Cryptotendipes casuarius (Townes)

Yan, Chuncai, Tang, Hongqu & Wang, Xinhua, 2005, A review of the genus Cryptotendipes Lenz (Diptera: Chironomidae) from China, Zootaxa 1086, pp. 1-24 : 2-4

Cryptotendipes casuarius (Townes) ( Fig. 1 A–C)

Harnischia (Harnischia) casuaria Townes, 1945: 162 .

Cryptotendipes casuarius ( Townes, 1945) Saether 1977: 96 , Wang et al. 1989: 33, Wang 2000: 643. nec Cryptotendipes casuarius (Townes) sensu Beck & Beck 1969: 295 (= C. emorsus (Townes)) .

Material examined: 1 male, China: Shandong Province, Muping County, Kunyu Mountain, Dianhou, 25.VIII.1987, H. Li.

Diagnostic characters: The species can be distinguished from other species by having a high ridge on tergite IX and the inner margin of the gonostylus with a distinct concavity on the apical half.

Male imago (n = 1)

Total length 2.78 mm. Wing length 1.47 mm. Total length/wing length 1.89. Wing length/profemur length 2.45.

Coloration: Thorax dark brown, scutellum and dorsum of scutum light yellow, postnotum blackish brown. Abdomen dark brown, tergite IX and hypopygium light yellow. Femora and tibiae of front legs yellowish brown, tarsi dark brown, tarsi V of mid and hind legs dark brown, remainder of mid and hind legs yellowish brown.

Head: AR 1.94. Ultimate flagellomere 600 µm long. Frontal tubercles cylindrical, 12 µm long, 7 µm wide. Temporal setae 9, including 4 outer verticals and 5 postorbitals. Clypeus with 12 setae. Tentorium 123 µm long, 32 µm wide. Palpomere lengths (in µm): 38, 38, 88, 110, 148. Palp segments 5th/3rd 1.68.

Thorax: Antepronotals with 1 seta, acrostichals 2, dorsocentrals 8, prealars 3. Scutellum with 4 setae.

Wing ( Fig. 1 A): VR 1.20. R with 1 seta, R1 bare, R4+5 with 2 setae at apex. Brachiolum with 2 setae. Squama with 4 setae. Anal lobe well developed.

Legs: Front tibia with 2 subapical setae, 86 µm and 88 µm long, spurs of middle tibia 17– 8 µm long, comb with 15 teeth, 10 µm long; spurs of hind tibia 20–22 µm long, comb with 23 teeth, 10 µm long. Tarsus 1 of mid leg with 9 sensilla chaetica on distal 1/2. Lengths (in µm) and proportions of legs as in Table 1 .

Hypopygium ( Fig. 1 B, C): Anal point 45 µm long, 5 µm wide at base, 8 µm wide at apex, constricted slightly at base, rounded at apex, without lateral setae. Tergite IX with distinct high ridge with microtrichia, 17 setae on triangular margin. Laterosternite IX with 2 setae. Anal tergite bands V­shaped, medially separate. Phallapodeme 75 µm long. Transverse sternapodeme 34 µm long. Superior volsella rod­like with 2 short apical setae and microtrichia. Gonocoxite 83 µm long. Gonostylus 130 µm long, widest at about basal 1/3, concave at about apical 1/3, with 14 setae on inner margin. HR 0.64; HV 2.14.

Remarks: In Chinese specimens, the median projection of the gonostylus is not as obvious as in the Nearctic specimens.

Distribution: The species has a wide distribution in the Nearctic Region. It also occurs in Palaearctic China.

Figures

FIGURE 1. Cryptotendipes casuarius (Townes, 1945), Chinese specimen. A. Wing. B. Dorsal view of hypopygium. C. Ventral view of hypopygium.

Tables

TABLE 1. Lengths (µm) and proportion of legs of Cryptotendipes casuarius (Townes), male (n = 1).

fe	ti	ta1	ta2	ta3	ta4	ta5	LR
p1 600	400	690	350	260	180	100	1.73
p2 550	450	235	150	110	75	65	0.52
p3 610	590	360	230	200	110	80	0.61