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

Liu, Yuedan & Wang, Xinhua, 2005, (Diptera: Chironomidae: Orthocladiinae), Zootaxa 802, pp. 1-8 : 4-5

Parorthocladius cristatus sp. nov. (Figs. 3–4)

Male imago (n = 1).

Total length 4.24 mm. Wing length 2.87 mm. Total length/wing length 1.48. Wing length/profemur length 2.43.

Coloration: Head dark brown. Thorax brown with darker vittae, median postnotum, and preepisternum. Abdominal segments IV brown, VIVIII blackish green, and IX black. Legs yellowish brown. Wings light brown.

Head: [Antenna missing]. Temporal setae 17, including 10 inner verticals, 2 outer verticals and 5 postorbitals. Clypeus with 18 setae. Tentorium 229 m long, stipes 195 m long. Palpomere lengths (m): 64, 70, 162, 117, 165.

Thorax: Antepronotum with 6 lateral setae. Dorsocentrals 8, prealars 4. Scutellum with 8 setae.

Wing (Fig. 3): Anal lobe well developed. VR 1.06. R2+3 ends 1/3 distance between R1 and R4+5. Costa extension 34 m. Brachiolum without seta; R with 12 setae, remaining veins bare. End of Cu1 slightly recurved. Squama with 25 setae.

Legs: Spur of front tibia 70 m long, without denticles. Spurs of middle tibia 48 m long, of hind tibia 85 m. Hind tibial comb with 13 setae. Middle and hind tibial spurs with denticles. Two pseudospurs present on tarsi III of middle and hind legs ( Table 2 ):

Hypopygium (Fig. 4): Anal point short, 50 m long, 38 m wide at base, anal point length/width 1.32, with 4 lateral setae and 12 setae at base. Tergite IX bare, laterosternite IX with 9 setae. Phallapodeme hooked, 126 m long; transverse sternapodeme vaulted, without oral projection, 167 m long. Gonocoxite 315 m long. Gonostylus slightly arched, 116 m long. Inferior volsella with double layers, dorsal part naked, rounded and well sclerotized, ventral part with more than 20 basal setae. Crista dorsalis well developed. Megaseta 10 m long. HR 2.72, HV 3.66.

Female and immature stages: unknown.

Holotype: Male, P. R. CHINA: Sichuan Province, Daocheng County (29° 1 N, 100° 18 E), alt. 40–64 m, 20. IV 1988, sweep net, X. Wang, slide no. 11779.

Etymology: From Latin crista, ridge, referring to the well developed crista dorsalis on the gonostylus.

Distribution: The specimen was collected by sweep netting in a subtropical area in an oriental Chinese province.

Remarks: The prominent sclerotized, bare inferior volsella, combined with the absence of an oral projection on the sternapodeme; the short, broad anal point; and obvious crista dorsalis on the gonostylus separate P. cristatus sp. nov. from other known species of the genus.

Tables

TABLE 2. P. cristatus sp. nov. Lengths (m) and proportions of leg segments.

fe	ti	ta1	ta2	ta3	ta4	ta5	LR
P2 1180	1230	910	570	360	250	170	0.74
P2 1230	1130	600	390	270	180	140	0.53
P3 1330	1350	850	460	350	220	150	0.61