First record of a female stylopid (Strepsiptera : ?Myrmecolacidae) parasite of a prionomyrmecine ant (Hymenoptera : Formicidae) in Baltic amber

A female stylopid parasitising an ant of the genus Prionomyrmex (Hymenopter a: Formicidae) is described and illustrated from Baltic amber (Eocene, 39-5 0 million years old). This new fossil is tentatively considered as a plesio morphic member of the Myrmecolacidae. Recent Myrmecolacidae parasitise dual hosts: males parasitise Formicidae, while females parasitise either Mantod ea or Ensifera. This is the first record of a female stylopid parasitising Formicidae. The phylogenetic relationships of the Myrmecolacidae and the or igin of their unique dual host relationship are discussed.