01376nas a2200169 4500008004100000245010800041210006900149300001000218490000900228520083000237653001901067653002001086653002301106653001801129100001601147856004301163 2012 eng d00aElachistelmis gen. n. (Coleoptera: Elmidae: Elminae) from Suriname, with description of two new species0 aElachistelmis gen n Coleoptera Elmidae Elminae from Suriname wit a61-690 v35003 a

Elachistelmis gen. n. is described for two new species of riffle beetle, E. tetramera sp. n., and E. sipaliwiniensis sp. n. from southwestern Suriname. This new genus can be distinguished from all other elmid genera by its small size (ca. 1.0–1.2 mm), pronotum with sublateral carinae and lacking depressions, and the presence of a narrow band of plastron setae on the lateral edge of each elytron. Elachistelmis tetramera sp. n. is among the smallest recorded Elmini and possesses many characters associated with miniaturization, such as reduced tarsal formula and feathery wings with reduced venation. A key to species, scanning electron micrographs, and illustrations of the male genitalia are provided.

10aAquatic insect10aminiaturization10aNeotropical region10ariffle beetle1 aMaier, C.A. uhttps://elmidae.myspecies.info/node/8401436nas a2200193 4500008004100000245015900041210006900200300001400269490000700283520078900290653002001079653001801099653001501117653001901132653001301151100002001164700001501184856004301199 2012 eng d00aDescription and notes on the bionomics of a new species of Potamophilops Grouvelle, 1896 (Coleoptera: Elmidae: Larainae), from the Cerrado biome in Brazil0 aDescription and notes on the bionomics of a new species of Potam a717–7270 v463 a

Potamophilops bragaorum sp. nov. is described and illustrated based on adult specimens collected in a mountainous area in the Cerrado biome in Taquaruçú district, Tocantins state, Brazil. This is the second species described in the genus and it represents the northernmost record of Potamophilops, which is known only from Argentina and Brazil. In this article we provide a diagnosis, details on the morphology and images of the habitus and structures used to determine the species and to distinguish the gender. Field observations permitted the description of some aspects on the biology of the new species that seem to be very similar to those of other Larainae genera. Examination of gut contents revealed a diet based mostly on periphyton.

10aaquatic insects10aCerrado biome10aNeotropics10ariffle beetles10ataxonomy1 aFernandes, A.S.1 aHamada, N. uhttps://elmidae.myspecies.info/node/6901597nas a2200193 4500008004100000245010700041210006900148300001000217490000900227520100200236653002001238653002001258653001201278653001301290100001801303700002001321700001901341856004301360 2012 eng d00aTwo new species of Austrolimnius Carter & Zeck (Insecta: Coleoptera: Elmidae) from Southeastern Brazil0 aTwo new species of Austrolimnius Carter Zeck Insecta Coleoptera  a14-240 v33893 a

The genus Austrolimnius Carter & Zeck has its greatest known diversity in Oceania, but its fauna in the Americas is poorly known. In this paper, two new species—Austrolimnius uncatus sp. nov. and A. bocainensis sp. nov.—are described and illustrated based on adult specimens collected at Serra da Bocaina National Park, São José do Barreiro Municipality, São Paulo State, and Nova Friburgo Municipality, Rio de Janeiro State, Brazil. Austrolimnius uncatus sp. nov. is characterized by the long setae on the mesotarsus, the medial expansion of the hind tibiae, and the hook-like shape of the male genitalia. Austrolimnius bocainensis sp. nov. can be recognized by the absence of setae on the mid-tarsus, the cylindrical hind tibiae, and the slightly curved genitalia with few setae. A pictorial key for the Brazilian species of the genus is given. New records of Brazilian species of the genus are reported.

10aaquatic insects10aAtlantic forest10aElminae10ataxonomy1 aMiranda, G.S.1 aSampaio, B.H.L.1 aPassos, M.I.S. uhttps://elmidae.myspecies.info/node/66