Long termism doesn't have to be just increased lifespans. The concept of "double death" might be helpful here. Death of a human might be when a human's heart stops. But their double death might be the last time someone says their name or the last time some important idea of theirs gets reproduced (or stops being reproducible, like if the last copy of an important artwork they made gets destroyed). The death of thousands of beetles can happen, but when the ecosystem they rely on to reproduce gets damaged to the point where it can't recuperate, that might be called their double death