Antillocladius simplex, Andersen & Hagenlund, 2017

Andersen, Trond & Hagenlund, Linn Katrine, 2017, Two new species of Antillocladius Saether, 1981 from the Amazon rainforest, Brazil (Diptera, Chironomidae, Orthocladiinae), Norwegian Journal of Entomology 64, pp. 65-71 : 68-70

Antillocladius simplex sp. n. ( Figures 2 , 6–9 )

Type material: Holotype: ♂, BRAZIL, Amazonas State, Manaus, Reserva Adolpho Ducke , 1 km after entrance, 4–8.II.2010, Malaise trap, leg. L.C. Pinho & H.F. Mendes ( MZUSP).

Paratypes: 9 ♂♂ as holotype ( MZUSP, ZMBN) .

Etymology: From Latin simplex meaning simplicity, referring to the shape of the inferior volsella.

Diagnostic characters: The new species can be separated from its congeners by having a tapering, pointed anal point with strong posteriorly directed marginal setae; a simple, apically bluntly triangular to subrectangular inferior volsella; and wing without apical setae.

Description: Male (n = 7–9). Total length 1.89–2.14, 2.02 mm. Wing length 0.98–1.12, 1.06 mm. Total length / wing length 1.71–2.07, 1.91. Wing length / length of profemur 2.45–2.59, 2.50.

Coloration. Thorax dark brown, head and abdomen brown, legs lighter brown.

Antenna. Antennal ratio (AR) = 1.00–1.13, 1.06. Ultimate flagellomere 332–384, 358 μm long.

Head. Temporal setae 6–10, 8 including 2–4, 3 inner verticals, 2–4, 3 outer verticals and 0–2, 1 postorbitals. Clypeus with 3–6, 5 setae. Tentorium 110–119, 115 μm long, 18–21, 19 μm wide. Stipes 90–104, 95 μm long, 11–15, 13 μm wide. Palp segment lengths (in μm): 19–23, 21; 35–41, 37; 75–91, 81; 73–88, 80; 97–116, 105. Third palpomere with 2–3, 3 sensilla clavata subapically, longest 12–14, 13 μm long.

Thorax ( Figure 6 ). Antepronotum with 1–3, 2 setae. Dorsocentrals 6–10, 8; acrostichals 9–15, 11, scalpellate in mid scutum; prealars 3; supraalar 1. Scutellum with 4–7, 6 setae, uniserial.

Wing ( Figure 2 ). Venarum ratio (VR) = 1.39– 1.51, 1.45. Costal extension 44–51, 46 μm long. Brachiolum with 1 seta, remaining cells and veins bare. Squama with 3–5, 4 setae.

Legs. Spur of fore tibia 36–43, 39 μm long, spurs of mid tibia 22–30, 26 μm and 18–25, 21 μm long, spurs of hind tibia 39–47, 42 μm and 18–22, 20 μm long. Width at apex of fore tibia 25–28, 27 μm, of mid tibia 26–29, 27 μm, of hind tibia 32–35, 33 μm. Comb with 11–12, 11 setae, longest 25–33, 29 μm, shortest 18–22, 20 μm long. Lengths and proportions of legs as in Table 2.

Hypopygium ( Figures 7–9 ). Tergite IX covered with coarse microtrichia; laterosternite IX with 5–7, 6 setae. Anal point tapering, pointed, 44–54, 48 μm long, 30–46, 35 μm wide at base, with 10– 16, 14 strong, marginal setae. Phallapodeme 77– 91, 84 μm long; transverse sternapodeme curved, 81–101, 90 μm long. Virga composed of 2 short, blunt spines, longest 4–10, 6 μm long. Gonocoxite 131–159, 144 μm long. Inferior volsella bluntly triangular to subrectangular apically, 18–23, 21 μm wide, ending 48–52, 50 μm from apex of gonocoxite. Gonostylus curved in apical onethird, 66–76, 69 μm long; megaseta 11–14, 13 μm long. Hypopygium ratio (HR) = 1.90–2.29, 2.06. Hypopygium value (HV) = 2.79–3.06, 2.90.

Biology and distribution: See previous species ( Antillocladius bulbosus sp. n.).

Figures

FIGURE 6. Antillocladius simplex sp. n., male, dorsal part of thorax, lateral view.

FIGURES 7–9. Antillocladius simplex sp. n., male. 7. Hypopygium, dorsal view. 8. Hypopygium with anal point and tergite IX removed, dorsal aspect to the left and ventral aspect to the right. 9. Gonostylus, lateral view.

FIGURES 1–2. Antillocladius spp. wings. 1. A. bulbosus sp. n. 2. A. simplex sp. n.