Parathecabius stammeri Zwölfer 1957 = Mordvilkoja vagabunda (Walsh, 1863)

Paratypes of stammeri in the BMNH collection from roots of Lysimachia vulgaris in Germany agree well with exules of Mordvilkoja vagabunda from Lysimachia spp. in North America, which were unknown until Smith (1971) discovered its life cycle. This aphid has a sexual phase on native North American Populus of the deltoides group. The population in Germany was anholocyclic (Zwölfer 1957).