02024nas a2200265 4500008004100000245012000041210006900161300001400230490000700244520124300251653001201494653001301506653001001519653002401529653001401553653001601567653001301583653001801596653001301614100001601627700003501643700001901678700001701697856004401714 2022 eng d00aMolecular phylogeny of the riffle beetle genus Hexanchorus revealed a presence of a new genus (Coleoptera: Elmidae)0 aMolecular phylogeny of the riffle beetle genus Hexanchorus revea a575–6020 v803 a

The riffle beetle genus Hexanchorus Sharp is, with 25 known species, the most speciose genus of the subfamily Larainae in the Neotropics and the second largest globally. An analysis of its phylogeny, based on two mitochondrial (COI, 16S) and two nuclear (18S, 28S) markers, including Hexanchorus-like, but morphologically distinct specimens, supported presence of an unknown genus. The new genus, Rumilara gen. nov., is described here with four new species (R. obscura sp. nov., R. paterna sp. nov., R. riberai sp. nov., R. suppressa sp. nov.) and their larvae. The separate position of the new genus is, beside molecular differences, well substantiated by the morphology of adults (the absence of sexual dimorphism, structure of the pronotum) and larvae (pleurites never reaching to sixth abdominal ventrite). H. sagittatus stat. nov. is elevated to species rank based on molecular data, and Rumilara leleupi (Delève) comb. nov. is transferred from the genus Hexanchorus and redescribed, based on its morphology.

10aEcuador10aLarainae10alarva10amolecular phylogeny10anew genus10anew species10aRumilara10aSouth America10ataxonomy1 aLinský, M.1 aČiamporová-Zaťovičová, Z.1 aLaššová, K.1 aČiampor, F. uhttps://elmidae.myspecies.info/node/20101691nas a2200217 4500008004100000245011500041210006900156300001300225490000800238520102300246653002001269653001601289653001401305653001601319653001801335653001801353100002001371700002001391700001801411856004401429 2022 eng d00aSpanglerelmis, a new genus of Elmidae (Insecta: Coleoptera) from Brazil with new species and biological notes0 aSpanglerelmis a new genus of Elmidae Insecta Coleoptera from Bra a33–56 0 v8133 a

In this study, the new genus Spanglerelmis Polizei & Bispo is described; Microcylloepus ochus Hinton, 1940 is synonymized with Microcylloepus femoralis Hinton, 1940, and transferred to the new genus; and two new species, S. xiririca gen. et sp. nov. and S. timburi gen. et sp. nov. are described. The new genus can be characterized by the combination of the following characters: 1) pronotum without transverse, longitudinal or oblique impressions, sulci or gibbosities on disc; 2) elytra with a carina on interval III and two sublateral carinae on intervals V and VI; 3) mesoventrite with sides strongly raised; and 4) femora with an oblique belt of tomentum dorsally and a transverse belt ventrally. The specimens of the two new species were collected mainly in riffes of unimpacted streams in the Atlantic Forest in São Paulo State, Brazil. Scanning electron microscope images, an identifcation key for the genus and habitat notes are also presented.

10aaquatic beetles10aNeotropical10anew genus10anew species10ariffe beetles10aSouth America1 aPolizei, T.T.S.1 aCosta, L.d.S.M.1 aBispo, P.d.C. uhttps://elmidae.myspecies.info/node/198