional shell parameters of Peltoceras athleta databased by Bonnot [25]. [M]: Variation of the umbilicus length (A); height (B), and thickness of the whorl (C) with the diameter. [m]: Variation of the umbilicus length (D); height (E), and thickness of the whorl (F) with the diameter. G compile the coiling variability of both Peltoceras athleta macro-, and microconchs databased by Bonnot [25], and show the position of the studied specimens