Revision of Scopaeus Erichson, 1839 (Coleoptera, Staphylinidae, Paederinae) of Indonesia, with description of 19 new species Author Frisch, Johannes Author Narakusumo, Raden Pramesa MUseUm ZoologicUm Bogoriense, Research Center for Biosystematics and EvolUtion, National Research and Innovation Agency (BRIN), Jl. Raya Jakarta-Bogor KM 46, Cibinong, West Java, 16911, Indonesia text Soil Organisms 2022 2022-04-01 95 1 23 73 http://dx.doi.org/10.25674/so95iss1id311 journal article 10.25674/so95iss1id311 2509-9523 10724236 Scopaeus riedeli Frisch , spec. nov. ( Figs 4 , 29 , 56 –58 , 121 ) Type specimen: Holotype ♂ , Indonesia , Sumatra , Lampung , South Lampung , SO Kalianda : Rajabasa Mts ( 05°46.656’S , 105°37.478’E ), 1170 m , 15.8.2006 , leg. Riedel ( MZB ). Description: Habitus and coloring ( Fig. 4 ) like in brachypterous, dark colored Scopaeus javanus ( Fig. 1 ) and S. batukaruensis ( Fig. 3 ). Holotype ( Fig. 4 ) brachypterous, without palisade fringe. Total body length 2.9 mm ; forebody length 1.6 mm . Male: Abdominal sternites VII and VIII ( Fig. 121 ) as in S. javanus ( Fig. 119 ) and S. batukaruensis ( Fig. 120 ). Aedeagus ( Figs 29 , 56 – 58 ) 0.7 mm long, distinguished from that of S. javanus and S. batukaruensis by ventrally inemarginate ( Fig. 56 : arrow I), apicolaterally widened apical lobes ( Fig. 57 : arrow III , Fig. 58 ); different from aedeagus of S. javanus moreover by narrow, not lobiform apex of dorsal lobe ( Fig. 56 : arrow II ). Female unknown. Distribution: Scopaeus riedeli is known from the south of Sumatra only. Etymology: The epithet riedeli (Latinized noun, derived from the surname ‘Riedel’, genitive, singular) is chosen in honor of Alexander Riedel, specialist of Indonesian Curculionidae at Staatliches Museum für Naturkunde Karlsruhe, Germany , who collected this new species in Sumatra. Comment: Scopaeus javanus , S. batukaruensis and S. riedeli form a species group with allopatric distribution in the Sunda Islands. The species are linked by the similar habitus, wing-dimorphism ( Figs 1 – 4 ) and the characteristic shape of the aedeagus with a strongly ventrad curved, from the apical lobes strongly projecting, distally extended dorsal lobe ( Figs 27 – 29 , 50 – 58 ).