seppo is an extinct genus of spiders, possibly of the superfamily palpimanoidea, that lived about 180 million years ago, in the early jurassic (lower toarcian) of what is now europe. the sole species seppo koponeni is known from a single fossil from grimmen, germany. with the scorpion "liassoscorpionides", it is one of the two only known arachnids from the lower jurassic of germany.