Chionea (Chionea) crassipes gracilistyla Alexander, 1936

Zhang, Xiao, Wang, Junchao & Yang, Ding, 2012, Chionea Dalman newly recorded from China with descriptions of two new species (Diptera, Limoniidae), Zootaxa 3316, pp. 1-14 : 3-4

Chionea (Chionea) crassipes gracilistyla Alexander, 1936

( Figs. 4–11 )

Chionea gracilistyla Alexander, 1936: 187 . Type locality: Chosen, Kyushu, Honshu ( Japan).

Diagnosis. Generally brownish yellow species. Antenna with 7 segments. Gonostylus with a sclerotized lobe at base; inner tooth of sclerotized lobe shorter than outer tooth. Aedeagus large and projecting beyond paramere.

Description. Male ( Fig. 4 ). Body length 4.0– 5.5 mm, wing length 0.2 mm.

Head ( Fig. 5 ). Brown with brownish yellow hairs. Frons darker and prominent. Antenna about 0.7 mm long. Scape pale brown with extreme tip pale yellow; pedicel pale brown with tip darker; fusion segment (first flagellomere) pale brown, flagellomeres 2–5 brownish yellow. Scape subcylindrical; pedicel club-shaped; fusion segment subconical, flagellomeres 2–4 subcylindrical with three long hairs each, last flagellomere short with two long apical hairs. Proboscis and palpus brown to brownish yellow with brownish yellow hairs.

Thorax ( Fig. 4 ). Pronotum and mesonotum brown with pale brownish yellow hairs. Coxae brownish yellow; trochanters darker; femora yellow; tibiae and tarsi brownish yellow. Hairs on legs brownish yellow ( Fig. 6 ). Wing white. Halter 0.4–0.5 mm long, white.

Abdomen ( Fig. 4 ). Tergites and sternites brownish yellow. Hairs on abdomen pale brownish yellow.

Genitalia ( Figs. 7–11 ). Posterior margin of tergite 9 with a broadly V-shaped median emargination. Gonocoxite elongate, with long hairs on both dorsal and ventral sides. Gonostylus smoothly curved with a blunt basal tooth on inner margin, which bears several hairs; tip of gonostylus with conspicuous tuft of microscopic hairs. Blackened sclerotized lobe present at base of gonostylus; sclerotized lobe bidentate, inner tooth of it shorter than outer tooth. Paramere incurved with tip blunt and rounded. Claspette apically rounded with fine, short dorsal hairs. Aedeagus large and projecting beyond paramere.

Female. Unknown.

Material examined. 5 males, China: Liaoning, Kuandian, Tianhuashan Mountain, 41°4ʹN 124°35ʹE, 2011. III. 5, Weihai Li; 4 males, China: Jilin, Erdaobaihe, 42°26ʹN 128°8ʹE, 2011. III. 8, Junchao Wang; 2 males, China: Heilongjiang, Wuying, Fenglin Nature Reserve, 48°8ʹN 129°12ʹE, 2011. XI. 12, Junchao Wang.

Distribution. China (Liaoning, Jilin, Heilongjiang); Russia, North Korea, South Korea, Japan ( Oosterbroek 2012).

Remarks. This species is recorded from China for the first time. For descriptions and illustrations of this species, also see Alexander (1936) and Narchuk (1998). C. gracilistyla Alexander, 1936 is listed as a synonym of C. crassipes Boheman, 1846 in Savchenko et al. (1992). However, Narchuk (1998) reinststed C. gracilistyla as a subspecies of C. crassipes . And described a new subspecies, C. (C.) crassipes magadanensis Narchuk, 1998 . The latter can be easily separated from the other two subspecies by claspette of aedeagal complex with one long hair and few fine, short hairs. In the other two subspecies, claspette of aedeagal complex only has few fine, short hairs. These two subspecies are similar, but C. (C.) crassipes gracilistyla Alexander, 1936 can be separated from C. (C.) crassipes crassipes Boheman, 1846 by the inner tooth of sclerotized lobe of gonostylus being shorter than the outer tooth ( Fig. 9 ), and the paramere with tip wide and blunt ( Fig. 7 , 11 ). In the nominotypical subspecies, inner tooth of sclerotized lobe of gonostylus is as long as outer tooth, and the tip of paramere is strongly narrowed ( Narchuk 1998).

Figures

FIGURES 4 – 7. Chionea (Chionea) crassipes gracilistyla Alexander, 1936. 4: Habitus of male, dorsal view; 5: Head of male, lateral view; 6: Leg of male; 7: Aedeagal complex, dorsal view. Scale bar: 4 = 1.0 mm; 5 = 0.3 mm; 6 = 1.0 mm; 7 = 0.2 mm.

FIGURES 8 – 11. Chionea (Chionea) crassipes gracilistyla Alexander, 1936. 8: Genitalia, dorsal view; 9: Genitalia, ventral view; 10: Genitalia, lateral view; 11: Aedeagal complex, dorsal view. Scale bar: 8 – 10 = 0.25 mm; 11 = 0.2 mm.