01562nas a2200193 4500008004100000245008900041210006900130300001400199490000900213520098400222653002001206653001201226653002201238653001601260653001301276100002001289700001501309856004401324 2021 eng d00aA new minute riffle beetle (Coleoptera: Elmidae: Pagelmis) from the Brazilian Amazon0 anew minute riffle beetle Coleoptera Elmidae Pagelmis from the Br a369–3760 v50613 a

The monotypic genus Pagelmis Spangler, 1981 was described from six thousand specimens of Pagelmis amazonica Spangler, 1981 collected with blacklight traps in Ecuador. For many years the known distribution of this genus was restricted to its type-locality, and recently it was recorded in Venezuela, Suriname and Brazil (Roraima State). Now, 40 years after the description of the genus, we describe the second Pagelmis species, based on male and female collected in the Amazon forest (Amazonas State, Brazil).With the description of the second species in the genus we provide an emended diagnosis of Pagelmis. Since adults of this genus were previously collected only in light traps, no habitat information was known. We collected adults of the new species in the first- and second-order streams with black, acidic water and sandy streambeds. The main substrates available in these streams were leaves and roots of riparian vegetation.

10aaquatic insects10aElminae10aemended diagnosis10aNeotropical10ataxonomy1 aPolizei, T.T.S.1 aHamada, N. uhttps://elmidae.myspecies.info/node/192