Saetherocladius fusticulus, 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 : 47-49

Saetherocladius fusticulus sp. n.

( Figs 3–8 )

Type material. Holotype male, slide mounted in Canada balsam. Brazil: São Paulo State, Parque Estadual Intervales, Ribeirão Grande, Barra Grande, 24o15'S, 48o10'W, 10–13.xii.2000, Malaise trap (Trilha 2), M.T. Tavares et al. ( MZUSP). Paratype: 1 male, as holotype ( ZMBN).

Diagnostic characters. This species can be separated from the other species in the genus by the following combination of characters: AR 0.45; virga 6–9 µm long; inferior volsella rounded, with dorsal microtrichia; gonostylus without outer projection and anal point tapering.

Etymology. From Latin fustis, club, bludgeon, referring to the shape of the gonostylus.

Male (n = 1–2). Total length 1.16–1.49 mm. Wing length 709–903 µm. Total length / wing length 1.64– 1.65. Wing length / length of profemur 2.57–2.88.

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

Head. AR 0.45. Ultimate flagellomere 126 µm long. Temporal setae 4–6 including 0–2 inner verticals, 3 outer verticals and 1 postorbital. Clypeus with 5–7 setae. Tentorium, stipes, and cibarial pump as in Figure 3 . Tentorium 73–84 µm long, 11–18 µm wide at sieve pore. Stipes 63–79 µm long, 20 µm wide. Palp segment lengths / widths (in µm): 11–18 / 10–14, 20–27 / 14–17, 43–46 / 17, 52 / 14, fifth segment lost. Third palpomere with 4–5 sensilla clavata subapically, longest 9–10 µm long.

Thorax ( Fig. 4 ). Antepronotum with 3–4 setae. Dorsocentrals 13–15; acrostichals 13–15, starting close to antepronotum; prealars divided into 3 posterior and 2–3 anterior setae; supraalar 1. Scutellum with 4 setae.

Wing ( Fig. 5 ). VR 1.48–1.68. Costal extension 11–14 µm long. Brachiolum with 1 seta, R with 2–3 setae, other veins bare. Squama with 0–2 setae.

Legs. Spur of fore tibia 29–48 µm long, spurs of mid tibia 11–20 µm and 9–10 µm long, spurs of hind tibia 27–34 µm and 12–14 µm long. Width at apex of fore tibia 18–23 µm, of mid tibia 18–23 µm, of hind tibia 27– 31 µm. Comb with 15–16 setae, longest 25–29 µm long, shortest 16–18 µm long. Lengths and proportions of legs as in Table 2.

Hypopygium ( Figs 6–8 ). Anal point 25 µm long, 6–7 µm wide at base, 2–3 µm wide at apex, with 4–6 setae basally. Laterosternite IX with 3 setae. Phallapodeme 48–59 µm long; transverse sternapodeme 43–57 µm long. Virga 6–9 µm long. Gonocoxite 88–107 µm long. Gonostylus 47–51 µm long, with subtriangular crista dorsalis; megaseta 4–8 µm long. HR 1.86–2.09. HV 2.47–2.92.

Female and immatures. Unknown.

Distribution and ecology. The species was collected in a Malaise trap in Parque Estadual Intervales in São Paulo State, indicating a distribution in coastal areas with primary Atlantic forest.

Figures

FIGURES 3 – 8. Saetherocladius fusticulus sp. n., male. 3 — tentorium, stipes and cibarial pump; 4 — thorax; 5 — wing; 6 — anal point and tergite IX and dorsal aspect of left gonocoxite and gonostylus; 7 — hypopygium with tergite IX and anal point removed, dorsal aspect to the left, ventral aspect to the right; 8 — gonostylus with crista dorsalis projecting upwards.