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New data on the genus  Elephantomyia  (Diptera: Limoniidae) from Baltic amber are presented. A new subgenus  Hoffeinsonia  subgen. nov. is established with one new species:  Elephantomyia  ( Hoffeinsonia )  prima  sp. nov. The new subgenus is characterized by a wing at most 2.5 × as long as it is wide without a darker pattern along the veins Sc and R 1 , elongate Sc, straight vein R 1 , sharp half of vein R 2+3+4  sharply arched to the upper edge of the wing, short, wide, trapezoidal d-cell and oval pterostigma. The fossil subgenus  Hoffeinsonia  subgen. nov. shares features with the extant subgenera  Elephantomyodes  and  Elephantomyia . One other extinct species of  Elephantomyia  was discovered and described herein as  E.  (s. str.)  christelae  sp. nov. Such features as a very elongate vein R 2+3+4 , 2.5 × as long as the Rs easily allowing this new species to be distinguished from the other fossil representatives of the genus  Elephantomyia . The taxonomic decision on  Elephantomyia grata  as a species placed in nominative subgenus is provided. A list and key of fossil species of  Elephantomyia  are given. The morphological pattern of the genus is discussed in relation to the adaptation to a specific food spectrum, coevolution with Angiospermae of the representative genus  Helius  known since Cretaceous and closely related to this genus representatives of the much younger genus  Elephantomyia .

Recent discoveries of new Elephantomyia (Diptera, Limoniidae) fossils in Baltic amber