Parorthocladius concretus, Liu, Yuedan & Wang, Xinhua, 2005

Liu, Yuedan & Wang, Xinhua, 2005, (Diptera: Chironomidae: Orthocladiinae), Zootaxa 802, pp. 1-8 : 2-4

Parorthocladius concretus sp. nov. ( Figs. 1–2 )

Male imago (n = 1).

Total length 3.96 mm. Wing length 2.46 mm. Total length/wing length 1.61. Wing length/profemur length 1.30.

Coloration: Head, abdominal segments and legs brown. Thorax brown with reddish brown vittae and preepisternum. Wings light brown.

Head: Terminal flagellomere 561 m long, without strong subapical seta. AR 1.17. Temporal setae 12, including 6 inner verticals, 4 outer verticals and 2 postorbitals. Clypeus with 12 setae. Tentorium 258 m long, stipes 169 m long. Palpomere lengths (m): 42, 70, 167, 140, 223.

Thorax: Antepronotum with 3 lateral setae. Dorsocentrals 8, prealars 5. Scutellum with 10 setae.

Wing ( Fig. 1 ): Anal lobe well developed. VR 1.06. R2+3 ends 1/3 distance between R1 and R4+5. Costa extension 32 m long. Brachiolum without seta; R with 6 setae, remaining veins bare. End of Cu1 slightly recurved. Squama with 18 setae.

Legs: Spur of front tibia 63 m long, without denticles. Spurs of middle tibia 33 m and 28 m long, of hind tibia 70 m and 58 m long. Hind tibial comb with 10 setae. Middle and hind tibial spurs with weak denticles. Two pseudospurs present on tarsi III of middle and hind legs ( Table 1 ):

Hypopygium ( Fig. 2 ): Anal point parallel sided with blunt apex, 55 m long, 23 m wide at base, anal point length/width 2.39, with 6 lateral setae. Tergite IX with 11 long setae, laterosternite IX with 7 setae. Phallapodeme with hooked apex, 126 m long; transverse sternapodeme arcuate, 140 m long, with oral projection. Gonocoxite 321 m long. Gonostylus slightly arched, 126 m long, with 4 stout setae on inner side. Inferior volsella double, dorsal part triangular and well sclerotized, ventral part oval and with more than 20 long setae. Crista dorsalis present at apex of gonostylus. Megaseta 14 m long. HR 2.55, HV 3.14.

Female and immature stages: unknown.

Holotype: Male, P. R. CHINA: Ningxia Autonomous Region, Liupan Mountain, Erlong River (35° 24 N, 106° 14 E), alt. 1700 m, 7. VIII 1987, sweep net, X. Wang, slide no. 0 1369.

Etymology: From Latin concretus , hardness, referring to the sclerotic inferior volsella. Distribution: The species is known only from the type locality and was collected by sweep netting.

Remarks: The male imago differs from those of other known species of the genus by the following combination of characters: double inferior volsella (dorsal one triangular and sclerotized, ventral one oval with long setae); hooked apex on phallapodeme, long setae on tergite IX, and short anal point.

Figures

FIGURES 1 – 2: Parorthocladius concretus sp. nov. (Holotype): 1, wing (scale = 0.5 mm). 2, hypopygium (scale = 0.2 mm). FIGURES 3 – 4: Parorthocladius cristatus sp. nov. (Holotype): 3, wing (scale = 0.5 mm). 4, hypopygium (scale = 0.2 mm).

Tables

TABLE 1. P. concretus sp. nov. Lengths (m) and proportions of leg segments.

fe	ti	ta1	ta2	ta3	ta4	ta5	LR
P1 1070	1030	780	­	­	­	­	0.78
P2 1100	950	550	360	270	180	140	0.59
P3 1200	1170	720	410	320	210	150	0.62