title: Description of the final instar larva of Rhionaeschna vigintipunctata (Ris, 1918) (Odonata: Aeshnidae).
abstract: The final instar larva of Rhionaeschna vigintipunctata (Ris) (Odonata, Aeshnidae) is described for the first time. The description is based on a series of mature female larvae collected in Tucumán (NW Argentina) and reared to imago. It shares the U-shaped distal excision of epiproct with other larvae of the Marmaraeschna group (only R. pallipes and R. brevicercia known from this stage); but the minute tubercle at each side of the cleft of ligula is absent. Other characters unique to R. vigintipunctata include: open ligula (vs. closed in other "Marmaraeschna"), and mandibular formula. A table to distinguish the larvae of the three species of "Marmaraeschna" and biological and distributional data of R. vigintipunctata are included.
authors.affiliation: Instituto de Biodiversidad Neotropical, CONICET (Argentine Council of Scientific Research), Facultad de Ciencias Naturales e IML, Universidad Nacional de Tucumán, M. Lillo 205, 4000, San Miguel de Tucumán, Argentina.; Email: josephum@hotmail.com.
authors.forename: José Sebastián
authors.initials: JS
authors.lastname: Rodríguez
authors.affiliation: Instituto de Biodiversidad Neotropical, CONICET (Argentine Council of Scientific Research), Facultad de Ciencias Naturales e IML, Universidad Nacional de Tucumán, M. Lillo 205, 4000, San Miguel de Tucumán, Argentina.; Email: carlosmolineri@gmail.com.
authors.forename: Carlos
authors.initials: C
authors.lastname: Molineri
mesh_terms: D000818:Animals; D001118:Argentina; D005260:Female; D007814:Larva / Q000033:anatomy & histology*; D008297:Male; D063191:Odonata / Q000033:anatomy & histology* / Q000145:classification