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Revista de la Sociedad Entomológica Argentina

versión impresa ISSN 0373-5680versión On-line ISSN 1851-7471

Rev. Soc. Entomol. Argent. v.66 n.3-4 Mendoza ago./dic. 2007

 

Description of the male of Culicoides dureti (Diptera: Ceratopogonidae)

Descripción del macho de Culicoides dureti (Diptera: Ceratopogonidae)

Spinelli, Gustavo R. and María M. Ronderos

División Entomología, Museo de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina; e-mail: spinelli@fcnym.unlp.edu.ar; ronderos@fcnym.unlp.edu.ar

RESUMEN. Se describe e ilustra el macho de Culicoides dureti Ronderos & Spinelli y se brinda una breve descripción de la hembra sobre la base de ejemplares capturados, asociados con hembras en la Provincia de Misiones, Argentina. La especie es comparada con Culicoides barbosai Wirth & Blanton.

PALABRAS CLAVE. Culicoides dureti; Macho; Argentina.

ABSTRACT. The male of Culicoides dureti Ronderos & Spinelli is described and illustrated from specimens collected associated with females in the province of Misiones, Argentina, and a brief description of the female is provided. The species is compared with Culicoides barbosai Wirth & Blanton.

KEY WORDS. Culicoides dureti; Male; Argentina.

INTRODUCTION

Biting midges of the genus Culicoides Latreille are notorious blood-sucking pest of man and animals throughout the world (Wirth et al., 1988). Culicoides dureti Ronderos & Spinelli is presently known by only female specimens from the area influenced by the hydroelectric complex «Yacyreta», located in the Paraná river, between Argentina and Paraguay (Ronderos & Spinelli, 1995).
The recent discovery of males associated with females of C. dureti in the city of Posadas, Misiones, prompted us to herein describe and illustrate the male of this species, providing a brief description of the female, as well.
Terms for structures follow those used in the Manual of Nearctic Diptera (McAlpine et al., 1981) and in Spinelli & Borkent (2004). Terms for wing veins follow the modifications proposed by Szadziewski (1996). The specimens examined are slide mounted in Canada balsam, and deposited in the collection of the Museo de La Plata, Argentina (MLP). Photos of structures were taken with a Pentax Optio, S 40, digital camera through a Leitz S-M Lutz, compound research microscope.

RESULTS

Culicoides dureti Ronderos & Spinelli, 1995 (Figs. 1-6)


Figs. 1-4. Culicoides dureti. 1, wing of female; 2-5, male. 2, head; 3, flagellomeres 2-13; 4, wing


Figs. 5-6. Culicoides dureti, male. 5, genitalia (parameres removed); 6, parameres. Scale bar: 0.05 mm

Culicoides dureti Ronderos & Spinelli, 1995: 59 (female; Paraguay, Argentina); Borkent & Wirth, 1997: 67 (in Word catalog); Borkent & Spinelli, 2000: 32 (in neotropical catalog); Ronderos & Spinelli, 2002: 93 (in key); Spinelli et al., 2005: 141, 146 (in key; wing photo).

Brief redescription of the female. Eyes: bare, narrowly separated; AR 0.77-0.88; sensilla coeloconica on flagellomeres 1, 5- 8; flagellomeres 8-9 subequal, third palpal segment stout with shallow, rounded, subapical pit; mandible with 17-18 teeth; P/ H ratio 0.81-0.91. Scutum: dark brown, without definite pattern, only scattered punctiform darker dots at insertions of setae. Legs: dark brown, knees: blackish, femora with subapical, tibia with subbasal and hind tibia with subapical, narrow rings; hind tibial comb with 4 spines. Wing pattern as in Fig. 1; wing length 0.78-0.90; macrotrichia sparse on the distal half of wing, a few in anal cell; CR 0.57-0.60; halter dark brown, tip of know whitish dorsally. Two ovoid spermathecae with short necks; rudimentary third, sclerotized ring present.

Description of male. Similar to female with usual sexual differences.
Head (Fig. 2): dark brown. Eyes: bare, forming a V shaped where they contact. Antennae with flagellomeres 2-10 fused (Fig. 3); flagellomeres 1-10 pale, 11-13 brown; sensilla coeloconica in flagellomeres 1, 6-10. Third palpal segment stout, with broad shallow, rounded subapical sensory pit. Wing length: 0.82 (0.78-0.87, n = 6) mm, width 0.38 (0.36-0.39, n = 6) mm; pattern as in Fig. 4; CR 0.53 (n = 6).
Genitalia (Figs. 5-6): tergite 9 long, with very short apicolateral processes, small posteromedial notch, pair of evident, pilose, median cerci; sternite 9 with rounded, narrow posteromedial excavation. Gonocoxite: stout, 2.5 times as long as greatest breadth, ventral root foot-shaped, posterior heel evident, dorsal root slender; gonostylus as long as gonocoxite, slender, with bent pointed tip lightly. Parameres (Fig. 6) separate, stout, each with strongly sclerotized basal knob; stem curved near base, midportion of stem nearly straight, distal portion slender, bent ventromesad, taperering to fine point with lateral fringe of stout spines. Aedeagus Yshaped; basal arch extending to 0.75 of total length; basal arms slender, strongly sclerotized, slightly curved; posteromedial projection lightly sclerotized tapered to slender, rounded tip, with pair of lateral pointed processes.

Distribution. Southeastern Paraguay, northeastern Argentina.

Type. Holotype female, Paraguay, Encarnación, Quitería, 22-XI-1993, G.R. Spinelli, CDC light (MLP).

Other specimens examined. Argentina, Misiones, Posadas, XII-2006, M. D'Oria, 6 females, 6 males, CDC light trap.

Taxonomic Discussion. Culicoides dureti is very similar to C. barbosai Wirth & Blanton, from USA (Florida) to Ecuador. However, the latter has a prominent pattern of punctiform darker dots on the scutum, the apicolateral processes of the male sternite 9 are larger, the posterior midportion of the parameres stem bears a distinct ventral lobe, and the basal arch of the aedeagus is slightly lower.

ACKNOWLEDGEMENTS

We would like to express our gratitude to Nélida Caligaris for technical assistance, and to Martín D'Oria, who collected the material herein described.

LITERATURE CITED

1. BORKENT, A. & G. R. SPINELLI. 2000. Catalog of the New World biting midges south of the United States of America (Diptera: Ceratopogonidae). Contrib. Entomol. Internat. 4: 1-107.
2. BORKENT, A. & W. W. WIRTH. 1997. World species of biting midges (Diptera: Ceratopogonidae). Bull. Amer. Mus. Nat. History 233: 1-257.
3. McALPINE, J. F., B. V. PETERSON, G. E. SHEWELL, H. J. TESKEY, J. R. VOCKEROTH & D. M. WOOD (coords.). 1981. Manual of Nearctic Diptera. Volume 1. Agriculture Canada Monograph 27: 1-674.
4. RONDEROS, M. M. & G. R. SPINELLI. 1995. Two new Neotropical species of Culicoides from the Parana river basin of Argentina and Paraguay (Diptera: Ceratopogonidae). Trans. Amer. Entomol. Soc. 121: 59-63.
5. RONDEROS, M. M & G. R. SPINELLI. 2002. Los Culicoides de la Argentina: clave de especies y nuevos registros (Diptera: Ceratopogonidae). In: O.D. Salomón (comp.). Actualizaciones en Artropodología Sanitaria Argentina. Fundación Mundo Sano, Buenos Aires, pp. 89-95.
6. SPINELLI, G. R. & A. BORKENT. 2004. New species of Central American Culicoides Latreille (Diptera: Ceratopogonidae) with a synopsis of species from Costa Rica. Proc. Entomol. Soc. Wash. 106: 361-395.
7. SPINELLI, G. R., M. M RONDEROS, F. DÍAZ & P. I. MARINO. 2005. The bloodsucking biting midges of Argentina (Diptera: Ceratopogonidae). Mem. Inst. Oswaldo Cruz 100: 137-150.
8. SZADZIEWSKI, R. 1996. Biting midges from Lower Cretaceous amber of Lebanon and Upper Cretaceous Siberian amber of Taimyr (Diptera, Ceratopogonidae). Studia Dipterol. 3: 23-86.
9. WIRTH, W. W, A. L. DYCE & G. R. SPINELLI. 1988. An atlas of wings photographs, with a summary of the numerical characters of the Neotropical species of Culicoides (Diptera: Ceratopogonidae). Contrib. Am. Entomol. Inst. 25: 1-72.         [ Links ]         [ Links ]         [ Links ]         [ Links ]         [ Links ]         [ Links ]         [ Links ]         [ Links ]         [ Links ]

Recibido: 31-05-2007;
aceptado: 3-07-2007

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