Ephysteris is a genus of the twirler moth family (Gelechiidae). Among these, it is assigned to tribe Gnorimoschemini of the subfamily Gelechiinae. Even though it is a rather diverse and widespread group, most of these small and inconspicuous moths were overlooked by scientists until the early 20th century. Almost 90 species are known today, but new ones are still being discovered. These moths typically have forewing veins 2 and 3 separate but veins 6-8 originating from a common stalk. Somewhat less characteristically, their labial palps have a pointed tip and a furrow on the second segment.