👉 The term "Nautiliales" refers to a group of animals that were once widespread on Earth, but have since become extinct due to overfishing and habitat destruction. These animals are characterized by their large size, streamlined body shape, and ability to swim through water relatively easily. They played an important role in the Earth's ecosystem as primary feeders for other marine species, and their extinction led to a significant loss of biodiversity on land and in oceans around the world.