Drjevællopsis

Drjevællopsis is a genus of extinct cephalopods belonging to the order Ammonoidea. These ammonites are characterized by their distinctive shell morphology, which typically exhibits a moderate to involute coiling pattern. The whorl section is often compressed, and the umbilicus can be narrow or deep. Key features that distinguish Drjevællopsis include the presence of specific ribbing patterns on the external shell surface and the unique shape of their suture lines. These sutures, which mark the internal divisions between chambers of the shell, display a complex ammonitic pattern, a hallmark of many advanced ammonoids.

Fossils of Drjevællopsis are primarily found in marine sedimentary rocks from the Late Jurassic and Early Cretaceous periods. Their geographic distribution is widespread, with significant fossil finds reported from Europe, North Africa, and parts of Asia. The paleoenvironment in which Drjevællopsis lived was likely characterized by shallow to moderately deep marine waters. As with other ammonites, Drjevællopsis served as a valuable index fossil, helping geologists to correlate rock layers and date geological formations. The extinction of Drjevællopsis, like that of all ammonites, occurred at the Cretaceous-Paleogene boundary. Their study contributes to our understanding of marine invertebrate evolution and paleoecology during the Mesozoic Era.