Bembecia (s. str.) yakovlevi O. Gorbunov, 2023

Gorbunov, O. G., 2023, Two new species of the genus Bembecia Hübner, 1819 [“ 1816 ”] (Lepidoptera: Sesiidae) from Western Mongolia, Russian Entomological Journal 32 (2), pp. 198-206 : 202-206

Bembecia (s. str.) yakovlevi O. Gorbunov , sp.n.

Figs 3–4 , 10–14 , 16

MATERIAL. Holotype ♂ ( Figs 3–4 ) with labels: “ Mongolia, Gobi-Altai Aimag, / Hara Adzragyn-Nuruu Mts. , / 1800 m, 45°52´N, 095°30´E, / 15–16.VII.2010, / R. Yakovlev & E. Guskova leg.”; “ SESIIDAE / Pictures Nos / 0027-0028–2023 / Photo by O. Gorbunov ”; “Genitalia examined / by O. Gorbunov / Preparation No OG–009-2023”; “ HOLOTYPUS ♂ / Bembecia yakovlevi / O. Gorbunov, 2023 / O. Gorbunov des., 2022”.

DESCRIPTION. Male (holotype) ( Figs 3–4 ). Alar expanse 21.4 mm; body length 12.5 mm; forewing length 10.0 mm; antenna length 6.3 mm.

Head: antenna completely black with dark greenish shine; frons black with dark blue shine and small yellow spot medially; labial palpus with long hair-like scales ventrally, yellow interior-dorsally and black exterior-ventrally; vertex black with dark violet shine, densely covered with white, long, hair-like scales; occipital fringe black; neck plate black with dark greenish shine and few yellow scales laterally.

Thorax: patagia black with bright violet shine; tegula black with dark blue-violet shine and few yellow scales at base of forewing; both meso- and metathorax black with dark blue-violet shine; besides this, tegula, meso- and metathorax densely covered with white, long, hair-like scales; thorax laterally dark gray-brown with bright greenish-violet shine and few yellow scales medially; both metepimeron and metameron posteriorly black with dark violet shine densely covered with white, long, hair-like scales.

Legs: fore coxa black with greenish-violet shine; fore femur black with bronze-violet shine, few yellowish scales at anterior margin and black, long, hairy-like scales at posterior margin; fore tibia pale yellow ventrally and black with admixture of dark yellow scales at margins; fore tarsus completely yellow with golden shine; mid coxa black with greenish-violet shine; mid femur black with greenish-violet shine and white, long, hairy-like scales at posterior margin; mid tibia black with greenish-violet shine, dark yellow, elongated, oblique spot exterior medially and few dark yellow scales exterior-distally; spurs yellow with golden shine; mid tarsus yellow with golden shine and admixture of black scales with greenish-violet shine exterior-dorsally on basal tarsomere; hind coxa black with greenish-violet shine; hind femur black with greenish-violet shine and white, long, hairy-like scales at posterior margin; hind tibia yellow with golden shine and black scales with greenish-violet shine both basally and distally; spurs yellow with golden shine; hind tarsus completely yellow with golden shine.

Forewing dorsally with basal part black with anthracitic shine; costal margin up to tip of vein R 3 black with dark greenish shine and yellow narrow stripe between veins Sc and R-stem; CuA-stem dark brown with dark greenish shine and admixture of few yellow scales; anal margin yellow with few dark brown scales; discal spot trapeziform, black with dark greenish-violet shine and yellow distal half; veins R 4, R 5 and M 3 dark brown with admixture of yellow scales basally; veins M 1 and M 2 yellow with dark brown scales distally; surfaces between veins R 3 –R 5 yellow; apical area dark brown with bronze-violet shine, narrow, about as narrow as cilia; ventrally forewing yellow with black scales on basal part of discal spot and dark brown with bronze shine apical area; transparent areas well-developed, densely covered with translucent scales with light golden hue; posterior transparent area short but reaching level of discal spot of hindwing; external transparent area large, rounded, divided into four cells between veins R 5 and CuA 1, level to vein M 2 about three times as broad as discal spot and about 4.3 times as broad as apical area; cilia dark brown with bronze shine.

Hindwing transparent; costal margin, discal spot and vein M 1, CuP and CuA-stem yellow; veins M 3, CuA 1, CuA 2 and 1A dark brown with bronze shine; outer margin dark brown with bronze shine, annally very narrow and yellow; discal spot cuneiform, reaching base of common stem M 3 –CuA 1; outer margin narrow, about 0.5 times as broad as cilia; cilia dark brown with bronze shine.

Abdomen black with dark violet shine; tergite 2 with a row of yellow scales distally; tergites 4, 6 and 7 each with broad yellow stripe distally; ventrally sternite 4 yellow; sternites 5–7 each with broad yellow stripe distally; anal tuft well-developed, dorsally black with dark violet shine, admixture of yellow scales medially and yellow ventrally.

Male genitalia (paratype; genital preparation No OG– 009-2023) ( Figs 10–14 ). Tegumen-uncus complex relatively broad; scopula androconialis well-developed, about 0.5 times as long as tegumen-uncus complex ( Fig. 10 ); crista gnathi medialis long and broad; crista gnathi lateralis subcordiform, about half as long as and about as broad as crista gnathi medialis ( Fig. 10 ); valva ( Fig. 11 ) trapeziform-ovoid, crista sacculi oblique, dual, covered with apically pointed setae anteriorly and flat-topped ones posteriorly; caudal part of row of setae bent towards ventral margin; saccus ( Fig. 12 ) relatively broad, long, about twice as long as vinculum; phallus ( Fig. 13 ) rather broad, straight, slightly shorter than valva; vesica with numerous small cornuti ( Fig. 14 ).

Female. Unknown.

INDIVIDUAL VARIABILITY. Unknown.

DIFFERENTIAL DIAGNOSIS. By the shape of the crista sacculi of the male genitalia, this new species seems to be close to B. sareptana (Bartel, 1912) (type locality: Russia, Volgograd, Sarepta), B. auricaudata (Bartel, 1912) ( Kazakhstan: Ili River district) and B. aktashica O. Gorbunov, 2018 (type locality: Russia: Altai Mts, Aktash).

From B. sareptana , B. yakovlevi sp.n. differs in the colouration of the thorax laterally (dark brown to black with greenish-violet sheen in B. sareptana , vs. dark gray-brown with bright greenish-violet shine and few yellow scales medially in the new species), forewing dorsally (basal part black with blue-violet sheen; costal margin up to tip of vein R 3 dark brown to black with greenish-bronze sheen; CuA-stem dark brown with greenish-bronze sheen and few orange scales; anal margin orange with a few black scales with greenish-violet sheen; discal spot dark brown to black with dark violet sheen and orange distal third; veins R 4, R 5 and M 1 –M 3 orange with admixture of black scales with violet sheen distally; apical area orange with narrow brown to dark brown with violet sheen outer margin in the species compared, vs. basal part black with anthracitic shine; costal margin up to tip of vein R 3 black with dark greenish shine and yellow narrow stripe between veins Sc and R-stem; CuA-stem dark brown with dark greenish shine and admixture of few yellow scales; anal margin yellow with few dark brown scales; discal spot black with dark greenish-violet shine and yellow distal half; veins R 4, R 5 and M 3 dark brown with admixture of yellow scales basally; veins M

1

and M

2

yellow with dark brown scales distally; surfaces between veins R 3 –R 5 yellow; apical area dark brown with bronze-violet shine in B. yakovlevi sp.n.; cp. Figs 3–4 in this article with figs 31–36 in Gorbunov, 2018 or figs 1–6 in Gorbunov, 2020) and abdomen (dorsally black with dark violet sheen; tergites 2, 4, 6 and 7 each with narrow yellow stripe distally; ventrally black with greenish sheen; sternite 1+2 with small yellow spot lateraldistally; sternites 4 and 7 each with broad yellow stripe distally; anal tuft dorsally black with greenish sheen and few yellow scales medially at base, ventrally pale yellow to yellow-orange in the species compared, vs. black with dark violet shine; tergite 2 with a row of yellow scales distally; tergites 4, 6 and 7 each with broad yellow stripe distally; ventrally sternite 4 yellow; sternites 5–7 each with broad yellow stripe distally; anal tuft dorsally black with dark violet shine, admixture of yellow scales medially and yellow ventrally in B. yakovlevi sp.n.; cp. Figs 3–4 in this article with figs 31–36 in Gorbunov, 2018 or figs 1–6 in Gorbunov, 2020). In addition, these two species have some differences in the male genitalia, compare Figs 10–14 in this article with figs 48–52 in Gorbunov, 2018 or figs 11–15 in Gorbunov, 2020).

From B. auricaudata , B. yakovlevi sp.n. can be distinguished in the colouration of the frons (completely pale yellow in B. auricaudata , vs. black with dark blue shine and small yellow spot medially in the new species), patagia (black with greenish shine and large pale yellow spot laterally in B. auricaudata , vs. completely black with bright violet shine in B. yakovlevi sp.n.), hind tibia (yellow and narrowly black with bluish shine basally in the species compared, vs. yellow with golden shine and black scales with greenish-violet shine both basally and distally B. yakovlevi sp.n.), forewing dorsally (basally black with greenish-blue shine; costal margin dark brown with greenish shine and narrow orange stripe between veins Sc and R-stem; Cu-stem dark brown with greenish shine and orange basally; anal margin orange; discal spot black with dark blue shine basally and orange distally; veins within external transparent area and apical area orange in B. auricaudata , vs. basal part black with anthracitic shine; costal margin up to tip of vein R 3 black with dark greenish shine and yellow narrow stripe between veins Sc and R-stem; CuA-stem dark brown with dark greenish shine and admixture of few yellow scales; anal margin yellow with few dark brown scales; discal spot black with dark greenish-violet shine and yellow distal half; veins R 4, R 5 and M 3 dark brown with admixture of yellow scales basally; veins M 1 and M 2 yellow with dark brown scales distally; surfaces between veins R 3 –R 5 yellow; apical area dark brown with bronze-violet shine in B. yakovlevi sp.n.) and abdomen (dark brown to black with greenish shine; tergites 2 and 6 each with narrow pale yellow to white stripe distally; tergites 4 and 7 each with broad pale yellow stripe distally; tergites 3 and 5 each with admixture of pale yellow scales distally; ventrally sternites 1+2 and 4 each yellow; sternites 5–7 each mixed with yellow pale orange and dark brown scales in the species compared, vs. black with dark violet shine; tergite 2 with a row of yellow scales distally; tergites 4, 6 and 7 each with broad yellow stripe distally; ventrally sternite 4 yellow; sternites 5–7 each with broad yellow stripe distally in the new species).

From B. aktashica , B. yakovlevi sp.n. is clearly separable in the colouration of the frons (black with greenish-violet sheen in B. aktashica , vs. black with dark blue shine and small yellow spot medially in tha new species), forewing dorsally (basal part black with strong greenish-blue sheen; costal margin up to tip of vein R 4 dark brown to black with dark greenish-blue sheen; anal margin orange with few dark brown scales with dark violet sheen; CuA-stem dark brown to black with dark greenish-violet sheen cranially and orange anally; discal spot dark brown to black with strong violet sheen and large orange spot distally; veins R 5 and M 3 dark brown to black distally and orange proximally, veins M 1 and M 2 orange with dark brown to black tips; apical area orange with narrow dark brown outer margin with bronze sheen in the species compared, vs. basal part black with anthracitic shine; costal margin up to tip of vein R 3 black with dark greenish shine and yellow narrow stripe between veins Sc and R-stem; CuA-stem dark brown with dark greenish shine and admixture of few yellow scales; anal margin yellow with few dark brown scales; discal spot black with dark greenish-violet shine and yellow distal half; veins R 4, R 5 and M 3 dark brown with admixture of yellow scales basally; veins M 1 and M 2 yellow with dark brown scales distally; surfaces between veins R 3 –R 5 yellow; apical area dark brown with bronze-violet shine in B. yakovlevi sp.n.; cp. Figs 3–4 in this article with figs 21–28 in Gorbunov, 2018) and abdomen (dorsally black with dark greenish sheen; tergites 2 and 4 each with few yellow scales distally; tergites 6 and 7 each with a narrow yellow to yellow-orange stripe distally; ventrally dark brown to black with blue-greenish sheen; sternites 4 and 7 each with narrow yellow stripe distally; anal tuft dorsally black with dark greenish-blue sheen, ventrally yellow-orange B. aktashica , vs. black with dark violet shine; tergite 2 with a row of yellow scales distally; tergites 4, 6 and 7 each with broad yellow stripe distally; ventrally sternite 4 yellow; sternites 5– 7 each with broad yellow stripe distally; anal tuft dorsally black with dark violet shine, admixture of yellow scales medially and yellow ventrally in B. yakovlevi sp.n.; cp. Figs 3–4 in this article with figs 21–28 in Gorbunov, 2018). In addition, these two species are well distinguished from each other by the structure of the transparent areas of the forewing (transparent areas poorly-developed, posterior transparent area nearly undeveloped, anterior transparent area rather small, densely covered with translucent scales with light golden-greenish hue; external transparent area relatively small, covered with translucent scales with light golden-greenish hue, divided into four cells between veins R 4+5 and CuA 1, level to vein M 2 about as broad as discal spot and about twice broader than apical area B. aktashica , vs. transparent areas well-developed, densely covered with translucent scales with light golden hue; posterior transparent area short but reaching level of discal spot of hindwing; external transparent area large, rounded, divided into four cells between veins R 5 and CuA 1, level to vein M 2 about three times as broad as discal spot and about 4.3 times as broad as apical area in B. yakovlevi sp.n.; cp. Figs 3–4 in this article with figs 21–28 in Gorbunov, 2018) and by the shape of the crista sacculi in the male genitalia; cp. Fig. 11 in this publication and fig. 43 in Gorbunov, 2018.

From all other Mongolian congeners, B. yakovlevi sp.n. clearly differs in colouration of the wings and abdomen.

BIONOMICS. The larval host plant is unknown. The holotype was collected with a butterfly net by mowing over grassy vegetation.

HABITAT. Mountain polydominant steppes ( Fig. 16 ).

DISTRIBUTION. This species is known only from the type locality in the Hara Adzragyn-Nuruu Mts. in the eastern part of the Mongolian Altai Range at an altitude of about 1800 m above sea level .

ETYMOLOGY. This new species is named after my friend Prof. Roman V. Yakovlev, a lepidopterist, Cossidae specialist and passionate researcher of Lepidoptera in Mongolia, who collected the holotype of this species.

Acknowledgements. I would like to express my cordial gratitude to Academician of the Russian Academy of Sciences Prof. Yuri Yu. Dgebuadze for the offer to take part in the Joint Russian-Mongolian Complex Biological Expedition to study the fauna of Lepidoptera of Mongolia. I am also grateful to the head of the expedition, the late Prof. Peter D. Gunin (1942–2019), for organizing expedition trips around Mongolia. My endless thanks to Mongolian colleagues Drs J. Puntsgdulam, D. Altanchimeg and L. Jargalsaikhan (all from Ulan Bator, Mongolia). I would like to express my heartfelt gratitude to Prof. Roman V. Yakovlev ( Barnaul , Russia) for kindly providing the material for the study and Dr. Zsolt Bálint (Budapest, Hungary) for sending photographs of the type specimens and their genitalia of the clearwing moths species described by I. CăpuȘe. I am indebted to Dr. Anatoly V. Krupitsky (Moscow, Russia) for carefully checking the English of an advanced draft .

The study was conducted using the equipment of the Joint Usage Center “Instrumental methods in ecology” at the A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences (Moscow, Russia). The investigation was fulfilled within the State research projects Nos. AAAA-A18- 118042490060 - 1 .

Figures

Figs 1–4. Bembecia spp. 1–2 — Bembecia khovdensis O. Gorbunov, sp.n., holotype ♂, alar expanse 14.9 mm. Sesiidae picture Nos 0033- 0034–2023; 3–4 — Bembecia yakovlevi O. Gorbunov, sp.n., holotype ♂, alar expanse 21.4 mm. Sesiidae picture Nos 0027-0028–2023. 1, 3 — dorsal view; 2, 4 — ventral view. Рис. 1–4. Bembecia spp. 1–2: Bembecia khovdensis O. Gorbunov, sp.n., голотип ♂, раЗмах крыльев 14.9 мм. Sesiidae снимки №№ 0033-0034–2023; 3–4 — Bembecia yakovlevi O. Gorbunov, sp.n., holotype ♂, раЗмах крыльев 21.4 мм. Sesiidae снимки №№ 0027-0028– 2023. 1, 3 — вид сверху; 2, 4 — вид сниЗу.

Figs 10–14. Genitalia of Bembecia yakovlevi O. Gorbunov, sp.n., holotype ♂. Genital preparation No OG–009-2023: 10 — tegumenuncus complex; 11 — valva; 12 — saccus; 13 — phallus; 14 — vesica. Scale bar 0.5 mm for 10–13 and 0.2 for 14. Рис. 10–14. Гениталии Bembecia yakovlevi O. Gorbunov, sp.n., голотип ♂. Препарат гениталий № OG–009-2023: 10 — тегумен- ункусный комплекс; 11 — вальва; 12 — саккус; 13 — фаллюс; 14 — веЗика. МасШтаб 0,5 мм длЯ 10–13 и 0,2 длЯ 14.

Fig. 16. The type locality of Bembecia yakovlevi O. Gorbunov, sp.n.: Mongolia, Gobi-Altai Aimag, Hara Adzragyn-Nuruu Mts., 1800 m, 45°52´N, 095°30´E, 15–16.VII.2010. Photo by R. Yakovlev. Рис. 16. Типовое местонахождение Bembecia yakovlevi O. Gorbunov, sp.n.: МонголиЯ, Гоби-Алтайский аймак, горы Хара- АдЗрагын-Нуру, 1800 м, 45°52΄ с.Ш., 095°30´в.д., 15–16.VII.2010. Фото Р. Яковлев.