Dusungwua dichromella ( Ragonot, 1893 )

Ren, Yingdang, Yang, Linlin, Liu, Hongxia & Li, Houhun, 2020, Taxonomic review of the genus Dusungwua Kemal, Kizildağ & Koçak, 2020 (Lepidoptera: Pyralidae), with descriptions of six new species and propositions of synonyms, Zootaxa 4894 (3), pp. 341-365 : 348

Dusungwua dichromella ( Ragonot, 1893)

( Figs 1 , 5 , 16 , 27 )

Rhodophaea dichromella Ragonot, 1893: 75 . TL: Japan. TD: CNC.

Eurhodope dichromella: Shibuya, 1932: 331 .

Acrobasis dichromella: Roesler, 1985: 29 .

Trachycera dichromella: Roesler, 1987: 316 .

Furcata dichromella: Du, Sung & Wu, 2005: 101 .

Eurhodope pseudodichromella Yamanaka, 1980: 67 . Syn. nov.

Acrobasis pseudodichromella: Roesler, 1985: 29 .

Trachycera pseudodichromella: Roesler, 1987: 316 .

Eurhodope (Eurhophaea) pseudodichromella Yamanaka : Xu et al., 2005: 324.

Furcata pseudodichromella: Du, Sung & Wu, 2005: 102 .

Dusungwua dichromella: Kemal, Kizildağ & Koçak, 2020: 2 .

Diagnosis. Adult ( Fig. 5 ) with wingspan 18.0̅24.0 mm. This species can be recognized by the following characters: in the male genitalia ( Fig. 16 ), the uncus is tapered abruptly near middle from broad base, with rather narrow and tubular distal part, the gnathos is expanded in distal half and has a small bifid apex, postero-lateral lobe of the transtilla is digitate, form an acute angle of about 60°, and the phallus has an ovate spinose patch near apex; in the female genitalia ( Fig. 27 ), the antrum is rounded-triangular, the corpus bursae is elongate, 3.5 times as long as wide, and the signum situated at anterior 2/7 of the corpus bursae. It is superficially quite similar to D. paradichromella , but can be separated from the latter by the forewing diffused with much more white scales in median area, the uncus tapered abruptly near middle, the gnathos with distal half dilated in the male genitalia, and the signum situated at anterior 2/7 of the corpus bursae; in D. paradichromella , the forewing is mottled with less white scales in median area, the uncus is gradually narrowed, the gnathos is clubbed in the male genitalia, and the signum situated at posterior 2/5 of the corpus bursae in the female genitalia.

Material examined. 251 male and 86 female specimens in different localities of China are examined .

Distribution. China (Anhui, Beijing, Fujian, Gansu, Guangxi, Guizhou, Hebei, Henan, Hubei, Hunan, Jiangxi, Jilin, Liaoning, Shaanxi, Shandong, Sichuan, Tianjin, Zhejiang), Japan.

Discussion. Variations occur in both male and female genitalia. In the male genitalia ( Fig. 16 a-d), the distal narrow part of the uncus varies from 1/3 to 1/2 of the total length; the distal half of the gnathos is expanded to varying degrees; postero-lateral lobes of the transtilla form an acute angle of 45° to 60°, shallowly or deeply within individuals. In the female genitalia, the corpus bursae varies in shape: it is usually elongate, slightly widening toward anterior margin; in some species, the distal 1/3 is wider or dilated subroundly ( Fig. 27a ).

Yamanaka (1980) described D. pseudodichromella ( Yamanaka, 1980) from Japan. Yamanaka stated that D. pseudodichromella differed from D. dichromella in the antemedian line of the forewing more gently curved, the postero-lateral lobes of the transtilla are narrower and more deeply concave in between. We regard these as variations within species. Hence, we treat D. pseudodichromella as a synonym of D. dichromella .

Figures

FIGURE 1. Distribution of Dusungwua in China ● D. antennalveata sp. nov.; ♣ D. basinigra sp. nov.; ■ D. dichromella; ♠ D. fascecornuta sp. nov.; ♥ D. karenkolla; ▼D. ohkunii; ▲D. paradichromella; ☆ D. paripalpa sp. nov.; ♦ D. quadrangula; Ǫ D. similiquadrangula sp. nov.; □ D. strictivinculum sp. nov.

FIGURE 16. Male genitalia of Dusungwua dichromella, slide No. RYD04832. 16a–d, variations, slide Nos.: a, LJY11373; b. DYL00553; c, LHX14151; d, RYD04629 (Scale bar = 0.5 mm).

FIGURES 3–6. Adults of Dusungwua spp. 3, D. antennalveata sp. nov., holotype, ♂; 4, D. basinigra sp. nov., holotype, ♂; 5, D. dichromella, ♂; 6, D. fascecornuta sp. nov., paratype, ♂ (Scale bars: 3–6 = 5 mm; 3a–6a = 0.5 mm).

FIGURES 25–31. Female genitalia of Dusungwua spp. 25, D. antennalveata sp. nov., paratype, slide No. RYD04332; 26, D. basinigra sp. nov., paratype, slide No. RYD04365; 27, D. dichromella, slide No. LHX14152, 27a, slide No. RYD04817; 28, D. fascecornuta sp. nov., paratype, slide No. LHX14181; 29, D. karenkolla, slide No. LHX14180; 30, D. ohkunii, slide No. LJY09289; 31, D. paradichromella, slide No. RYD04822 (Scale bar = 0.5 mm).