Ditrigona sinespina Jiang & Han, 2022

Guo, Xiao-Jiang, Cheng, Rui, Jiang, Shan, Xue, Da-Yong & Han, Hong-Xiang, 2022, Four new species of Ditrigona Moore (Lepidoptera, Drepanidae) in China and an annotated catalogue, ZooKeys 1091, pp. 57-98 : 57

19. Ditrigona sinespina Jiang & Han sp. nov.

Figs 19-20 , 64 , 98 , 131 , 163

Description.

Head. Antennae bipectinate, with proximal rami shorter than outer rami, the longest ramus about four times diameter of antennal shaft in male; rami quite short in female, almost equal to diameter of antennal shaft. Frons flattened, width less than diameter of compound eyes; white, upper half with a narrow pale brown transverse band. Labial palpus slender, not extending beyond frons, with outside brown, inner side whitish. Vertex white, pale brown anteriorly.

Thorax. Dorsal and ventral sides of thorax white. Tegula white. Hind tibia with two pairs of spurs in both sexes. Forewing length: ♂♀16 mm. Both fore- and hind wings white, transverse lines grey. Forewing with costa pale brown, distal half deeper. Subbasal and antemedial lines slightly bent inwards at middle and costa, the former narrower; postmedial line broad, almost straight; submarginal line double, the inner one slightly wavy and the outer one deeply wavy. Hind wing with antemedial line straight, merging into the elongate grey area along anal margin; postmedial line broader, almost straight, closing to submarginal line near anal angle, forming large pointed teeth on CuA2 and anal fold; submarginal line double, with the inner one nearly straight and only wavy near anal angle, the outer one wavy, the two lines gradually approximating towards anal margin. Anal margin less extended, possessing a quite short tail process, longer in female, with a small black patch. Fringes pale brown. Forewing underside with costa deep brown in basal half.

Abdomen. Dorsal and ventral sides of abdomen white. Eighth tergite large, nearly quadrate, with posterior margin shallowly concave; eighth sternite concave at middle, forming two small lateral blunt processes.

Male genitalia. Uncus bifurcate over its whole length, both halves short and very narrow. Socii large, rounded. Valva small, ventral margin smoothly curved, distal and posterior margins straight, forming a blunt angle; posterior protrusion rounded. Saccus blunt and rounded. Juxta indistinctly shaped. Aedeagus very stout, terminal part narrower; cornutus a large oval spinose patch.

Female genitalia. Papillae analis short; apophyses anteriores moderate, broad basally. Ostium bursae large; ductus bursae indiscernible; corpus bursae round, signum absent.

Diagnosis.

On the wing pattern, D. sinespina is close to D. tenuiata , but it can be differentiated by the larger distance between the two submarginal lines on the forewing, and the smaller tail process. Compared to D. triangularia and D. uniuncusa , the anal margin of D. sinespina is less extended, and the tail process is distinctly shorter than in those two species. Compared to D. parva sp. nov. and D. concava sp. nov., D. sinespina is larger (with forewing length 16 mm), and the tail process on the hind wing is less developed.

In the male genitalia, the slender uncus is similar to that of D. tenuiata and D. concava , but it is longer than in D. tenuiata and shorter than in D. concava . The straight distal margin of the valva is also different from these two species. The shape of the aedeagus, which is broad and blunt posteriorly, also can be distinguished from these two species. The eighth tergite of the male is similar to that of D. concava , but the eighth sternite is different: in D. sinespina it is narrowly and deeply concave, forming two blunt protrusions, while in D. concava it is widely and shallowly concave, forming two small lateral processes. The female genitalia of D. sinespina are also similar to those of D. tenuiata , but can be differentiated by the lack of a signum.

Type material.

Holotype, ♂, China: Yunnan (IZCAS): Yunlong, Tianchi, 2570 m, 9-12.VIII.2016, leg. Ban Xiaoshuang, slide no. Drep-1054, M33001. Paratypes: Yunnan (IZCAS), 1♂, same data as holotype, M33002, posterior part of abdomen missing; 1♂, same data as holotype, M33029; 1♀, Tengchong, Heinitang, 1824 m, 26-27.VI.2014, leg. Pan Xiaodan, slide no. Drep-1060, M33196.

Distribution.

China (Yunnan).

Etymology.

The species is named from the Latin words sine and spina, which refers to the lack of a signum in the female genitalia.

Molecular data.

The mean intraspecific distance of D. sinespina is 1.55% (min. 0%, max. 2.24%, n = 4). The nearest related species is D. tenuiata , with genetic distance 7.16%.

Figures

Figures 1 - 27. Adults of Ditrigona 1 D. derocina, male 2 D. diana, male 3 D. crystalla, holotype, male 4 D. spilota, male, ZFMK 5 D. furvicosta, male 6 D. jardanaria, male 7 D. media, paratype, male, ZFMK 8 D. sericea, male 9 D. sericea, male (Auzatella pentesticha Chu & Wang, allotype) 10 D. pentesticha, holotype, female 11 D. q. erminea, holotype, male, ZFMK 12 D. q. spodia, holotype, male, ZFMK 13 D. q. leucophaea, holotype, male, ZFMK 14 D. obliquilinea thibetaria, male 15 D. triangularia, lectotype, male 16 D. uniuncusa, male 17 D. tenuiata, holotype, male 18 D. regularis, male 19, 20 D. sinespina sp. nov., 19 holotype, male 20 paratype, female 21, 22 D. parva sp. nov., 21 holotype, male 22 paratype, female 23 D. concava sp. nov., holotype, male 24 D. titana, holotype, male, ZFMK 25 D. pomenaria male 26 D. polyobotaria, holotype, female, ZFMK 27 D. typhodes, male. Scale bar: 1 cm.

Figures 64 - 74. Male genitalia of Ditrigona 64 D. sinespina sp. nov., holotype 65 D. parva sp. nov., holotype 66 D. concava sp. nov., paratype 67 D. titana, ZFMK 68 D. pomenaria 69 D. typhodes 70 D. lineata lineata 71 D. artema 72 D. candida, paratype, ZFMK 73 D. chionea 74 D. fusca sp. nov., holotype. Scale bars: 1 mm.

Figures 90 - 106. Aedeagus of Ditrigona 90 D. sericea (Auzatella pentesticha Chu & Wang, allotype) 91 D. quinaria erminea, ZFMK 92 D. quinaria spodia 93 D. obliquilinea thibetaria 94 D. triangularia 95 D. uniuncusa 96 D. tenuiata, holotype 97 D. regularis 98 D. sinespina sp. nov., holotype 99 D. parva sp. nov., holotype 100 D. concava sp. nov., paratype 101 D. titana, ZFMK 102 D. pomenaria 103 D. typhodes 104 D. lineata lineata 105 D. artema 106 D. candida, ZFMK. Scale bars: 1 mm.

Figures 128 - 151. Eighth segment of Ditrigona 128 D. uniuncusa 129 D. tenuiata, holotype 130 D. regularis 131 D. sinespina sp. nov., holotype 132 D. parva sp. nov., holotype 133 D. concava, paratype 134 D. titana, ZFMK 135 D. pomenaria 136 D. typhodes 137 D. lineata lineata 138 D. artema 139 D. candida, ZFMK 140 D. chionea 141 D. fusca, sp. nov., holotype 142 D. conflexaria micronioides 143 D. margarita 144 D. berres 145 D. chama 146 D. platytes 147 D. clavata 148 - 151 D. cirruncata 148 from Shaanxi 149 - 150 from Emei Shan, Sichuan 151 from Zhejiang.

Figures 161 - 172. Female genitalia of Ditrigona 161 D. tenuiata, paratype 162 D. regularis 163 D. sinespina sp. nov., paratype 164 D. parva sp. nov., paratype 165 D. typhodes 166 D. lineata lineata 167 D. artema 168 D. candida, paratype, ZFMK 169 D. chionea 170 D. fusca sp. nov., paratype 171 D. conflexaria micronioides 172 D. margarita. Scale bars: 1 mm.