👉 In marine biology, a palaeichthyan is a type of fish that has been found in ancient times. Palaeichthyan refers to any species from the Paleozoic and Mesozoic periods, which are the geological epochs before the Cambrian explosion (about 548 million years ago). These animals were not part of today's known marine life but lived on land during this time. Palaeichthyan fossils have been found in various locations around the world, including
