An extinct group of armored fish from the Paleozoic era with curved, hook-like jaw structures.
From Greek 'drepane' (sickle) and 'aspis' (shield), referring to the sickle-shaped armor plates found on these ancient fish.
These creatures lived 400+ million years ago and had some of the first jaws in vertebrate evolution—their curved teeth were an early experiment in predatory design that eventually led to all modern fish, reptiles, birds, and mammals.
Complete word intelligence in one call. Free tier — 50 lookups/day.