Lyrocladius radulatus, Mendes & Andersen, 2008

Mendes, Humberto Fonseca & Andersen, Trond, 2008, A review of Antillocladius Saether and Litocladius Mendes, Andersen et Saether, with the description of two new Neotropical genera (Diptera, Chironomidae, Orthocladiinae), Zootaxa 1887 (1), pp. 1-75 : 62-64

Lyrocladius radulatus sp. n.

( Figs 90–95 )

Type material: Holotype male, BRAZIL: Paraná: Morretes, Parque Estadual do Pau Oco , 25°34'27.9''S 48°53'46.7''W, 07–10.iv.2002, Malaise trap (Trilha-5), M.T. Tavares et al. ( BIOTA-FAPESP) ( MZUSP) . Paratypes: 1 male, as holotype except for 10–13.iv.2002, Malaise trap (Bosque-4). 1 male, Rio de Janeiro: Nova Iguaçu, Reserva Biológica Tinguá , 22°34'28''S 43°26'09''W, 5–8.iii.2002, Malaise trap (Trilha-5), S.T.P. Amarante et al. ( BIOTA-FAPESP) ; 1 male, as previous except for 22°34'27''S 43°26'11.4''W, Malaise trap (Bosque-6) ( MZUSP, ZMBN) .

Diagnostic characters: See diagnostic characters for the genus.

Etymology: From Latin radula, scraper, adding the suffix -atus; referring to the resemblance of the gonostylus with the radula of some Gastropoda.

Male (n = 4, except when otherwise stated). Total length 1.38–1.52, 1.46 mm. Wing length 0.87–0.91, 0.89 mm. Total length / wing length 1.58–1.70, 1.64. Wing length / length of profemur 2.50–2.57, 2.54. Coloration brown; thorax light brown with dark markings on preepisternum, median anepisternum and notum; legs and tarsi uniformly light brown.

Head ( Fig. 90 ). AR 0.74–0.85, 0.77. Ultimate flagellomere 223–252, 235 µm long. Temporal setae 7–10, 9; including 3–5, 4 inner verticals; 3–5, 3 outer verticals; and 1–2, 2 postorbitals. Clypeus with 4–9, 6 setae. Tentorium, stipes, and cibarial pump as in Figure 91 . Tentorium 70–102, 83 µm long; 14–19, 15 µm wide. Sti- pes 70–86, 80 µm long. Palp segment lengths (in µm): 13–16, 14; 27–30, 28; 43–59, 53; 52–59, 55; 57–75, 69. Third palpomere with 2–3 sensilla clavata subapically, longest 9–14, 11 µm long.

Thorax ( Fig. 92 ). Antepronotum with 0–1, 1 seta. Dorsocentrals 6–9, 7; acrostichals 7–19, 14 beginning close to antepronotum, composed of 4–10, 6 anterior simple and 3–13, 8 posterior scalpellate; prealars 3; supraalar 1. Scutellum with 4 setae.

Wing ( Fig. 93 ). VR 1.40–1.47, 1.43. C extension 77–86, 81 µm long. Brachiolum with 1 seta; R with 0–1, 1 seta; other veins and cells bare. Squama with 1 seta.

Legs. Spur of foretibia 29–44, 35 µm long; spurs of midtibia 17–20, 19 µm and 13–16, 15 µm long; spurs of hind tibia 25–41, 33 µm and 12–18, 15 µm long. Width at apex of foretibia 20–23, 21 µm; of midtibia 21– 23, 22 µm; of hind tibia 27–29, 28 µm. Comb with 10–12, 11 setae; longest 27–34, 30 µm; shortest 15–18, 17 µm long. Lengths and proportions of legs as in Table 15.

Hypopygium ( Figs 94–95 ). Tergite IX covered with microtrichia; laterosternite IX with 2–5, 4 setae. Anal point triangular, lyre-shaped; 29–34, 32 µm long; 25–27, 26 µm wide at base; 3–5, 4 µm wide at apex; with 14–21, 16 strong marginal setae. Phallapodeme 52–64, 58 µm long; transverse sternapodeme 48–61, 54 µm long. Virga 65–75, 70 µm long. Gonocoxite 118–132, 124 µm long. Gonostylus 68–75, 71 µm long; megaseta 9–12, 11 µm long. HR 1.62–1.90, 1.75; HV 1.90–2.23, 2.07.

Distribution: The species is known from Paraná and Rio de Janeiro States in Brazil. All specimens were collected with Malaise traps.

Figures

FIGURES 90–95. Lyrocladius radulatus sp. n., male. 90—head; 91—tentorium, stipes, and cibarial pump; 92—thorax; 93—wing; 94—anal point and tergite IX and dorsal aspect of left gonocoxite and gonostylus; 95—hypopygium with anal point and tergite IX removed, dorsal aspect to the left and ventral aspect to the right.