Antillocladius bulbosus, 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 : 65-68

Antillocladius bulbosus sp. n. ( Figures 1 , 3–5 )

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).

Andersen & Hagenlund: Two new species of Antillocladius from the Amazon rainforest

Paratypes: 2 ♂♂ as holotype ( MZUSP, ZMBN) .

Etymology: From Latin bulbus, meaning swelling, referring to the shape of the base of the anal point.

Diagnostic characters: The new species can be separated from its congeners by the distinct anal point with strong basal swelling and bare, nearly parallel-sided apical part, with strong anteriorly directed marginal and ventral setae; the inferior volsella has a long, nearly parallel-sided basal part and ovate, setose apical part; and the wing lacks apical setae.

Description: Male (n = 2–3). Total length 2.06–2.15 mm. Wing length 1.07–1.09 mm. Total length / wing length 1.91–1.98. Wing length / length of profemur 2.54–2.66.

Coloration. Thorax dark brown with light brown stripes, head and abdomen light brown, legs pale brown.

Antenna. Antennal ratio (AR) = 1.01–1.06. Ultimate flagellomere 364–368 μm long.

Head. Temporal setae 6–10 including 3–4 inner verticals, 2–3 outer verticals and 1–3 postorbitals. Clypeus with 3–4 setae. Tentorium 84–99 μm long, 19–21 μm wide. Stipes 83–92 μm long, 8–10 μm wide. Palp segment lengths (in μm): 17–21, 35–37, 61–69, 48–52, 59–75. Third palpomere with 2–4 sensilla clavata subapically, longest 11–14 μm long.

Thorax. Antepronotum with 1–3 setae. Dorsocentrals 5–6; acrostichals 7–10, weak, scalpellate in mid scutum; prealars 2–4; supraalar 1. Scutellum with 4 setae, uniserial.

Wing ( Figure 1 ). Venarum ratio (VR) = 1.34–1.42. Costal extension 44–49 μm long. Brachiolum with 1 seta, remaining cells and veins bare. Squama with 3–4 setae.

Legs. Spur of fore tibia 36–45 μm long, spurs of mid tibia 23–26 μm and 21–23 μm long, spurs of hind tibia 41–43 μm and 18–22 μm long. Width at apex of fore tibia 22–24 μm, of mid tibia 25–28 μm, of hind tibia 29–30 μm. Comb with 10–12 setae, longest 25–32 μm, shortest 14–17 μm long. Lengths and proportions of legs as in Table 1.

Hypopygium ( Figures 3–5 ). Tergite IX covered with coarse microtrichia; laterosternite IX with 6–12 setae. Anal point with basal swelling, 46–50 μm long from base of swelling, swelling 30–31 μm wide, apical, bare part 23–28 μm long with bluntly rounded apex, 11–13 μm wide at base, 7–8 μm wide apically, with 13–15 strong, anteriorly directed marginal and ventral setae. Phallapodeme 72–77 μm long; transverse sternapodeme arched, 46–49 μm long. Virga composed of 2 spines, 11–17 μm long. Gonocoxite 124–132 μm long. Inferior volsella 57–65 μm long, with slightly curved, parallel-sided base and ovate, 28–30 μm long, 15–19 μm wide apical part, with 8–11 weak setae. Gonostylus club-shaped, 63–71 μm long; megaseta 6–7 μm long. Hypopygium ratio (HR) = 1.84–2.00. Hypopygium value (HV) = 3.04–3.20. Biology and distribution: The species is only known from the type locality, Reserva Adolpho Ducke, a 10,000 ha reserve in the outskirts of Manaus in the Amazonas State, Brazil. The single male was collected in a Malaise trap situated close to a stream and several temporary pools. The area is covered with primary forest and is relatively flat. During the rainy season numerous small pools are formed scattered on the forest floor.

Reserva Adolpho Ducke is also the type locality for Ablabesmyia communiba Neubern, 2013 , Ablabesmyia ducke Neubern, 2013 , Beardius curticaudatus Pinho, Mendes & Andersen, 2013 , Dicrotendipes fittkaui Epler, 1988 , Lipurometriocnemus amazonicus Andersen, Pinho & Mendes, 2016 , Litocladius joergeni Andersen, 2016 , Litocladius neusae Mendes, Andersen & Hagenlund, 2011 , Mariambera mariae Andersen, Mendes & Pinho, 2015 , Saetherocryptus amazonicus Andersen & Pinho, 2014 , Thalassosmittia amazonica Andersen & Pinho, 2014 and Titimbera amazonica Andersen, Pinho & Mendes, 2015 ( Epler 1988, Mendes et al. 2011, Oliveira et al. 2013, Pinho et al. 2013, Andersen & Pinho 2014a, 2014b, Andersen et al. 2015a, 2015b, 2016, Andersen 2016).

Figures

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

FIGURES 3–5. Antillocladius bulbosus sp. n., male. 3. Hypopygium, dorsal view. 4. Hypopygium with anal point and tergite IX removed, dorsal aspect to the left and ventral aspect to the right. 5. Anal point, ventral view.