Abstract
The final instar larva of Progomphus joergenseni is described and illustrated for the first time based on specimens collected in Río Negro Province, northern Patagonia, Argentina. Right mandibular molar crest shows an extreme reduction in the number of teeth with no intermediates between teeth a and b. Antennal, leg and paraprocts morphology suggest a close relationship with the species included in the Pygmaeus group, but P. joergenseni differs from them because of its larger size and longer anal pyramid.References
Belle, J. (1973) A revision of the New World genus Progomphus Selys, 1854 (Anisoptera, Gomphidae). Odonatologica, 2 (4), 191–308.
Belle, J. (1991) The ultimate instar larvae of the Central American species of Progomphus Selys, with a description of P. belyshevi spec. nov. from Mexico (Anisoptera: Gomphidae). Odonatologica, 20 (1), 9–27.
Belle, J. (1992) Studies on ultimate instar larvae of neotropical Gomphidae, with the description of Tibiagomphus gen. nov. (Anisoptera). Odonatologica, 21 (1), 1–24.
Garrison, R.W., Von Ellenrieder, N. & Louton, J.A. (2006) Dragonfly Genera of the New World. An illustrated and annotated key to the Anisoptera. The Johns Hopkins University Press, Baltimore, 368 pp.
Limongi, J. (1983) Estudio morfo-taxonómico de náyades en algunas especies de Odonata (Insecta) en Venezuela. Memorias de la Sociedad de ciencias naturales “La Salle”, 43 (119), 95–117.
Muzón, J. (2009) Estado actual del conocimiento del orden Odonata en la Patagonia. Revista de la Sociedad Entomológica Argentina, 68 (1–2), 163–167.
Muzón, J., Spinelli, G.R., Pessacq, P., Von Ellenrieder, N., Estevez, A.l., Marino, P.I., Perez Goodwyn, P.J., Angrisano, E.B., Diaz, F., Fernández, L.A., Mazzuconi, S., Rossi, G. & Salomón, O.D. (2005) Insectos acuáticos de la Meseta del Somuncura, Patagonia, Argentina. Inventario preliminar. Revista de la Sociedad Entomológica Argentina, 64 (3), 47–67.
Muzón, J., Spinelli, G.R., Rossi, G.C., Marino, P.I., Diaz, F. & Melo, M.C. (2010) Nuevas citas de insectos acuáticos para la Meseta de Somuncurá, Patagonia, Argentina. Revista de la Sociedad Entomológica Argentina, 69 (1–2), 1–6.
Needham, J.G. (1941) Life history studies on Progomphus and its nearest allies (Odonata: Aeschnidae). Transactions of the American Entomological Society, 67, 221–245.
Paulson, D.R. (1977) Odonata. In: Hurlbert, S.H. (Ed), Biota Acuática de Sudamérica Austral. San Diego State University, San Diego, pp. 170–184.
Santos, N.D. (1968) Contribucao ao conhecimento da fauna do Estado da Guanabara. 61. Notas sobre a ninfa de Progomphus complicatus (?) Selys, 1854 e seu imago (Gomphidae, Odonata). Atas da Sociedade de Biologia de Rio de Janeiro, 11 (5), 171–174.
Von Ellenrieder, N. & Garrison, R.W. (2007) Libélulas de las Yungas (Odonata). Una guía de campo para las especies de Argentina. Dragonflies of the Yungas (Odonata). A field guide to the species from Argentina. Pensoft Publishers, Sofia, 116 pp.
Von Ellenrieder, N. & Muzón, J. (2008) An updated checklist of the Odonata from Argentina. Odonatologica, 37 (1), 55–68.
Watson, M.C. (1956) The utilization of mandibular armature in taxonomic studies of anisopterous nymphs. Transactions of the American Entomological Society, 81, 155–202.