01774nas a2200229 4500008004100000245013200041210006900173300001400242490000700256520107200263653002001335653001701355653002201372653001801394653001201412653001301424100001501437700001501452700001601467700001701483856004401500 2021 eng d00aAmazonopsis cerdani (Coleoptera: Elmidae: Elminae), a New Species of Riffle Beetle from French Guiana with Habitat Observations0 aAmazonopsis cerdani Coleoptera Elmidae Elminae a New Species of  a427–4390 v753 a

A third species of Amazonopsis Barr, 2018, Amazonopsis cerdani Barr and Cerdan, new species (Coleoptera: Elmidae), is herein described from French Guiana. One female paratype of Amazonopsis theranyi Barr from Peru is tentatively reassigned to A. cerdani as a non-paratype. Photographic images of the male and female habitus, and the male genitalia, are provided, as is a distribution map and a key to the species. Amazonopsis cerdani differs from A. theranyi from Peru and Amazonopsis camachoi Barr from Venezuela by the presence of prominent spines on protarsomeres 1–4 of males, among other characters. The habitat of this species is small, shallow, lowland streams with sandy-silty substrates and low flow. Specimens were collected from unconsolidated leaf litter in depositional areas, and from stick and leaf packs lodged in the current. Genetic analysis conducted on three specimens from two localities, a male and two females, showed that they are conspecific.

10aaquatic beetles10aDNA analysis10asexual dimorphism10aSouth America10aStreams10ataxonomy1 aBarr, C.B.1 aCerdan, A.1 aClavier, S.1 aMurienne, J. uhttps://elmidae.myspecies.info/node/19101701nas a2200217 4500008004100000245012700041210006900168300001200237490000800249520103700257653002001294653001801314653001501332653001901347653000901366653002201375653001301397653001401410100001501424856004401439 2018 eng d00aAmazonopsis, an unusual new genus of riffle beetle from South America with two new species (Coleoptera, Elmidae, Elminae)0 aAmazonopsis an unusual new genus of riffle beetle from South Ame a71–920 v8033 a

Amazonopsis gen. n. is described to include A. theranyi sp. n. from Peru, Venezuela and French Guiana, and A. camachoi sp. n. from Venezuela. The descriptions are accompanied by figures illustrating the male and female habitus of A. theranyi, the male habitus of A. camachoi, and male genitalia of both species. Amazonopsis theranyi exhibits pronounced secondary sexual dimorphism which likewise may be a characteristic of the genus. Amazonopsis males have modifed protarsal and mesotarsal claws, a pair of small spines on the anterior prosternum, and a pair of ventrally directed processes on the posterior metaventrite. Females of A. theranyi display a pair of unique, oval perforations in the cuticle of the pronotum and have unmodifed claws; females of A. camachoi are unknown. Descriptions are furnished of the stream habitats and microhabitats where the study specimens were collected.

10aaquatic beetles10aFrench Guiana10aNeotropics10aperi-Amazonian10aPeru10asexual dimorphism10ataxonomy10aVenezuela1 aBarr, C.B. uhttps://elmidae.myspecies.info/node/149