Fig. 5

Fragmentary conch of a perisphinctid with complete jaw apparatus (Praestriaptychus) next to it from the late Kimmeridgian of Nusplingen (SMNS 70613). The facts that upper and lower jaws are still in contact (insert with modified brightness to show the arrangement of the upper jaw), that the buccal mass is so close to the damaged conch that all parts likely belonged to the same species, and the dark stain between these parts suggest that they were parts of the same individual