Atrichopogon cavus Felippe-Bauer

Felippe-Bauer, Maria Luiza, Silva, Tiago Do Nascimento Da & Alves, João Ricardo Carreira, 2012, Two new species of Atrichopogon Kieffer from Rio de Janeiro, Brazil (Diptera: Ceratopogonidae), Zootaxa 3566, pp. 39-50 : 45-50

Atrichopogon cavus Felippe-Bauer , sp.nov.

Figs. 15–28 .

Diagnosis. Male and female: only extant species of Atrichopogon with pigmented wings in Neotropical region with two ovoid pale spots on the dark band present in distal 1/3 of the wing.

Male: Head: Pale brown. Head width/mouthpart length 2.0–2.5 (2.3, n=5). Ommatidia with interfacet pubescence; broadly abutting medially for length of 3.3–3.8 (n=4) ommatidia ( Fig. 18 ). Antenna yellowish brown, darker on segments 10–13; proportions of flagellomeres as in figure 17; flagellomeres 2–10 fused; plume on flagellomeres 1–10 well developed; flagellomeres 11–13 without plume setae; flagellomere 9 = 0.6–0.7 (n=5) x shorter than flagellomere 10; flagellomere 13 with apical projection not basally constricted; AR 1.02–1.11 (1.06, n=4). Palpus ( Fig. 19 ) pale brown; third segment short, swollen at midlength, with moderately deep pit on midlength; segment 4, 5 separate; segment 5 conical; PR 1.7–2.7 (2.1, n=3).

Thorax ( Fig. 23 ): Dark brown. Scutum with setae arising directly from surface; with lateral suture. Paratergite with one seta. Wing ( Fig. 15 ) with two transverse darker bands, one straddling r-m, other covering distal 1/3 of wing, latter with two ovoid pale spots, one on r3, other on m1 and m2; without macrothichiae on membrane or with macrothichiae in apical portion of r3 and m1 some specimens; wing length 1.02–1.12 (1.07, n=6) mm; CR 0.68–0.70 (0.69, n=6). Halter pale. Legs ( Fig. 22 ) yellowish brown, apical portion of coxae, trochanters, basal portion of femora lighter; hind tibial spur longer than width of hind tibia; empodia present.

Abdomen brown ( Fig. 21 ): segments 1–6 with ventrolateral black marks. Terminalia pale brown ( Fig. 20 , 24 ): segment 9 equal in width to segment 8; tergite 9 extending to about level of apex of gonocoxite; posterior margin rounded. Sternite 9 with posterior margin broadly concave, with scattered transverse row of 8–9 setae. Gonocoxite 2.5–2.6 (n=6) times as long as basal width, without medial lobe, gonocoxal apodeme anteriorly directed. Gonostylus tapering, curved bearing pointed apex. Aedeagal-parameral complex composed only of ventral portion, nearly rectangular, with a posteromedial projection connected with basal arch, forming T-shaped structure; lateral arms directed anterolaterally. Cercus short, lobe-like, ventral to tergite 9.

Female. Similar to male, with following differences. Head: Head width/mouthpart length 1.7–1.9 (1.8, n=3); eyes broadly abutting medially for length of 3.8–4.0 (n=4) ommatidia. Antenna ( Fig. 25 ) pale brown, flagellomeres 1–8 vasiform, AR 1.57–1.79 (1.68, n=4). Mandible well developed with 15 teeth. Palpus ( Fig. 26 ) pale brown, moderately elongate, pit at midlength, segments 4, 5 separate or partially fused PR 1.7–2.2 (2.0, n=3). Wing ( Fig. 16 ) pattern of pigmented membrane as for male; macrotrichia on membrane in apical portion of r3, m1, apical ½ of M1 and M2; wing length 1.10–1.15 (1.10, n=4) mm. CR 0.68–0.72 (0.70, n=4). Legs as in figure 28. Abdomen ( Fig. 27 ) brown; cercus pale brown. Genitalia: one dark brown ovoid spermatheca, with short neck (long in one specimen: 20 µm), measuring 75–90 (81, n= 4) x 55 –65 (62, n=4) μm.

Types. Holotype male, on microscope slide labeled “Sumidouro, Rio de Janeiro, BRASIL, 25–26.XI.2009, CDC light trap, “forest area”, São Caetano’s Rock” (CCER). Allotype female, same data as holotype except “forest area near São Caetano’s Rock” (CCER). Paratypes 6 males, 3 females as follows: 1 male same data as holotype (CCER); 2 males, 1 female same data as allotype (CCER); 2 males, 1 female same data as holotype except “São Caetano’s Rock cave” (CCER); 1 male, 1 female same data as holotype except 15–16.XII.2009 (MLP).

Etymology. The specific name is based on the habitat, where the new species was collected.

Taxonomic discussion. The new species is similar to A. maculipennis on the basis of its distinct pattern of pigmentation of the wing as two transverse darker bands, one straddling r-m to CuA2 and other covering the distal 1/3 of the wing. It can be distinguished from A. maculipennis by the presence of the two ovoid pale spots on the dark distal band of the wing, one on r3 and other occupying the distal portion of m1 and m2.

Bionomics. The two new species described here were collected in the cave, near the cave and in the forest area at 30 meters distant of the São Caetano’s Rock in the municipality of Sumidouro, Rio de Janeiro, Brazil. The collections were performed with good time without rain and wind, with the moon in the first-quarter. During the dates of the work field, the species were collected simultaneously in the three sites of capture, regardless the wetter condition.

Figures

FIGURE 24. Terminalia of Atrichopogon cavus sp. nov., ventral view, aedeagal-parameral complex removed. Aedeagalparameral complex in dissected view. Scale bar: 0.1 mm.

FIGURES 15 – 16. Wing photographs of Atrichopogon cavus sp. nov. 15. male; 16. female.

FIGURES 17 – 23. Atrichopogon cavus sp. nov., male. 17. Antenna; 18. Dorsal portion of head capsule, anterior view; 19. Palpus, lateral view; 20. Terminalia; 21. Abdomen, ventral view; 22. Legs (left to right) of hind, mid- and forelegs, lateral view; 23. Scutum, dorsal view.

FIGURE 25 – 28. Atrichopogon cavus sp. nov., female. 25. Head, anterior view; 26. Palpus, lateral view; 27. Abdomen, ventral view; 28. Legs (left to right) of hind, mid- and forelegs, lateral view.