Additional new species of Grouvellinus Champion 1923 (Insectaı Coleopteraı Elmidae) discovered by citizen scientists and DNA barcoded in the field applying a novel MinIONbased workflow Author Freitag, Hendrik Author Molls, Christian Author Bouma, Aglaia M. Author Garces, Jhoana M. Author Rossato, Marzia Author Cosentino, Emanuela Author Delledonne, Massimo text Journal of Natural History 2019 2020-01-24 53 41 2593 2620 journal article 24056 10.1080/00222933.2019.1709669 175ef2e7-06f6-4404-a6be-224dac1a06ec 1464-5262 3666538 Grouvellinus sp. 1 ( Figure 8 ) Material examined. 1♀ [H2] (SP) ‘ MALAYSIA : Sabah : Tawau River ; Light trap near Park Headquarter ; ca. 4°24 ʹ 14 ʹʹ N , 117°53 ʹ 35 ʹʹ E , 270 m a.s .l.; leg. Taxon Expedition participants 12.March.2018 (1)L ’ . Remarks This undoubtedly new species is represented by a single female specimen in our collection from the light trap at Tawau River. It appears most similar in proportion, elytral shape and size to Grouvellinus borneensis sp. nov. , but differs externally by the bluish-purple metallic shine and a more rugose pronotum. It possesses the distinct rugulose elongate elytral patches between intervals 1 and 3 as also seen in females of the former species (comp. Figures 8 , 16 (b)). CL: 1.7 mm ; EW: 0.8 mm . Due to the lack of male specimens and their aedeagi as the most distinctive morphological character,we refrain from a formal description. However, we provide an mtDNA barcode for comparison with any additional material to be described in the future: LR738837 .The barcode of this specimen varies at least 14.6% from all other known Grouvellinus species of Borneo.