Revision of fossil Metretopodidae (Insecta, Ephemeroptera) in Baltic amber - Part 4: Description of two new species of Siphloplecton Clemens, 1915, with notes on the new S. jaegeri species group and with key to fossil male adults of Siphloplecton Author Godunko, Roman J. Author Neumann, Christian Author Staniczek, Arnold H. text ZooKeys 2019 898 1 26 http://dx.doi.org/10.3897/zookeys.898.47118 journal article http://dx.doi.org/10.3897/zookeys.898.47118 1313-2970-898-1 7B407C809E644F5995C2B3229CF78C6B 278CAE686DE65920AF5B0FE8BA1BBDC1 Siphloplecton jaegeri species group Diagnosis. Male imago: (1) eyes large, medially contiguous; (2) outer margin of foretibia with several stout, pointed setae; (3) cubital field with three long intercalary veins: one long intercalary vein connected with CuA by one or several crossveins; one pair of intercalary veins situated close to CuP and at least connected with CuA (or additionally with CuP) by a crossvein; (4) plate angulate, mediocaudally only shallowly incised; incisions with relatively small pronounced triangular projections; with or without medial projection, if present, small and bluntly pointed apically; (5) forceps relatively long; basal segment conical, without apical hump on inner margin; (6) penis stem elongated; (7) penis significantly surmounting distal end of plate, reaching 0.25−0.30 x length of forceps segment 2; (8) penis lobes elongated, apically triangular or rounded, medially contiguous, with V-shaped cleft apically. Species composition. Siphloplecton jaegeri Demoulin, 1968, Siphloplecton landolti sp. nov., Siphloplecton studemannae sp. nov., Siphloplecton sp. 5, Siphloplecton sp. 6.