Parapsectrocladius acuminatus (Edwards)

Donato, Mariano, Mauad, Melina & Fuentes, María Cecilia, 2015, A new species of Parapsectrocladius Cranston (Diptera: Chironomidae: Orthocladiinae) from Patagonia, Argentina, Zootaxa 3911 (4), pp. 547-559 : 552-553

Parapsectrocladius acuminatus (Edwards)

Cardiocladius acuminatus Edwards 1931: 275 .

Paratrissocladius acuminatus ; Halvorsen 1988 (comb. n., redescription of male); Spies & Reiss 1996 (catalog). Parapsectrocladius acuminatus ; Cranston 2000 (comb. n., description of larva and pupa); Donato et al. 2008 (checklist, new record), Ashe & O'Oconnor 2012 (catalog).

Material examined. ARGENTINA: 6 males, Río Negro, P. N. Nahuel Huapi, Manso medio, La Cantera, 41°21'16''S – 71°42'27.3''W, 764 m a.s.l., 15-i/ 2-ii-2007, Malaise trap, Garré-Montes de Oca cols. ( MLP); 1male, Río Negro, P. N. Nahuel Huapi, río Ñirihuau, 41°17'35.1''S – 71°14'26.3''W, 1044 m a.s.l., 15-ii/ 28-ii-2007, Malaise trap, Garré-Montes de Oca cols. ( MLP); 2 males, Tierra del Fuego, Río Moat y Ruta Comp. J, 54°58'03.9''S – 66°44'35.7''W, 2-xii-2008, Malaise trap, M. Donato & G. Spinelli cols. ( MLP).

Male (n = 9). Total length 2.80–3.82 mm. Wing length 1.54–2.06 mm. Total length/wing length 1.63–2.05. Wing length/length of profemur 2.37–2.58.

Head. AR 0.98–1.26, ultimate flagellomere 371–481 long. Temporal setae 5–9, divided in 1 inner vertical and 4–8 outer verticals. Clypeus with 6–14 setae. Tentorium 164–208 long and 30–60 wide. Palpomere lengths (1–5): 44–62; 42–70; 112–150; 108–140; 160–196.

Thorax. Antepronotum with 6–8 lateral setae. Acrostichals 5–10 (6). Dorsocentrals 7–13; prealars 2–4; supraalar 0–1 (7). Scutellum with 5–11 setae.

Wing. VR 1.14–1.22. C extension 0–36 (8) long. Brachiolum with 1–2 seta. R with 9–18; R1 with 3–8 setae. Squama with 10–20 setae.

Legs. Spur of front tibia 48–90 (8) long; spurs of mid tibia 18–28 and 24–32; of hind tibia: 18–30 and 56–99 long. Width at apex of front tibia 42–56; of mid tibia 40–58; of hind tibia 48–70. Sensilla chaetica of tarsomere 1 of midleg 4–11. Comb with 9–11 setae. Lengths and proportions of legs in Table 2 .

Hypopygium. Tergum IX with 6–10 (8) setae. Anal point 80–130 (8) long, width at base 30–44 (6), and with 12–17 (7) setae.Phallapodeme 78–176 long; transverse sternapodeme 66–82 long. Gonocoxite 264–328 long; length from base of gonocoxite to apex of inferior volsella/length of gonocoxite 0.6–0.68. Gonostylus 104–159 long; megaseta 10–18 (8) long. HR 1.97–2.56; HV 2.14–3.05.

Geographic distribution. This species was known from the Valdivian forest in Chile (its holotype and the new material studied by Cranston 2000) and the surrounding area of Bariloche in Rio Negro province ( Argentina) ( Donato et al. 2008). New material allows us to extend its distribution to Tierra del Fuego province ( Argentina), located in the southernmost distribution of the Subantarctic forest.

Tables

TABLE 2. Lengths (in Μm) and proportions of legs of Parapsectrocladius acuminatus (Edwards) (male, n = 9). For abbreviation explanations see Table 1.

Fe ti	ta1	ta2	ta3
P1 647–797 797–947	615–789	323–434	197–252
P2 655–828 742–884	379–497	197–276	110–158
P3 679–907 773–1089	418–718 (8)	221–402 (8)	126–189 (8)
ta4 ta5	LR	BV	SV
P1 95–118 103–126	0.77–0.83	2.72–2.87	2.21–2.35
P2 71–103 95–134	0.51–0.56	3.28–3.75	3.44–3.83
P3 79–118 (8) 87–142 (8)	0.54–0.66 (8)	3.19–3.65 (8)	2.77–3.55 (8)