Antillocladius ultimus, 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 : 38-40

Antillocladius ultimus sp. n.

( Figs 38–42 )

Type material: Holotype male, BRAZIL: Rio de Janeiro: Arraial do Cabo, Morro do Atalaia , 10.i.2006, sweep net (swarming), H.F. Mendes ( MZUSP) . Paratypes: 13 males, same data as holotype . 1 male, São Paulo: Ribeirão Preto, University of São Paulo Campus , 26–29.i.2003, Malaise trap, H.F. Mendes & T. Andersen ( ZSM, ZMBN) .

Diagnostic characters: The species can be separated from all other members of the genus by the dark area on the inferior volsella.

Etymology: From Latin, ultimus , meaning last, as this is the last Antillocladius species to be described here.

Male (n =10, except when otherwise stated). Total length 1.78–2.39, 2.13 mm. Wing length 1.07–1.36, 1.26 mm. Total length / wing length 1.48–1.78, 1.68. Wing length / length of profemur 2.24–2.67, 2.43. Coloration brown, thorax light brown with markings on preepisternum, median anepisternum and notum; legs and tarsi uniformly light brown.

Head. AR 1.22–1.43, 1.31. Ultimate flagellomere 382–482, 436 µm long. Temporal setae 8–11, 10; including 3–4, 4 inner verticals; 3–4, 3 outer verticals; and 2–3, 3 postorbitals. Clypeus with 5–13, 8 setae. Tentorium, stipes, and cibarial pump as in Figure 38 . Tentorium 84–125, 111 µm long; 16–25, 21 µm wide. Stipes 104–125, 118 µm long. Palp segment lengths (in µm): 18–25, 22; 36–50, 42; 77–104, 89; 82–104, 93; 95–127, 109. Third palpomere with 2–5, 4 sensilla clavata subapically, longest 9–16, 11 µm long.

Thorax ( Fig. 39 ). Antepronotum with 2–4, 3 setae. Dorsocentrals 8–12, 10, acrostichals composed of 0–4, 2 anterior simple and 7–17, 11 scalpellate posterior setae; prealars 2–4, 3; supraalar 1–2, 1. Scutellum with 4– 8, 6 setae.

Wing ( Fig. 40 ). VR 1.31–1.37, 1.33. C extension 41–95, 78 µm long. Brachiolum with 1 seta; R with 0–4, 2 setae, other veins and cells bare. Squama with 5–7, 6 setae.

Legs. Spur of foretibia 41–54, 51 µm long; spurs of midtibia 27–38, 32 µm and 16–31, 23 µm long; spurs of hind tibia 43–59, 49 µm and 16–25, 21 µm long. Width at apex of foretibia 27–36, 31 µm; of midtibia 29– 36, 33 µm; of hind tibia 34–48, 40 µm. Comb with 13–17, 14 setae; longest 29–41, 36 µm; shortest 16–23, 20 µm. Lengths and proportions of legs as in Table 7.

Hypopygium ( Figs 41–42 ). Tergite IX covered with microtrichia; laterosternite IX with 5–9, 7 setae. Anal point triangular; 43–73, 53 (4) µm long; 23–45, 32 (4) µm wide at base; 5–7, 6 (4) µm wide at apex; with 11– 22, 14 (4) setae. Phallapodeme 75–95, 86 µm long; transverse sternapodeme 34–48, 39 µm long. Virga 29–48, 34 µm long. Gonocoxite 150–184, 171 µm long. Gonostylus 77–98, 87 µm long; megaseta 11–16, 14 µm long. HR 1.70–2.20, 1.98; HV 2.12–2.83, 2.46.

Remarks: This species frequently has a bent anal point, which is considered an artifact due to the slidemounting.

Biology and distribution: This species was taken together with A. atalaia , A. axitiosus , and A. brazuca in Arraial do Cabo, Rio de Janeiro State; and with A. campususp , A. folius , and A. musci in Ribeirão Preto, São Paulo State. See A. atalaia sp. n. for more details.

Figures

FIGURES 38–42. Antillocladius ultimus sp. n., male. 38—tentorium, stipes, and cibarial pump; 39—thorax; 40—wing; 41—anal point and tergite IX and dorsal aspect of left gonocoxite and gonostylus; 42—hypopygium with anal point and tergite IX removed, dorsal aspect to the left and ventral aspect to the right.