title: Neoelmis guarani Shepard & Barr, a sexually dimorphic new species from <br />Paraguay (Insecta: Coleoptera: Elmidae: Elminae).
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.
authors.affiliation: Essig Museum of Entomology, 1101 Valley Life Sciences Bldg. #4780, University of California, Berkeley, CA 94720 USA.; Email: william.shepard@csus.edu.
authors.forename: William D
authors.initials: WD
authors.lastname: Shepard
authors.affiliation: Essig Museum of Entomology, 1101 Valley Life Sciences Bldg. #4780, University of California, Berkeley, CA 94720 USA.; Email: cbarr@berkeley.edu.
authors.forename: Cheryl B
authors.initials: CB
authors.lastname: Barr
mesh_terms: D063147:Animal Distribution; D000825:Animal Structures / Q000033:anatomy & histology / Q000254:growth & development; D000818:Animals; D049628:Body Size; D001517:Coleoptera / Q000033:anatomy & histology / Q000145:classification / Q000254:growth & development / Q000502:physiology*; D017753:Ecosystem; D005260:Female; D008297:Male; D009929:Organ Size; D010239:Paraguay; D012727:Sex Characteristics