👉 A tachinarian is a type of animal that has an internal organ system similar to that of a fish, but without fins. The body structure and functions are similar to those of the fish, but they have no backbone or backbones. Tachinarians can live in water, air, or even on land, depending on their environment. Tachinarians include many different species, including some that are known for their unique adaptations, such as the ability to swim and breathe underwater,