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With only about 600 described extant species, the twisted-winged parasites (Strepsiptera) are a small, parasitic group of holometabolous insects. Fossil records of Strepsiptera are rare, but in the last years the knowledge of the stem group has greatly increased with the discovery of well-preserved species from Cretaceous Burmese amber and Eocene Baltic amber. With very few exceptions, such as a fossil primary larva from Burmese amber and a late female larval stage of the - Mengeidae from Baltic amber, only males are known. These amber fossils have greatly contributed to the understanding of the evolution of Strepsiptera in the late Mesozoic and Cenozoic. The stem group representatives of the twisted-winged parasites are described and placed in an evolutionary context. [ABSTRACT FROM AUTHOR]

We describe two new extinct caddisflies, Electroadicella kuenowi sp. nov. and Triaenodes simoni sp. nov., embedded in Baltic amber. Both species belong to the tribe Triaenodini and enlarge the family Leptoceridae to a remarkable number of 18 extinct Eocene species from Baltic amber. The extinct Electroadicella and the extant Triaenodes are possibly closely related, by a distinct synapomorphy, a recurved process from the basal plate of the inferior appendages of the ninth abdominal segment in the male genitalia. [ABSTRACT FROM AUTHOR]

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