Rivula guidiana sp. nov.

(Chinese name: 桂dz涓njď)

urn:lsid:zoobank.org:act: 4CACF4E3-FC70-42AC-B48C-A9A083F9CBD0

Figures 7, 8, 16

Type material. Holotype. male, China, Aut. Reg. Guangxi, Laibin City, Jinxiu County, Shuidi Village, 7–10 Jul. 2020, leg. K.L Wu, genit. prep. JYY-187-1, coll. NEFU. Paratypes. 2 males, China, Prov. Yunnan, Puer City, Jiangcheng, 15–17 Aug. 2008, leg. HL. Han, genit. prep. JYY-188-1, JYY-189-1, coll. NEFU.

Diagnosis. The new species is similar to R. curvifera in morphological characters (Figs. 9, 17), but it differs in the following characters (characters for R. curvifera are in parentheses):

Adult R. guidiana sp. nov. (Figs. 7, 8), the terminal area with a slender and long bar (a broad and short bar in curvifera); antemedial and median lines absent at costal margin (distinct in curvifera); terminal line region mixed pale (curvifera without terminal line); the subcostal margin bar nearly extends to apex (curvifera extends to apex).

In male genitalia of R. guidiana sp. nov. (Fig. 16), valva more paralleled by dorsal and ventral margin, and straight (curvifera upcurved); cucullus straight (cucullus rounded); sacculus with expansion at 1/3 (rather smooth in curvifera). Aedeagus of uniform thickness, tube-shaped, strongly sclerotized (slightly sclerotized and cone-shaped in curvifera); carinal plate sclerotized, without spines (absent in curvifera); vesica with 1 cornuti field on subbasal diverticulum, and densely covered small grains on median diverticulum (curvifera with 2 cornuti fields on subbasal and median diverticula, grains absent).

Description. Adult (Figs. 7, 8). Wingspan 15–16 mm. Head gray-brown; labial palpi yellowish-brown, upcurved and extended forward but not beyond the frontal tuft; antennae yellowish-brown and filiform. Thorax darker brown; patagium and tegula lighter. Abdomen brown-yellowish with yellowish scales. Forewing light gray-brown, costal margin brown; basal, antemedial and median lines more indistinct; postmedial line only distinct in costal margin area, and pale; subterminal line pale, incurved to median line, and forming a large spoon-shaped mark; the subcostal margin bar broad, pale, and extending to nearly the apex, with spoon-shaped mark forming a slender, long bar shape at cell terminal part; terminal line region pale, gradually widening from costal to inner margin. Hindwing lighter than forewing; the fringe grayer at inner margin; discal spot absent.

Male genitalia (Fig. 16). Uncus strongly sclerotized, hook-shaped, base wide and with a triangular opening, approximately of equal length to the tegument. Tegumen narrow and strongly sclerotized, same length as uncus. Vinculum narrow, broad V-shaped and strongly sclerotized. Saccus funnel-shaped. Juxta hill-shaped, with ear lobe on both sides. Valva more membranous, chair-shaped; cucullus straight; costa broader and longer than sacculus, and forming a small and narrow gap at basal part; sacculus bent at an obtuse angle at 1/3; clasper short and very small mastoid-shaped.Aedeagus tube-shaped, strongly sclerotized; carinal plate sclerotized, without spines; ceacum 1/3 times longer than aedeagus. Vesica membranous, with 1 subbasal diverticulum; and 6 median diverticula, 4th and 5th median diverticula densely covered with small grains; the subbasal diverticulum covered with a strongly sclerotized cornuti bar.

Female genitalia. Unknown.

Bionomics. The species was collected between June to August at altitudes ranging from 800 to 1200m. The collection site was located near a subtropical evergreen broadleaf forest with a plentiful number of shrubs (Fig. 22).

Distribution. China (Guangxi; Yunnan).

Etymology. This species name is a combination of two Chinese words, which refers to Aut. Reg. Guangxi (“Gui” for short in Chinese) and Yunnan Province (“Dian”). The name indicates the two provinces: Guangxi and Yunnan.