Abstract
Neoelmis guarani new species is described and illustrated from specimens collected in streams of the Cordillera de los Altos, southeast of Asunción and near the towns of Piribebuy and Chololó, Paraguay. Males and females of this species exhibit strong secondary sexual dimorphism not found in other known species of Neoelmis. Males have striking modifications of the pro- and mesothoracic legs and bear a pair of ventrally projecting processes on both the mesoventrite and the second abdominal ventrite. Females have the elytra modified with a pair of dorsal projections.
References
Hinton, H.E. (1939) On some new and little known South American Neoelmis Musgrave (Coleoptera, Elmidae). The Entomologist’s Monthly Magazine, 75, 228–234.
Hinton, H.E. (1940a) A synopsis of the Brazilian species of Neoelmis Musgrave (Coleoptera, Elmidae). The Annals and Magazine of Natural History, Series 11, 5 (26), 129–153.
Hinton, H.E. (1940b) A monographic revision of the Mexican water beetles of the family Elmidae. Novitates Zoologicae, 42 (2), 217–396.
Hinton, H.E. (1972) New species of Neoelmis from South America (Coleoptera, Elmidae). Papéis Avulsos de Zoologia, 26 (9), 117–135, pls. I–II.
Manzo, V. (2005) Key to the South American genera of Elmidae (Insecta: Coleoptera) with distributional data. Studies on Neotropical Fauna and Environment, 40 (3), 201–208.
http://dx.doi.org/10.1080/01650520500140619Manzo, V. & Archangelsky, M. (2012) Two new species of Elmidae (Coleoptera) from Argentina. Zootaxa, 3478, 267–281.
Shepard, W.D. & Aguilar Julio, C.A. (2010) Estudio preliminary de las familias de escarabajos acuáticos Dryopidae, Elmidae, Lutrochidae y Psephenidae conocidos de Paraguay (Coleoptera: Byrrhoidea). Boletin de la Museo Nacional de Historia Natural del Paraguay, 16 (1), 30–42.