Angustidens

Angustidens is a genus of extinct ray-finned fish that lived during the Late Jurassic epoch. Fossils of Angustidens have been found in Europe. This genus is characterized by its distinctive dentition, which gives it its name, meaning "narrow tooth." The teeth of Angustidens are typically small, numerous, and set in a narrow band on the jaws.

The body shape of Angustidens suggests it was likely a pelagic or semi-pelagic fish, meaning it lived in the open water column rather than on the seafloor. Its fins were probably adapted for active swimming. Based on the fossil evidence, paleontologists believe Angustidens was a carnivore, likely feeding on small invertebrates or planktonic organisms. Its narrow teeth would have been effective for grasping and tearing small prey.

Angustidens belongs to the order Pachycormiformes, a group of Mesozoic fishes that were diverse and widespread. While the exact evolutionary relationships within Pachycormiformes are still debated, Angustidens represents a specialized lineage within this ancient group. The study of Angustidens contributes to our understanding of fish diversity and evolution during the Jurassic period, a time when marine ecosystems were undergoing significant changes. The limited fossil record means that much about its specific lifestyle and ecological role remains subject to ongoing research.