Saetherocladius fusus, Andersen, Trond, Mendes, Humberto F. & Pinho, Luiz C., 2010

Andersen, Trond, Mendes, Humberto F. & Pinho, Luiz C., 2010, Four new species of Saetherocladius Andersen et Mendes from Mata Atlântica, Brazil (Diptera: Chironomidae: Orthocladiinae), Zootaxa 2608, pp. 45-56 : 49-51

Saetherocladius fusus sp. n.

( Figs 9–13 )

Type material. Holotype male, slide mounted in Canada balsam. Brazil: Santa Catarina State, Urubici, Morro da Igreja, 1.822 m a.s.l., 18.ix–5.xii.2004, Malaise trap, cloud forest, L.C. Pinho & L.E.M. Bizzo ( MZUSP).

Diagnostic characters. The species can be separated from the other species in the genus by the following combination of characters: AR 0.70; virga 16 µm long; inferior and superior volsella well separated; inferior volsella sharply triangular, with dorsal microtrichia; gonostylus with strong outer projection and anal point tapering.

Etymology. From Latin fusus , spindle, referring to the shape of the gonostylus.

Male (n = 1). Total length 1.67 mm. Wing length 1.15 mm. Total length / wing length 1.45. Wing length / length of profemur 2.66.

Coloration. Thorax and head dark brown; legs, abdomen and antennae brown.

Head. AR 0.70. Ultimate flagellomere 256 µm long. Temporal setae 5 including 2 inner verticals and 3 outer verticals. Clypeus with 6 setae. Tentorium, stipes and cibarial pump as in Figure 9 . Tentorium 84 µm long, 18 µm wide at sieve pore. Stipes 37 µm long. Palp segment lengths / widths (in µm): 16 / 14, 27 / 16, 70 / 20, 61 / 20, 84 / 14. Third palpomere with 4 sensilla clavata subapically, longest 16 µm long.

Thorax ( Fig. 10 ). Antepronotum with 2 setae. Dorsocentrals 14; acrostichals 16, starting close to antepronotum; prealars divided into 3 posterior and 4 anterior setae; supraalar 1. Scutellum with 4 setae.

Wing ( Fig. 11 ). VR 1.50. Costa not extended. Brachiolum with 1 seta, R with 5 setae, other veins bare. Squama bare.

Legs. Spur of fore tibia 50 µm long, spurs of mid tibia 20 µm and 11 µm long, spurs of hind tibia 34 µm and 11 µm long. Width at apex of fore tibia 26 µm, of mid tibia 27 µm, of hind tibia 34 µm. Comb with 14 setae, longest 27 µm long, shortest 16 µm long. Lengths and proportions of legs as in Table 3.

fe ti ta1 ta2 ta3 ta4 ta5 LR BV SV BR p1 137 64 34 – – – – 0.47 – 4.01 2.7 p2 122 117 52 28 16 8 10 0.44 4.69 4.60 3.0 p3 132 141 89 41 38 14 13 0.63 3.41 3.07 3.1 Hypopygium ( Figs 12–13 ). Anal point 15 µm long, 7 µm wide at base, 4 µm wide at apex, with 9 setae basally. Laterosternite IX with 4 setae. Phallapodeme 54 µm long; transverse sternapodeme 66 µm long. Virga 16 µm long. Gonocoxite 116 µm long. Gonostylus 73 µm long, with large, rounded crista dorsalis and strong outer projection; megaseta 9 µm long. HR 1.59. HV 2.28.

Female and immatures. Unknown.

Distribution and ecology. This species was collected in a Malaise trap in a pristine cloud forest at 1.822 m a.s.l. in Santa Catarina State.

Figures

FIGURES 9 – 13. Saetherocladius fusus sp. n., male. 9 — tentorium, stipes and cibarial pump; 10 — thorax; 11 — wing; 12 — anal point and tergite IX and dorsal aspect of left gonocoxite and gonostylus; 13 — hypopygium with tergite IX and anal point removed, dorsal aspect to the left, ventral aspect to the right.