Antillocladius gephyrus, 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 : 31-33

Antillocladius gephyrus sp. n.

( Figs 28–32 )

Type material: Holotype male, BRAZIL: Santa Catarina: Florianópolis , UCAD, 10–13.xii.2002, Malaise trap, L.C. Pinho ( MZUSP) . Paratype: 1 male, same data as holotype .

Diagnostic characters: The species can be separated from all other members of the genus by the absence of virga and the shape of the inferior volsella having a dorsal ridge.

Etymology: From Greek, gephyra, meaning bridge, referring to the shape of the inferior volsella.

Male (n = 1–2). Total length 1.68–1.76 mm. Wing length 1.00–1.10 mm. Total length / wing length 1.59– 1.67. Wing length / length of profemur 2.48–2.67. Coloration light brown, thorax brown without distinct marks.

Head. AR 0.94–1.11. Ultimate flagellomere 324–367 µm long. Temporal setae 8, including 3 inner verticals, 2–3 outer verticals, and 2–3 postorbitals. Clypeus with 4–5 setae. Tentorium, stipes, and cibarial pump as in Figure 28 . Tentorium 86–101 µm long, 14–17 µm wide. Stipes not measurable. Palp segment lengths (in µm): 14–16, 23–36, 91, 79, 95. Third palpomere with 2 sensilla clavata subapically, longest 14 µm long.

Thorax ( Fig. 29 ). Antepronotum with 2–3 setae. Dorsocentrals 7, acrostichals composed of 0–3 simple anterior and 9–10 scalpellate posterior setae, prealars 3–4, supraalars 1–2. Scutellum with 4–6 setae.

Wing ( Fig. 30 ). VR 1.29–1.38. C extension 68–75 µm long. Brachiolum with 1 seta, C extension with 0–3 non-marginal setae, cell r 4+5 with 0–15 setae, m with 0–4 setae, other veins and cells bare. Squama with 1–3 setae.

1+2

Legs. Midleg lost in both specimens. Spur of foretibia 27–38 µm long, spurs of hind tibia 36 µm and 18 µm long. Width at apex of foretibia 27–45 µm, of hind tibia 39 µm. Comb with 13 setae, longest 32 µm, shortest 18 µm. Lengths and proportions of legs as in Table 5.

Hypopygium ( Figs 31–32 ). Tergite IX covered with microtrichia, laterosternite IX with 5–6 setae. Anal point narrowly triangular, 32–36 µm long, 11–14 µm wide at base, 2 µm wide at apex, with 9–13 setae. Phallapodeme 61–68 µm long, transverse sternapodeme 61 µm long. Virga absent. Gonocoxite 123–132 µm long. Gonostylus 61 µm long, megaseta 7–9 µm long. HR 2.00–2.15, HV 2.73–2.87.

Biology and distribution: The species is known from the Santa Catarina State, Brazil, where it was collected in a reserve with secondary forest together with A. brazuca sp. n. and A. antecalvus .

Figures

FIGURES 28–32. Antillocladius gephyrus sp. n., male. 28—tentorium, stipes, and cibarial pump; 29—thorax; 30— wing; 31—anal point and tergite IX and dorsal aspect of left gonocoxite and gonostylus; 32—hypopygium with anal point and tergite IX removed, dorsal aspect to the left and ventral aspect to the right.