Nokona cucphuongae O. Gorbunov et Arita, 2020

Gorbunov, O. G. & Arita, Yu., 2020, Two new species of the genus Nokona Matsumura, 1931 (Lepidoptera: Sessiidae) from Vietnam, Far Eastern Entomologist 412, pp. 1-12 : 6-11

Nokona cucphuongae O. Gorbunov et Arita , sp. n.

http://zoobank.org/NomenclaturalActs/ 0E528F24-367C-4C13-AA6C-13CD5DC206D8

Figs 7–12

MATERIAL. Holotype – ♂ with labels: “ Vietnam / Ninh Binh Prov., / Gia

Vien / Cuc Phuong, N.P. / 1. VI.2016 / Y. Arita legit”; “ SESIIDAE / Pictures No /

0163-0164–2018 / Photo by O. Gorbunov”; “Genitalia examined / by O. Gorbunov /

Preparation No / OG–030-2018”; “ HOLOTYPUS ♂ / Nokona cucphuongae / O.

Gorbunov et Arita, 2020 / O. Gorbunov des., 2018” ( NSMT).

DESCRIPTION. Male (holotype) ( Figs 7, 8 ). Alar expanse 28.4 mm; body length

17.7 mm; forewing 12.2 mm; antenna 7.8 mm.

Head with antenna and scapus dark brown to black with dark blue-violet sheen;

frons dark gray with bronze-purple sheen and a white stripe laterally; basal joint of labial palpus dark brown to black with greenish sheen and pale yellow scales ventro-

basally, remain joints dark brown to black with greenish sheen exterior-dorsally and yellow to pale yellow interior-ventrally; vertex black with bright greenishanthracite sheen; pericephalic hairs yellow to pale yellow.

Thorax with patagia dark brown to black with violet sheen and a small yellow spot laterally; tegula dark brown to black with bronze-violet sheen and two small yellow spots anteriorly and at base of forewing; mesothorax dark brown to black with bronze-violet sheen and a small yellow spot posterior-laterally; metathorax dark brown to black with greenish sheen and a few yellow scales distally; thorax laterally dark brown to black with blue-violet sheen and a few pale yellow scales at base of forewing; posteriorly both metepimeron and metameron dark gray-brown with violet sheen and with long white and black hair-like scales.

Legs with neck plate mixed with white, dark gray and yellow scales; fore coxa dark brown to black with bluish sheen and a narrow pale yellow to white exterior margin; fore femur dark brown to black with blue-violet sheen, with a few yellow scales on dorsal margin and with elongate scales forming a tuft on ventral margin;

fore tibia dark brown to black with blue-violet sheen; fore tarsus ochreous; mid coxa dark gray with greenish-bronze sheen and a few whitish scales distally; mid femur dark brown to black with blue-violet sheen and a broad yellow dorsal margin; mid tibia dark brown to black with blue-violet sheen and a few pale yellow scales medio-dorsally; spurs dark ochreous to whitish; mid tarsus dark gray-brown with greenish sheen with a dense admixture of ochreous scales interior-ventrally on two basal tarsomeres; hind coxa dark gray with greenish-bronze sheen and a few whitish scales proximally; hind femur dark brown to black with blue-violet sheen and a narrow white ventral margin; hind tibia dark brown to black with blue-violet sheen and a dense admixture of pale yellow to white scales interior ventrally from base to base of mid spurs; spurs ochreous with a few dark gray-brown scales externally on distal spurs; hind tarsus dark gray-brown with greenish sheen with a dense admixture of ochreous scales interior-ventrally on two basal tarsomeres.

Forewing dorsally black with a few yellow scales with golden sheen at base; all opaque parts dark brown to black with strong dark violet sheen; transparent areas poorly developed; external transparent area undeveloped; anterior and posterior transparent areas small covered with translucent with electric-blue lustre and a few dark brown scales; ventrally opaque parts dark brown to black with dark blue-violet sheen; cilia dark brown with dark blue sheen.

Hindwing transparent; veins, discal spot and outer margin dark brown to black with dark greenish sheen; discal spot broad with parallel margins, reaching to vein M 3;

outer margin narrow, about as broad as cilia; cilia dark brown with dark blue sheen.

pictures No 0163-0164–2018), alar expanse 22.8 mm; 8 – ditto, underside.

Abdomen dorsally dark brown to black with greenish-violet sheen; tergites 2, 4

and 5 each with a few yellow scales distally; ventrally dark brown to black with dark violet sheen; sternites 1+2–5 each with a narrow pale yellow to white stripe distally; anal tuft poorly developed, dark brown to black with greenish-violet sheen and an admixture of whitish scales laterally.

MALE GENITALIA (holotype, genital preparation No OG –030-2018) ( Figs 9–

12). Uncus narrow, visibly broadened medially, covered with short setae dorsally;

tegumen small; gnathos somewhat broader than tegumen, with two strong beak-

shaped projections; tuba analis with subscaphium narrowly sclerotized ( Fig. 9 );

valva ( Fig. 10 ) triangular-oval, covered with hand-shaped setae at dorsal margin in basal half, short simple setae at both distal and dorsal margins; medial row of handshaped setae bears only a few narrow satae; crista sacculi low, densely covered with strong pointed setae; saccus ( Fig. 11 ) about as long as vinculum, thin, somewhat broadened subbasally; aedeagus ( Fig. 12 ) rather narrow, slightly longer than valva,

with a small well-sclerotized carina penis; vesica with numerous minute flat cornuti.

FEMALE. Unknown.

DIFFERENTIAL DIAGNOSIS. By the structure of male genitalia this new species belongs to N. regalis species-group and superficially it to be the closest to

N. sulawesiensis O. Gorbunov et Arita, 2015 (type locality: Indonesia: S. Sulawesi,

Bantimurung), N. poecilocephala (Diakonoff, 1968 [“1967”] ( Philippines: Luzon,

Los Baños), N. mahawu O. Gorbunov, 2016 ( Indonesia: N. Sulawesi, Kakasken

Dua) and N. christineae Fischer, 2003 (type locality: Malaysia: Cameron Highlands ,

Ringlet).

From N. sulawesiensis , N. cucphuongae sp. n. can be distinguished by the colouration of the scapus (yellow to pale yellow with a few black scales ventrally in the species compared, vs. dark brown to black with dark blue-violet sheen in the new species), frons (pale yellow with golden sheen, with a large gray spot with bronze sheen medially in N. sulawesiensis , vs. dark gray with bronze-purple sheen and a white stripe laterally in N. cucphuongae sp. n.), fore coxa (black with green-violet sheen and broadly yellow to yellow-orange basally in N. sulawesiensis , vs. dark brown to black with bluish sheen and a narrow pale yellow to white exterior margin

N. cucphuongae sp. n.), discal spot of the hindwing (discal spot dark brown mixed with brick-orange scales in the species compared, vs. dark brown to black with dark greenish sheen in N. cucphuongae sp. n.), and abdomen (dorsally entirely black with strong blue-violet sheen; ventrally dark brown to black with dark blue sheen N.

sulawesiensis, vs. dorsally dark brown to black with greenish-violet sheen; tergites

2, 4 and 5 each with a few yellow scales distally; ventrally dark brown to black with dark violet sheen; sternites 1+2–5 each with a narrow pale yellow to white stripe distally in N. cucphuongae sp. n.; compare Figs 7 and 8 with figs 1 and 2 in Gorbunov

& Arita, 2015: 3). Beside this, these two species have some differences in the male genitalia ( Figs 9–12 vs. figs 3–6 in Gorbunov & Arita, 2015: 5).

From the second species compared, new species differs by the colouration of the vertex (bright orange mixed with black in N. poecilocephala , vs. black with bright greenish-anthracite sheen in N. cucphuongae sp. n.), forewing dorsally (with strong indigo-green sheen in the species compared, vs. with strong dark violet sheen in N.

cucphuongae sp. n.), abdomen dorsally (each tergite with a narrow yellow stripe distally in N. poecilocephala , vs. tergites 2, 4 and 5 each with a few yellow scales distally in the new species), and by the conformation of the male genitalia, especially by the shape of the valva ( Figs 9–12 vs. fig. 349 in Diakonoff, 1967: 384).

preparation No OG–030-2018): 9 – tegumen-uncus complex; 10 – valva; 11 – saccus; 12 –

aedeagus. Scale bar: 0.5 mm.

From N. mahawu , N. cucphuongae sp. n. is separable by the colouration of the fore coxa (black with green-violet sheen, with a small white spot with golden sheen interior-basally N. mahawu , vs. dark brown to black with bluish sheen and a narrow pale yellow to white exterior margin in the new species), forewing ventrally (with brick-orange scales medially in N. mahawu , vs. without any orange or brick-orange scales in N. cucphuongae sp. n.), discal spot of the hindwing (light brown in N.

mahawu, vs. dark brown to black with dark greenish sheen in the new species), and abdomen (dorsally black with green-violet sheen; tergite 2 with a narrow yellow stripe distally; tergites 1 and 4 each with a few yellow scales distally; ventrally dark brown to black with bronze sheen, medially covered with individual yellow scales;

sternites 1+2, 3–6 with a narrow yellow stripe distally, sternite 7 with a few yellow scales distally in N. mahawu , vs. dorsally dark brown to black with greenish-violet sheen; tergites 2, 4 and 5 each with a few yellow scales distally; ventrally dark brown to black with dark violet sheen; sternites 1+2–5 each with a narrow pale yellow to white stripe distally in N. cucphuongae sp. n.; compare Figs 7 and 8 with figs 4 and 5 in Gorbunov, 2016: 163). In addition, there are some visible differences between these two species in the male genitalia ( Figs 9–12 vs. figs 6–9 in Gorbunov,

2016: 164).

From N. christineae , N. cucphuongae sp. n. easily differs by the colouration of the abdomen (tergite 4 with a narrow light red stripe distally, all sternites with a narrow yellow stripe distally in N. christineae , vs. tergites 2, 4 and 5 each with a few yellow scales distally, sternites 1+2–5 each with a narrow pale yellow to white stripe distally in N. cucphuongae sp. n.; Fig. 1 vs. fig. 1 in Fischer, 2003: 141) and by the shape of the valve in the male genitalia (compare Fig. 10 with fig. 3 in

Fischer, 2003: 140).

N. cucphuongae sp. n. is distinguishable from all other congeners in combinations of colouring of various parts of the body and wings and in the structure of the male genitalia.

BIONOMICS. The larval host plant is unknown. The holotype was collected in the beginning of June.

HABITAT. The male was collected on the edge of the rainforest.

DISTRIBUTION. The new species is known only from the type locality in the

Cuc Phuong National Park in North Vietnam (Ninh Binh Province).

ETHYMOLOGY. This new species is named after a very famous place with a great diversity of Sesiidae in North Vietnam.

Figures

Figs 7–8. Nokona cucphuongae O. Gorbunov et Arita, sp. n.: 7 – holotype ♂ (Sesiidae

Figs 9–12. Male genitalia of Nokona cucphuongae O. Gorbunov et Arita, sp. n. (genital

Figs 1–2. Nokona vietnamica O. Gorbunov et Arita, sp. n.: 1 – holotype ♂ (Sesiidae