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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060 EISSN: 1678-8060
Vol. 89, Num. 1, 1994, pp. 25-27

Mem Inst Oswaldo Cruz, Rio de Janeiro, Vol. 89(1): 25-27, jan./mar. 1994

Culicoides lobatoi, a New Brazilian Biting Midge of the Limai Group (Diptera: Ceratopogonidae)

Maria Luiza Felippe-Bauer, Adlia R Quintelas

Departamento de Entomologia, Instituto Oswaldo Cruz, Av. Brasil 4365, 21045-900 Rio de Janeiro, RJ, Brasil

Code Number: OC94005
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A new Brazilian species of the Culicoides limai group, C. lobatoi from Nova Friburgo, State of Rio de Janeiro, is described and illustrated from female specimens.

Studies of material from light trap collection made by Felippe-Bauer in Nova Friburgo, Rio de Janeiro, Brazil, revealed a new species described here based on female specimens.

In our study we used the terminology employed in the comprehensive revisions on Culicoides, by Wirth and Blanton for Panama (1959), the Amazon Basin (1973), and the West Indies (1974), and the Atlas of wing photographs of Neotropical species, by Wirth et al. (1988).

Key words: Neotropical bloodsucking midge Culicoides limai group Culicoides lobatoi sp. n.

Culicoides lobatoi Felippe-Bauer, new species (Figs 2-10)

Fig. 1: Culiciodes lobatoi sp. n.,female. wing photography

Female: wing length 1.03 (0.95-1.08, n = 8) mm; breadth 0.52 (0.46-0.54, n = 8) mm.

Head: dark brown. Eyes (Fig. 3) slightly separated by a distance of 1/3 ommatidial facet, bare. Antenna (Figs 2, 5) brown except on the first 2/3 of the segments 4-7, which are paler; lengths of flagellar segments in proportion of 16-14-16-17-16-16-16-17-16-16-18-18-31; antennal ratio 0.77 (0.74-0.78, n = 7); sensilla coeloconica present on segments 3, 8-10, double on 3, triple on 9-10, and double or as often triple on 8. Palpus (Fig. 6) brown; lengths of segments in proportion of 8-18-22-7-9; third segment swollen distally, with a large, deep, round sensory pit; palpal ratio 2.2 (1.9-2.3, n = 9). Proboscis dark brown, moderately long, P/H ratio 0.76 (0.71-0.83, n = 9); mandible (Fig. 4) with 14 (n = 6) rarely with 13 (n = 1) or 15 (n = 2) teeth.

Thorax: brown; scutum (Fig. 9) with prominent pattern, including a submedian anterior pair of elongated pale spots and two pairs of lateral pale spots, a prescutellar brown area and a median area with sublateral pair of dark brown bands; scutellum broadly brown in middle, pale on sides; postscutellum pale. Legs (Fig. 10) dark brown, knee spots blackish; fore- and midfemora with subapical and all tibiae with subbasal pale spots; hind tibia with 1/3 apical pale; first tarsomere of the hind leg brown and the further paler; hind tibial comb (Fig. 7) with four spines, the two nearest the spur longest, subequal. Wing (Fig. 1) with pattern as figured; cell R5 with three pale spots, the poststigmatic area and in the middle of cell one large and broadly reaching wing margin, the one narrow and faint pale line in the distal tip of the cell; cell M1 with two pale areas, the proximal large an oval, the distal one broadly reaching wing margin and connected with the distal pale line of the cell R5; cell M2 with area between medial and mediocubital forks continuously pale connected with the first distal pale spot of cell, the second distal pale spot larger than first and meeting wing margin; cell M4 with a broad rounded pale spot extending from vein M3+4 to wing margin; vein M1 with a faint pale streak; anal cell with one large and strangulated pale spot in distal portion, extending from vein Cu^2 to margin of the cell; base of the wing with a pale spot extending broadly from costal vein to margin of anal cell; macrotrichia moderately dense on distal half of the wing, including anal cell; costal ratio 0.58 (0.54-0.59, n = 8); halter pale.

Abdomen: dark brown. Spermathecae (Fig. 8) two plus rudimentary 3rd and sclerotized ring; ovoid with long well sclerotized necks, slightly unequal, measuring 0.038 by 0.048 mm and 0.033 by 0.043 mm, plus necks 0.011 mm long (n = 9); sclerotized ring with length 0.010mm (n = 9).

Figs.2-10 Culicoides lobatoi sp.n.,female. Fig. 2: antenna. Fig. 3: eye separation. Fig. 4: mandible. Fig. 5: antennal segments 8-10. Fig. 6: palpus. Fig. 7: hind tibial comb. Fig. 8: spermathecae. Fig. 9: mesonotum. Fig. 10: legs (left to right) hind, mid and fore.

Male: unknown.

[f-female, m-male] Distribution: Brazil (Rio de Janeiro).

Types: Holotype: f (no. 209) Furnas do Catete, Nova Friburgo (42 o 33'W, 22 o 18'S), Rio de Janeiro, BRAZIL, X-XI.1987, Felippe-Bauer col., deposited in Instituto Oswaldo Cruz, Rio de Janeiro, Brazil. Paratypes: 4 ff (no. 210-213), same data as holotype but 4-13.X.1987, 4.XII.1987-11.I.1988, 11.III-14.IV.1988; 1 f (no. 214) Pau da Fome, Jacarepagu (43o 20'W, 22o 58'S) Rio de Janeiro, Rio de Janeiro, BRAZIL, VII.1974, Tavares col., deposited in Instituto Oswaldo Cruz, Rio de Janeiro, Brazil; 1 f, same data as holotype but 6.XI-3.XII.1987, deposited in National Museum of Natural History, Smithsonian Institution, Washington, D.C., USA; 2 ff same data as holotype but 4-13.X.1987, one deposited in Museo de La Plata, Argentina and the other in Dept de Epidemiologia, Faculdade de Sade Pblica, Universidade de So Paulo, So Paulo, Brazil.

Etymology: this species is named in honor of Dr Wladimir Lobato Paraense, in recognition of his important contributions to the study of the Brazilian planorbid molluscs during the past 40 years.

Discussion: this species most closely resembles C. limai Barreto, C. antunesi Forattini and C. boliviensis Spinelli & Wirth by general aspects of the wings. C. lobatoi, antunesi and boliviensis have similar pale markings on all legs while C. limai presents an additional pale spot on subapical portion of hind femur. C. lobatoi presents P/H ratio greater than in limai, antunesi, and boliviensis, while these three species have sensilla pattern 3,7-10 and antennal ratio greater than 1, C. lobatoi shows values of 3,8-10 and 0.77 respectively.

ACKNOWLEDGEMENTS

To Instituto Brasileiro de Defesa Florestal for permitting us to collect the entomological material in Furnas do Catete, and to Drs W Rudin and R Brun, Swiss Tropical Institute, Basel, for assistance in the wing photographs.

REFERENCES

Wirth WW, Blanton FS 1959. Biting midges of the genus Culicoides from Panama (Diptera: Heleidae) Proc US Nat Mus 109: 237-482.

Wirth WW, Blanton FS 1973. A review of the maruins or biting midges of genus Culicoides (Diptera: Ceratopogonidae) in the Amazon Basin. Amazoniana 4: 405-470.

Wirth WW, Blanton FS 1974. The West Indian sandflies of the genus Culicoides (Diptera: Ceratopogonidae). US Dept Ag Tech Bull 1474: 1-98.

Wirth WW, Dyce AL, Spinelli GR 1988. An atlas of wing photographs, with a sumary of the numerical characters of the Neotropical species of Culicoides (Diptera: Ceratopogonidae). Contrib Am Ent Inst 25: 1-72.

Copyright 1994 Memorias do Instituto Oswaldo Cruz


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