A new species of Stilobezzia (Acanthohelea), collected in the Nothofagus forests of the Nahuel Huapi National Park (Argentina), is described, phopographed and illustrated based on the examination of  male and female adults. The new species can be easily recognized by the elongate and narrow posteromedian projection of the male sternite 9; it is compared with S. (A.) hirsuta Ingram & Macfie. A new species, Stilobezzia (Acanthohelea) longisternalis, collected in the Nothofagus forest of the Nahuel Huapi National Park (Argentina) is described, photographed and illustrated based on the examination of male and female adults. The new species can be easily recognized by the elongate and narrow posteromedian projection of the male sternite 9; it is compared with S. (A.) hirsuta Ingram & Macfie.Fil: Cazorla, Carla Gisela. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Entomología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Spinelli, Gustavo Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Limnología "Dr. Raúl A. Ringuelet". Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Limnología; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Entomología; Argentin

Cazorla, Carla Gisela

Spinelli, Gustavo Ricardo

English

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187A new species of the genus Stilobezzia from the Nahuel Huapi National Park, Argentina (Diptera: Ceratopogonidae)Recibido: 1-II-2012; aceptado: 4-VI-2012ISSN 0373-5680 (impresa), ISSN 1851-7471 (en línea) Rev. Soc. Entomol. Argent. 71 (3-4): 187-190, 2012CAZORLA, Carla G. and Gustavo R. SPINELLIDivisión Entomología, Museo de La Plata, Paseo del Bosque s/n, 1900 La Plata, e-mail: (CGC) carlacazorla@fcnym.unlp.edu.ar, (GRS) spinelli@fcnym.unlp.edu.ar Una nueva especie del género Stilobezzia del Parque Nacional Nahuel Huapi, Argentina (Diptera: Ceratopogonidae)RESUmEN.   Una nueva especie, Stilobezzia (Acanthohelea) longisternalis, colectada en los bosques de Nothofagus del Parque Nacional Nahuel Huapi (Argentina), se describe, fotografía e ilustra en base al estudio de machos y hembras adultos. La nueva especie se reconoce fácilmente por presentar una proyección posteromediana alargada y delgada en el esternito 9 de los machos. Se compara con S. (A.) hirsuta Ingram & Macfie.PALABRAS CLAVE. Stilobezzia (Acanthohelea). Nueva especie. Bosques de Nothofagus. Argentina.ABSTRACT.   A new species, Stilobezzia (Acanthohelea) longisternalis, collected in the Nothofagus forest of the Nahuel Huapi National Park (Argentina) is described, photographed and illustrated based on the examination of male and female adults. The new species can be easily recognized by the elongate and narrow posteromedian projection of the male sternite 9; it is compared with S. (A.) hirsuta Ingram & Macfie.KEY WORDS. Stilobezzia (Acanthohelea). New species. Nothofagus forest. Argentina.INTRODUCTIONThe predaceous midge genus Stilobezzia Kieffer is a large and diverse genus of Ceratopogonidae, worldwide in distribution. The adult females are important predators on other small insects, and the immature stages are found in a wide variety of aquatic and semiaquatic habitats, including streams, lakes and ponds margins, puddles, swamps, rice fields, rock pools, and tree holes (De Meillon & Wirth, 1991; Cazorla et al., 2006). Ingram & Macfie (1931) described 10 new species of Stilobezzia from Argentinean and Chilean northern Patagonia that are placed in the subgenus Acanthohelea Kieffer (Wirth & Grogan, 1988), which is represented in the Neotropical region by 27 species (Cazorla & Spinelli, 2012). The purpose of this paper is to describe a new species of Stilobezzia (Acanthohelea) recently collected in the Nothofagus forest of the Nahuel Huapi National Park. Rev. Soc. Entomol. Argent. 71 (3-4): 187-190, 2012188mATERIAL AND mETHODSSpecimens were collected with Malaise traps, preserved in 70º ethanol and subsequently slide mounted in Canada balsam, then examined, measured and drawn with a binocular compound microscope with an attached camera lucida. Terminology follows the Manual of Central American Diptera (Brown et al., 2009). Photomicrographs were taken with a digital camera Micrometrics SE Premiun, through Nikon Eclipse E200 microscope. Types of the new species are deposited in the collection of the División Entomología, Museo de La Plata, Argentina (MLP). RESULTSStilobezzia (Acanthohelea) longisternalis Cazorla & Spinelli sp. nov(Figs. 1-9)Diagnosis. Only species of Stilobezzia (Acanthohelea) from Patagonia with the male sternite 9 bearing an elongate and narrow posteromedian projection. Females with 14 strong and 13 thinner scutellar setae and abdominal segment 8 heavily sclerotized.Description. Male adult. Head (Fig. 1) dark brown. Antennal flagellomeres brown; plume dark brown, dense; antennal ratio 0.98-1.18 (1.08, n= 8). Palpus dark brown; third segment cylindrical with subapical sensory pit; fifth segment as long as third; palpal ratio 3.71-4.29 (4.18, n= 8). Thorax: scutum yellowish brown except anterior, posterior margins, sublateral anterior areas dark brown; scutellum yellowish with 17-18 stout setae, 12 thinner ones; pleura yellowish brown; postscutellum dark brown. Legs yellowish brown, hairy; hind coxa brown; first tarsomere of hind leg with basal stout spine; prothoracic TR 1.72-2.00 (1.88, n= 8); mesothoracic TR 1.94-2.11 (2.00, n= 7); metathoracic TR 1.67-1.81 (1.73, n= 8). Wing (Fig. 2) length 2.58-2.83 (2.70, n= 8) mm; width 0.80-0.88 (0.83, n= 8) mm; membrane slightly infuscated; second radial cell 3.50-4.62 (3.81, n= 8) times longer than first; cubital fork at level of beginning of r-m crossvein; macrotrichia on costa, R1, R2, R3, distal ¼ of m1, sparce on r3. Halter pale. Abdomen dark brown. Genitalia (Figs. 3-5): dark brown; tergite 9 not produced beyond apex of gonocoxite, lateral margins of proximal 1/2 straight, slightly divergent, lateral margins of distal 1/2 convergent, posterior margin rounded; sternite 9 with conspicuous, elongate, narrow posteromedian projection extending to gonocoxite midlength; sternite 10 slightly visible, spiculate, produced beyond base of cerci; cercus slender, divergent. Gonocoxite stout, 1.72 times longer than greatest breadth, inner margin with pointed protuberance at distal 1/3. Gonostylus yellowish brown distally, slightly shorter than gonocoxite, almost straight, tip blunt. Parameres separated, subparallel, short; each with basal apodeme at level of gonocoxite midlength; proximal portion slender, distal portion broader, rounded. Aedeagus represented by 2 stout, slightly sinuose, convergent sclerites, each with basal tip curved laterad, distal tip curved, pointed.Female adult.  As for male, with following differences. Head (Fig. 6) brown. Antennal flagellomeres dark brown; antennal ratio 1.42. Palpus dark brown; palpal ratio 3.87. Mandible with 7 teeth. Thorax (Fig. 8): scutellum with 14 stout setae, 13 thinner ones; hind tibial comb with 9 spines; claws shorter than fifth tarsomere; prothoracic TR 2.06; mesothoracic TR1.89; metathoracic TR 1.75. Wing (Fig. 7) length 2.76 mm; width 0.98 mm; membrane slightly infuscated; second radial cell 4.30 times longer than first; cubital fork slightly anterior to level of beginning of r-m crossvein; macrotrichia on costa, R1, R2, R3, M1, M2, abundant on r3, sparce on m1. Abdomen brown, segment 8 heavily sclerotized. Genitalia (Fig. 9): anterior margin of sternite 8 slightly concave, posteromedian excavation V-shaped; sternite 10 elongate, with 7-8 pairs of setae; cercus short; two ovoid spermathecae, measuring 14 µ by 7.4 µ and 10.3 by 8.5 µ; necks minute, almost indistinguishable.Types.  Holotype male, allotype female: Argentina, Río Negro prov., Nahuel Huapi CAZORLA, C. G. and G. R. SPINELLI. Una nueva especie de Stilobezzia de Argentina 189Figs.  1-9. Stilobezzia (Acanthohelea) longisternalis Cazorla & Spinelli, n. sp.  1-5, male; 6-9, female; 1, 6, head; 2, 7, wing; 3, genitalia; 4, genitalia (parameres removed); 5, parameres; 8, thorax; 9, abdominal segments 8-10. (Scale bars = 0.05 mm).Rev. Soc. Entomol. Argent. 71 (3-4): 187-190, 2012190National Park, Aº Ñireco (Complejo Challhuaco), 41º 11’ 51.9’’S 71º 19’ 40’’W, 962 m, 20-XII-2006/ 23-I-2007, Masaferro, Garre & Montes de Oca, Malaise trap (MLP). Other paratypes, 11 males, as follows: same data as holotype, 8 males (MLP); Argentina, Río Negro prov., Nahuel Huapi National Park, Mallín de los Patos, 41º 15’ 48.6’’S 71º 17’ 50.3’’ W, 1020 m; XII-2006/ 23-I-2007, Garre & Montes de Oca, 3 males, Malaise trap (MLP).Distribution. Argentina (Río Negro province). Derivation of specific epithet. A reference to the particular elongate posteromedian projection of the male sternite 9.DISCUSSIONStilobezzia (Acanthohelea) longisternalis can be easily recognized by the conspicuous and narrow posteromedian projection of the male sternite 9. Another patagonian species, S. (A.) hirsuta Ingram & Macfie, also has the male sternite 9 bearing a posteromedian projection, but in this case the projection is shorter, broader and hyaline. Moreover, S. (A.) hirsuta lacks a basal spine in the first tarsomere of the hind leg, and the posterior margin of the male tergite 9 is bilobed.ACKNOWLEDGEmENTSThis study was supported by the Darwin Initiative project “Capacity building for biodiversity studies of freshwater insects in Argentina”.LITERATURED CITED1. BROWN, B. V., A. BORKENT, J. M. CUMMING, D. M. WOOD, N. E. WOODLEy & M. A. ZUMBADO. 2009. Manual of Central American Diptera: Volume 1. NRC Research Press, Ottawa, Ontario, Canada. 2. CAZORLA, C. G., F. DíAZ & M. M. RONDEROS. 2006. Redescription of pupa and adult of Stilobezzia fiebrigi Kieffer 1917 (Diptera: Ceratopogonidae). T. Am. Entomol. Soc. 132 (1+2): 111-119.3. CAZORLA, C. G. & G. R. SPINELLI. 2012. A revision of the Neotropical predaceous midges allied to Stilobezzia (Acanthohelea) edwardsi Ingram & Macfie (Diptera: Ceratopogonidae) with a phylogenetic analysis. Insect Syst. & Evol. 43: 67-97.4. DE MEILLON, B. & W. W. WIRTH. 1991. The genera and subgenera (excluding Culicoides) of the Afrotropical biting midges (Diptera: Cerratopogonidae). Ann. of the Natal Mus. 32: 27-147.5. INGRAM, A. & J. W. S. MACFIE. 1931. Ceratopogonidae. En: Diptera of Patagonia and South Chile. Part II. Fasc. 4: 155-232.6. WIRTH, W. W & W. L. GROGAN. 1988. The predaceous midges of the World (Diptera: Ceratopogonidae: Tribe Ceratopogonini). Flora and Fauna Handbook 4. E.J. Brill, Leiden.

Una nueva especie del género Stilobezzia del Parque Nacional Nahuel Huapi, Argentina (Diptera: Ceratopogonidae)

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A new species, Stilobezzia (Acanthohelea) longisternalis, collected in the Nothofagus forest of the Nahuel Huapi National Park (Argentina) is described, photographed and illustrated based on the examination of male and female adults. The new species can be easily recognized by the elongate and narrow posteromedian projection of the male sternite 9; it is compared with S. (A.) hirsuta Ingram &amp; Macfie.Una nueva especie, Stilobezzia (Acanthohelea) longisternalis, colectada en los bosques de Nothofagus del Parque Nacional Nahuel Huapi (Argentina), se describe, fotografía e ilustra en base al estudio de machos y hembras adultos. La nueva especie se reconoce fácilmente por presentar una proyección posteromediana alargada y delgada en el esternito 9 de los machos. Se compara con S. (A.) hirsuta Ingram &amp; Macfie.Facultad de Ciencias Naturales y Muse

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Una nueva especie del género Stilobezzia del Parque Nacional Nahuel Huapi, Argentina (Diptera: Ceratopogonidae)

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