Bradina spirella Guo & Du, 2023

Guo, Jia-Ming & Du, Xi-Cui, 2023, Five new species of Bradina Lederer (Lepidoptera, Crambidae) from China, with remarks on the morphology of the genus, ZooKeys 1158, pp. 49-67 : 49

Bradina spirella Guo & Du sp. nov.

Figs 2C , 3L-P

Type material.

Holotype, ♂ China: Hunan Prov., Xianchijie, Wuyunjie National Nature Reserve, alt. 720 m, 28°90'N, 111°48'E, 24 June 2019, Ying Yang leg., genitalia slide no. GJM21161. Paratypes. China: Hunan Prov., 9 ♂♂, 4 ♀♀, Bamian Mountain Nature Reserve, Guidong County, alt. 973 m, 16 June 2015, Kai Chen leg., genitalia slide no.: GJM21160 ♂; 5 ♂♂, 2 ♀♀, Zhushan Village, Wuyunjie National Nature Reserve, alt. 100 m, 15 June 2019, Ying Yang leg.; 34 ♂♂, 14 ♀♀, Jindongjie, Wuyunjie National Nature Reserve, alt. 178 m, 16-19 June 2019, Ying Yang leg.; 66 ♂♂, 22 ♂♂, 18-24 June 2019, other same data as holotype, genitalia slide no.: GJM21048 ♂, GJM21049 ♂, GJM21162 ♂, GJM21163 ♂, GJM21164 ♀; Jiangxi Prov., 4 ♂♂, 2 ♀♀, Jinggang Mountain, 30 June 2011, Jin-Wei Li leg., genitalia slide no.: GJM21159 ♂, GJM21183 ♀.

Diagnosis.

This species is similar to B. megesalis . The difference in appearance is that wings of this species are darker in color and hindwings are slightly broader; the postmedial line and terminal margin of forewing are obviously unparallel in this species, while nearly parallel in the latter. It also can be distinguished by phallus with one short, spiral band-like cornutus and two lamellar cornuti, and some tiny spines on the vesica medially; the posterior ductus bursae is inflated into a thick finger-like protrusion. In B. megesalis , the phallus has two spear-like cornuti and is without spines on the vesica; the posterior ductus bursae is inflated into an irregular protrusion.

Description.

Adult (Fig. 2C ). Wingspan 29.0-32.0 mm, forewing length 14.0-15.5 mm. Frons brown, with lateral sides yellowish white above. Vertex pale yellow. Antenna brownish yellow, with black-brown ring dorsally, basal segments of flagellum black-brown dorsally; ventral cilia c. one third length of flagellomere diameter of male. Labial palpus with basal two thirds white, black-brown distally. Maxillary palpus black-brown. Patagium and tegula dark brown. Thorax dark brown dorsally, white ventrally. Wings dark brown, stigmata and lines black-brown. Forewing black-brown along costa, slightly paler distally; orbicular stigma very small; discoidal stigma crescent; postmedial line at c. two thirds of wing, inconspicuously waved and unparallel to terminal margin. Hindwing pale at base; postmedial line straight, only middle part obvious. Cilia greyish brown. Legs pale yellow. Front and middle tibiae dark brown; hind tibia with outer middle spurs c. same length as inner spurs. Abdomen brown dorsally, with each segment pale terminally; yellowish white ventrally.

Male genitalia (Fig. 3L, M ). Valva with the distal part gradually narrowed and bearing dense long setae; costa arched near middle and accompanied by a cluster of long curved setae; sacculus gradually narrowed to apex, with a cluster of long setae near middle. Juxta narrowed distally. Phallus with one short and spiral band-like cornutus tapered at posterior end, along with two lamellar cornuti in posterior half; some tiny spines on vesica medially.

Female genitalia (Fig. 3N-P ). Antrum broad. Ductus bursae slender, posteriorly inflated into a thick finger-like protrusion, adjoined posteriorly by colliculum. Corpus bursae nearly oval, without spines inside, transverse signum crescent and densely spinose.

Etymology.

The specific name is derived from the Latin spirellus (meaning 'small spiral-like’), in reference to a short and spiral band-like cornutus.

Distribution.

China (Hunan, Jiangxi).

Remark.

Coremata of some male individuals of this species were protruded out of the body, forming a cluster of white hairs at the end of the abdomen.

Figures

Figure 2. Habitus of Bradina species, male A B. megesalis B B. fusoidea sp. nov., holotype C B. spirella sp. nov., holotype D B. torsiva sp. nov., holotype E B. subpurpurescens F B. falciculata sp. nov., holotype G B. translinealis H B. ternifolia sp. nov., holotype. Scale bars: 0.5 cm.

Figure 3. Genitalia of Bradina species A-E B. megesalis A, B male, slide no. GJM 21074 C-E female, slide no. GJM 21080 F-K B. fusoidea sp. nov. F-H male holotype, slide no. GJM 21117 I-K female, paratype, slide no. GJM 21118 L-P B. spirella sp. nov. L, M male, holotype, slide no. GJM 21161 N-P female, paratype, slide no. GJM 21164 B, G, H, M partial enlargement of phallus D, J, O partial enlargement of ductus bursae E, K, P signum. Scale bars: 0.2 mm (E, G, K, P); 0.5 mm (A, B, D, F, H, J, L, M, O); 1.0 mm (C, I, N).