Abstract
Amazonopsisgen. n. is described to include A.theranyisp. n. from Peru, Venezuela and French Guiana, and A.camachoisp. 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. Amazonopsistheranyi exhibits pronounced secondary sexual dimorphism which likewise may be a characteristic of the genus. Amazonopsis males have modified 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 unmodified claws; females of A.camachoi are unknown. Descriptions are furnished of the stream habitats and microhabitats where the study specimens were collected.
Highlights
40 genera and over 250 species of the aquatic beetle family Elmidae are known from South America (Manzo 2005, Maier and Spangler 2011, Maier 2012), including 25 genera and 102 species from the Amazon region (Passos et al 2010)
The purpose of this paper is to describe this distinctive new genus of elmid, its two new species, and the stream habitats from which they were collected
Four specimens collected by the Stroud–ACEER project in Peru were taken from artificial leaf packs, consisting of plastic mesh bags filled with 7 g of fresh Inga edulis Martius (Fabaceae) leaves, which were deployed in the stream for about four weeks (Howard 2012, Sweeney 2014)
Summary
40 genera and over 250 species of the aquatic beetle family Elmidae are known from South America (Manzo 2005, Maier and Spangler 2011, Maier 2012), including 25 genera and 102 species from the Amazon region (Passos et al 2010).
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