Litocladius joergeni, Andersen, 2016

Andersen, Trond, 2016, A new species of Litocladius Mendes, Andersen & Saether, 2004 from the Amazon rainforest, Brazil (Diptera, Chironomidae, Orthocladiinae), Norwegian Journal of Entomology 63, pp. 164-168 : 165-167

Litocladius joergeni sp. n. ( Figures 1–5 )

Type material: Holotype: male, BRAZIL, Amazonas State, Manaus, Reserva Adolpho Ducke , 1 km after entrance, 04–08.II.2010, Malaise trap, leg. L.C. Pinho & H.F. Mendes ( MZUSP).

Etymology: The species is named after Jørgen Rieber-Mohn for all help and support.

Diagnostic characters: The new species can be separated from its congeners by having apical spine on third palpomere combined

with a subquadrangular inferior volsella with several strong setae, a very long, complex virga surrounded by strong lamellae and wing with setae only on vein M 1+2 and in cell r 4+5.

Description: Male (n = 1). Total length 2.91 mm. Wing length 1.54 mm. Total length / wing length 1.89. Wing length / length of profemur 2.52.

Coloration. Brown, thorax with light brown stripes, legs light brown, abdomen brown with dark brown hypopygium.

Andersen: A new species of Litocladius from the Amazon rainforest

Antenna. Antennal ratio (AR) = 1.49. Ultimate flagellomere 572 μm long.

Head. Temporal setae 11 including 4 inner verticals, 2 outer verticals and 5 postorbitals. Clypeus with 5 setae. Tentorium, stipes and cibarial pump as in Figure 1 . Tentorium 119 μm long, 25 μm wide. Stipes 129 μm long, 37 μm wide. Palp segment lengths (in μm): 26, 48, 110, 117, 132. Third palpomere with 3 sensilla clavata subapically, longest 8 μm long; and apparently with 1 apical spine – spine missing, but third palpomere with strong, apical scar.

Thorax ( Figure 2 ). Antepronotum with 4 setae. Dorsocentrals 10; acrostichals 17 composed of 6 anterior weak decumbent, 3 weak hair-like and 8 scalpellate in mid scutum; prealars 5; supraalar 1. Scutellum with 11 setae, uniserial.

Wing ( Figure 3 ). Venarum ratio (VR) = 1.26. Costal extension 35 μm long. Brachiolum with 1 seta, M 1+2 with 6 setae apically, cell r 4+5 with 12 setae, remaining cells and veins bare. Squama with 10 setae.

Legs. Spur of fore tibia 58 μm long, spurs of mid tibia 33 μm and 21 μm long, spurs of hind tibia 65 μm and 32 μm long. Width at apex of fore tibia 28 μm, of mid tibia 36 μm, of hind tibia 44 μm. Comb with 10 setae, longest 40 μm, shortest 25 μm long. Lengths and proportions of legs as in Table 1.

Hypopygium ( Figures 4–5 ). Tergite IX covered with microtrichia, with 2 strong setae to each side of the base of the anal point; laterosternite IX with 4 setae. Anal point tapering, 80 μm long, 33 μm wide at base, 2 μm wide at apex, with 14 strong, marginal setae. Phallapodeme 119 μm long; transverse sternapodeme weakly curved, 127 μm long. Virga complex, 150 μm long including 11 μm long apical pincer-shaped part, surrounded by strong lamellae. Gonocoxite 207 μm long. Inferior volsella subquadrangular, 37 μm long, 41 μm wide, ending 73 μm from apex of gonocoxite. Gonostylus 113 μm long, with rounded, apical crista dorsalis; megaseta 12 μm long. Hypopygium ratio (HR) = 1.83. Hypopygium value (HV) = 2.58.

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 , Ablabesmyia ducke Neubern , Beardius curticaudatus Pinho, Mendes & Andersen , Dicrotendipes fittkaui Epler , Lipurometriocnemus amazonicus Andersen, Pinho & Mendes , Litocladius neusae Mendes, Andersen & Hagenlund , Mariambera mariae Andersen, Mendes & Pinho , Saetherocryptus amazonicus Andersen & Pinho , Thalassosmittia amazonica Andersen & Pinho and Titimbera amazonica Andersen, Pinho & Mendes ( Epler 1988, Mendes et al. 2011, Oliveira et al. 2013, Pinho et al. 2013, Andersen & Pinho 2014a, 2014b, Andersen et al. 2015a, 2015b, 2016).

Figures

FIGURES 1–3. Litocladius joergeni sp. n., male. 1. Tentorium, stipes and cibarial pump. 2. Thorax. 3. Wing.

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