Antillocladius laviejae, Ospina-Torres & Mey & Jaime-Murcia, 2018

Ospina-Torres, Rodulfo, Mey, Wolfram & Jaime-Murcia, Patricia, 2018, Two new orthoclad species from Colombian Andes (Diptera: Chironomidae), Zootaxa 4472 (2), pp. 385-392 : 389-391

Antillocladius laviejae sp. n.

( Figs 7–12 )

Material examined. Holotype: male: COLOMBIA, Bogota D.C., Quebrada la Vieja , 2666 m a.s.l., 04°38'59.12''N 74°02'53.75''W, 6.2.2017, light trap, “morfo 18”, leg. R.Ospina ( ICN-MHN) . Paratypes: 2 males, as holotype ( ICN- MHN, ZSM). Aditional specimens: COLOMBIA, Risaralda . Parque Nacional los Nevados, Rio Otun , 3600 m a.s.l., 27.4.2017, hand net, swarm over standing water. “morfo 11A”. 6 males.( ICN-MHN).

Diagnostic characters. Males of A. laviejae sp. n. can be separated from A. venequatoriensis and other members of the genus by following combination of characters: Cells m1+2, m3+4 and an, with the wing membrane nearly completely covered by setae; AR <0.9; Total length ≥ 2.8 mm. and the somewhat more developed inferior volsella.

Description. Male (n=3).

Dimensions. Total length 2.85–3.13, 3.00 mm. Wing length 1.82–1.95, 1.90 mm. Total length/wing length 1.55–1.60, 1.57. Wing length/length of profemur 2.26–2.34, 2.3.

Coloration. Thorax light brown with darker vittae on the sides of scutum. Postnotum and preepisternum dark brown. Abdominal segments I–V brown, VI–IX dark brown. Legs light brown.

Antenna. AR: 0.87 (1). Last flagellomere 410 (1) µm long, rounded at apex.

Head. ( Figure 7 ) Total temporal setae 7–10, 9. Inner verticals 1. Outer verticals 4–5, 5. Postorbitals 2–4, 3. Clypeus, with 11–13, 12 setae. Tentorium, stipes and cibarial pump as in Figure 9 . Tentorium 150–167.5, 155.8 µm long, 30–35, 32 µm wide. Stipes 130–150, 142 µm long, 27.5–35, 30 µm wide. Palp segments lengths (in µm, n=2): 30; 50; 140–150, 145; 110; 140–150, 145.

Thorax. ( Figure 8 )Anteropronotum with 2 lateral setae. Acrostichals: 8, scalpelate. Dorsocentrals: 11–13, 12 setae, parti ally biserial. Prealars: 4 setae. Supraalars: 1. Scutellum with 10–12 setae.

Wings. ( Figure 10 ) Anal lobe well developed. VR 1.35–1.47, 1.42. Costal extension 70–90, 86.6 µm. long. Brachiolum with 1 setae. R with 23–29, 26 setae. R1 with 21–22, 21 setae, R4+5 wit 34–46, 39 setae, Costal extension with 20–21, 21, of these 9–12, 11 non marginal setae. Wing membrane with 370–397, 382 setae in cell r4+5; 169–245, 217 in cell m1+2; 120–140, 128 in cell m3+4. Squama with 7–8, 8 setae.

Legs. Spur of fore tibia 52.5–55, 53.7 (n=2) µm. long. Spurs of mid tibia 37.5–40, 38.3 and 37.5 µm. long. Spurs of hind tibia (n=2) 60–65, 62.5 and 30–37.5, 33.7 µm. long. Width at apex of fore tibia: 40–42.5, 40.8 µm. Width of apex of mid tibia 32.5–35, 33.3 µm. Width at apex of hind tibia (n=2) 40–47.5, 43.7 µm. Comb with 9–10 setae, longest 40–50, 45, shortest 20–25, 22.5 µm. long. Lengths and proportions of legs in Table 2.

fe ti ta1 ta2

p1 800–860, 830 810–880, 850 740–760, 750 370–380, 376.6 p2 800–860, 840 760–870, 800 410–420, 413.3 220–230, 223.3 p3 960–960, 960 970–980, 975 620 320

Hypopygium. ( Figures 11–12 ) Tergite IX with 16–18, 17 setae, Laterosternit IX with 2–4, 3 setae. Anal point 90–100, 96.6 µm long. Anal point 25–27.5, 25.8 µm wide at base. Transverse sternapodeme widely curved, 70– 92.5, 85.8 µm long. Phalapodeme 70–77.5, 74.1 µm long. Virga 77.5–82.5, 80 µm long composed of two spines. Gonocoxite 182.5–185, 183.3 µm long, with 77.5–95, 84.1 µm long, 17.5 µm wide inferior volsella ending 62.5–70 µm from apex of gonocoxite. Gonostylus 105–110, 107.5 µm long, 22.5–25, 23.3 µm wide medially. Megaseta 7.5–10, 9.2 µm long. HR: 1.65–1.73, 1.7. HV: 2.66–2.88, 2.7.

Female and immatures. Unknown.

Remarks. Among the genera with scalpellate acrostichals setae, Antillocladius Saether has a well-developed anal point and mostly a setose squama. The species A. laviejae sp. n. share many characters with A. venequatoriensis , keys out to this species after Mendes et al. (2011) and apparently is part of the mostly neotropical lineage of the genus according to the biogeographical analysis of Mendes & Andersen (2008). Males of A. laviejae sp. n. can be separated from A. venequatoriensis and other members of the genus by the augmented pilosity on wing membrane, specially clearly seen on cells m1+2, m3+4 and an, where the wing membrane of the cells appears nearly completely covered by setae. Other differences are found in size (Total length: 3.0 vs 2.15 mm. Wing length:1.9 vs.1.36), the lower AR (0.87 vs 1.01) and the somewhat more developed inferior volsella ( Fig.11 ).

Figures

FIGURES 7–10. Antillocladius laviejae sp.n. 7. Head; 8. Thorax; 9. Tentorium, stipes and cibarial pump; 10. wing.

FIGURES 11–12. Antillocladius laviejae sp. n. 11. Hypopygium, doesal view; 12. Hypopygium without Tergit IX. Dorsal aspect left; ventral aspect right.