Antillocladius axitiosus, 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 : 24-26

Antillocladius axitiosus sp. n.

( Figs 13–17 )

Type material: Holotype male, BRAZIL: Rio de Janeiro: Arraial do Cabo, Morro do Atalaia , 10.i.2006, sweep net (swarming), H.F. Mendes ( MZUSP).

Diagnostic characters: The species can be separated from all other members of the genus by the presence of setae on the squama, anal point parallel-sided, rounded inferior volsella, and long costal extension.

Etymology: From Latin, axitiosus , meaning together, in combination, as the species can only be identified by a combination of characters.

Male (n = 1). Total length 1.99 mm. Wing length 1.21 mm. Total length / wing length 1.65. Wing length / length of profemur 2.38. Coloration light brown, thorax light brown, foreleg darker than mid- and hind leg.

Head. AR 1.22. Ultimate flagellomere 396 µm long. Temporal setae 8, including 2 inner verticals, 3 outer verticals, and 3 postorbitals. Clypeus with 9 setae. Tentorium, stipes, and cibarial pump as in Figure 13 . Tentorium 86 µm long, 20 µm wide. Stipes 84 µm long. Palp segment lengths (in µm): 18, 38, 91, 86, 100. Third palpomere with 5 sensilla clavata subapically, longest 11 µm long.

Thorax ( Fig. 14 ). Antepronotum with 2 setae. Dorsocentrals 7, acrostichals 18, composed of 6 simple anterior and 12 scalpellate posterior; prealars 3; supraalar 1. Scutellum with 4 setae.

Wing ( Fig. 15 ). VR 1.36. C extension 95 µm long. Brachiolum with 1 setae, R with 0–1 seta, other veins and cells bare. Squama with 4 setae.

Legs. Spur of foretibia 50 µm long, spurs of midtibia 32 µm and 20 µm long, spurs of hind tibia 48 µm

and 20 µm long. Width at apex of foretibia 29 µm, of midtibia 29 µm, of hind tibia 36 µm. Comb with 17 setae, longest 34 µm, shortest 21 µm. Lengths and proportions of legs as in Table 2.

Hypopygium ( Figs 16–17 ). Tergite IX covered with microtrichia; laterosternite IX with 5 setae. Anal point triangular, 66 µm long, 14 µm wide at base, 7 µm wide at apex, with 11 setae. Phallapodeme 73 µm long, transverse sternapodeme 23 µm long. Virga 34 µm long. Gonocoxite 138 µm long. Gonostylus 70 µm long, megaseta 14 µm long. HR 1.97, HV 2.83.

Biology and distribution: The species was taken together with A. atalaia sp. n. in Rio de Janeiro State, Brazil (see above).

Figures

FIGURES 13–17. Antillocladius axitiosus sp. n., male. 13—tentorium, stipes, and cibarial pump; 14—thorax; 15— wing; 16—anal point and tergite IX and dorsal aspect of left gonocoxite and gonostylus; 17—hypopygium with anal point and tergite IX removed, dorsal aspect to the left and ventral aspect to the right.