A Revision of fossil Bibionidae (Insecta: Diptera) from the Oligocene of Germany Author Skartveit, John 0000-0001-7614-3399 Author Wedmann, Sonja 0000-0002-9778-4125 edmann@senckenberg.de text Zootaxa 2021 2021-01-19 4909 1 1 77 journal article 8640 10.11646/zootaxa.4909.1.1 fa031765-b474-48aa-9d7e-b62dd092cfa4 1175-5326 4448697 92ECCF97-7315-4A1A-A94A-537D0F331EBF Penthetria sp. 2 (figs. 16, 102) Penthetria ♂ Nr. 2 Statz 1943: 41–42 . Localities : Rott. Material examined : LACMIP 2533.247ab/LACMIP Type 3377. The specimen is represented by a single, poorly preserved male specimen from Rott. This specimen is characterized mainly by its small size, with a wing length of only 4.3 mm , but does not exhibit sufficient characters to warrant a formal species description. Its size does, however, distinguish it from all other known fossil Penthetria . The strongly curved R 4+5 could suggest that the species should be placed in genus Hesperinus , however the relatively large head is unlike those usually found in that genus. Description : Female unknown. Male (N=1, figs. 16, 102): Total length 5.4 mm , specimen entirely brown (probably not original colour) Head: Length 0.76 mm , width 0.76 mm . No details discernible, antennae and palpuss not preserved. Thorax: Length 1.3 mm , dorsally relatively flat. Scutellum small, not prominent. Haltere brown. Pile not preserved. Wing (fig. 102): Length 4.3 mm , width 1.7 mm , length/width = 2.6. Light brownish (possibly hyaline in life), veins brown, distinctive, radial veins strong, posterior veins much finer. Humeral ven present, vertical. Subcosta straight, distinctive. Pterostigma oval, brown, distinctive. R 2+3 rather long, almost straight. R 4+5 apically rather strongly curved. Crossvein R-M slightly oblique. Vein measurements are given in Table 3 . Legs: Brown, slender, relatively short. Fore tibia 1.1 mm long, 0.11 mm wide. Abdomen: cylindrical, 3.8 mm long, 0.8 mm wide. Pile not preserved. Terminalia: Poorly preserved. Gonostylus apparently relatively slender.