Paranthrenella tricincta O. Gorbunov, 2024

Gorbunov, O. G., 2024, A new species of the genus Paranthrenella Strand, 1916 (Lepidoptera: Sesiidae) from Malaysia, Far Eastern Entomologist 494, pp. 1-13 : 3-8

Paranthrenella tricincta O. Gorbunov , sp. n.

https://zoobank.org/NomenclaturalActs/ CF592D7C-05CF-469F-A959-6162867E3DF9

Figs 1–14

MATERIAL. Holotype – ♂, with labels: “ W. Malaysia, Pahang, / Fraser’s Hill , 1300 m, / 03°43ʹN, 101°44ʹE, / 17.VII.2009, ex l., / O. Gorbunov leg.”; “Host plant: / Rubus sumatranus / ( Rosaceae ) / Moth emerged 15.VIII.2009 ”; “ SESIIDAE / Pictures №№ / 0041-0042–2023 / Photo by O. Gorbunov ”; “Genitalia examined / by O. Gorbunov / Preparation № / OG–018-2018”; “ HOLOTYPUS ♂ / Paranthrenella tricincta / O. Gorbunov, 2024 / O. Gorbunov des., 2023”. Paratypes: 1 ♂, with same locality and date as in holotype, ex l., O. Gorbunov leg., emerged 15.VIII.2009 (Pictures №№ 0039-0040–2023; genitalia preparation № OG–019-2018); 1 ♀, with same locality and date as in holotype, ex l., O. Gorbunov leg., emerged 06.IX.2009 (Pictures №№ 0043-0044–2023) .

DESCRIPTION. Male (holotype) ( Figs 1–2 , 13 ). Wing expanse 18.8 mm; body length 9.4 mm; forewing length 8.6 mm; length of antenna 6.3 mm.

Head: antenna black with dark blue-violet shine, scapus black with blue shine dorsally and lemon-yellow ventrally; frons dark brown to black with bronze-violet shine and narrow silvery-white stripe laterally; labial palpus black with dark bronze-blue shine exterior-dorsally and lemon-yellow interior-ventrally; vertex black with bright greenish shine; occipital fringe black mixed with lemon-yellow dorsally and lemon-yellow laterally; neck plate lemon-yellow with few black scales with bright violet shine.

Thorax: patagia black with bright greenish shine and few lemon-yellow scales laterally; tegula black with bright greenish shine and narrow lemon-yellow inner margin; mesonotum black with bright greenish shine anteriorly and greenish-violet shine posteriorly, and few lemon-yellow scales cranially; metanotum mixed with black with greenish-violet shine and lemon-yellow scales; thorax laterally dark brown to black with bright violet shine and large lemon-yellow spot medially; both metepimeron and metameron posteriorly smooth-scaled mixed with dark brown with violet shine and pale lemon-yellow scales. Fore coxa lemon-yellow with golden tint and admixture of black scales with bright violet shine; fore femur black with bright violet shine externally and lemon-yellow internally; fore tibia lemon-yellow with admixture of black scales with bronze-violet shine dorsally; fore tarsus ventrally lemon-yellow, dorsally black with bronze-violet shine and small lemon-yellow spot distally on two basal tarsomeres. Mid coxa black with bright violet shine; mid femur black with bright violet shine externally and lemon-yellow internally; mid tibia black with bright violet shine exterior-dorsally and distally, lemon yellow interior-ventrally, exterior medially and at base of spurs; spurs pale lemon-yellow with golden tint; mid tarsus black with bright bronze-violet shine exterior-dorsally, lemon-yellow interior-ventrally and small lemon-yellow spot dorso-distally on basal tarsomere. Hind coxa black with bright violet shine and narrowly lemon-yellow internally; hind femur dark black with bright violet shine externally and lemon-yellow internally; hind tibia black with bright violet shine exterior-dorsally and distally, lemon yellow interior-ventrally and at base of both pairs of spurs; spurs pale lemon-yellow with golden tint; hind tarsus black with bright bronze-violet shine exterior-dorsally, lemon-yellow interior-ventrally and small lemon-yellow spot dorso-distally on two basal tarsomeres.

Forewing dorsally with basal part black with bright greenish shine and small lemon-yellow spot; costal and anal margins, CuA-stem, discal spot, veins within external transparent area and apical area black with dark violet shine; ventrally costal and anal margins, CuA-stem, discal spot, veins within external transparent area and apical area black with dark bronze-violet shine with few lemon-yellow scales on costal margin distally and on apical area between veins R 4 –M 2; cilia dark brown with bronze shine; discal spot almost rectangular, narrow, level to vein M 2 about 0.7 times as broad as apical area; transparent areas well-developed; posterior transparent area exceeding distal margin of discal spot; external transparent area large, rounded distally, divided into six cells between veins R 3 and CuA 1, level to vein M 2 about 6.75 times as broad as discal spot. Hindwing transparent; dorsally costal margin, discal spot, veins and outer margin black with dark bronze-violet shine; ventrally with few lemon yellow scales on costal margin; cilia dark brown with bronze shine, anally yellow; discal spot triangular, small, reaching base of vein M 2; outer margin narrow, about 0.2 times as broad as cilia.

Abdomen dorsally black with bright greenish-violet shine; tergites 3–5 each with narrow lemon-yellow stripe distally; ventrally black with bronze-violet shine; sternite 2 with few pale lemon-yellow scales both cranially and laterally; sternite 3 with few lemon-yellow scales distally; remaining sternites densely mixed with lemon-yellow scales; anal tuft well-developed, black with bright greenish-violet shine and narrow lemon-yellow exterior margin.

MALE GENITALIA (paratype, genital preparation № OG–018-2018) ( Figs 7– 11 ). Tegumen-uncus complex relatively broad; scopula androconialis well-developed, about 0.9 times as long as tegumen-uncus complex ( Fig. 7 ); crista gnathi medialis long and broad; crista gnati lateralis elongated semi-oval, short and slightly shorter than crista gnathi medialis ( Fig. 7 ); valva ( Fig. 8 ) trapeziform-oval, crista sacculi oblique, long, about 0.4 as long as length of valva, nearly flat, anteriorly not separated from sensory field of setae, covered with apically bifurcate setae; ventral crista small, covered with triangular flat-topped setae; saccus ( Fig. 9 ) slightly broadened basally with somewhat bifurcated base, short, slightly shorter than vinculum; aedeagus ( Fig. 10 ) thin, straight, slightly shorter than valva; vesica with numerous, strong, irregular, nearly flat cornuti ( Fig. 11 ) .

FEMALE (paratype) ( Figs 5–6 ). Slightly larger and robust than male. Wing expanse 20.5 mm; body length 10.4 mm; forewing length 9.3 mm; length of antenna 5.5 mm.

Head: antenna black with dark blue-violet shine and few lemon-yellow scales ventrally, scapus black with blue shine dorsally and lemon-yellow ventrally; frons silvery-white with yellowish with golden tint scales medially; labial palpus lemon-yellow with few black scales externally on mid palpomere and dorso-distally on apical palpomere; vertex black with bright greenish shine; occipital fringe lemon-yellow; neck plate lemon-yellow with few black scales with bright violet shine.

Thorax: patagia black with bright greenish shine and few lemon-yellow scales laterally; tegula lemon-yellow with black scales with bright greenish shine medially; mesonotum black with bright greenish shine anteriorly and greenish-violet shine posteriorly, and few lemon-yellow scales cranially; metanotum lemon-yellow; thorax laterally lemon-yellow with bright golden tint; both metepimeron and metameron posteriorly smooth-scaled pale lemon-yellow.

Legs: fore coxa lemon-yellow with golden tint; fore femur black with bright violet shine externally and lemon-yellow internally; fore tibia and fore tarsus lemon-yellow with golden tint; mid coxa lemon-yellow with golden tint; mid femur lemon-yellow with golden tint and large black spot with bright violet shine dorso-distally; mid tibia lemon-yellow with golden tint and large black spot with bronze-violet shine dorso-subdistally; spurs pale lemon-yellow with golden tint; mid tarsus black with bright bronze-violet shine exterior-dorsally, lemon-yellow interior-ventrally and large lemon-yellow spot dorso-distally on two basal tarsomeres; hind coxa lemon-yellow with golden tint and black scales with bright violet shine at posterior margin; hind femur lemon-yellow with golden tint and large black spot with bright violet shine exterior-distally; hind tibia lemon-yellow with golden tint and large black spot with bright violet shine both dorso-basally and subdistally; spurs pale lemon-yellow with golden tint; hind tarsus lemon-yellow with golden tint, dorso-externally three basal tarsomeres black with bright bronze-violet shine and large lemon yellow spot distally, forth tarsomere lemon-yellow with golden tint and few black scales with bright bronze-violet shine, apical tarsomere lemon-yellow with golden tint.

Forewing dorsally with basal part black with bright greenish shine and small lemon-yellow spot; costal margin black with dark violet shine and narrow lemon-yellow stripe between vein Sc and R-stem; CuA-stem black with dark violet shine; anal margin mixed with black and lemon-yellow scales; discal spot black with dark violet shine; veins within external transparent area black with dark violet sheen and yellow scales on veins M 1 and M 2 basally; apical area lemon-yellow with golden tint and with black veins with dark violet shine; outer margin extremely narrow black with dark violet shine; ventrally costal and anal margins and CuA-stem black with dark bronze shine and admixture of lemon-yellow scales; discal spot black with dark bronze-violet shine; veins within external transparent area black with dark bronze-violet sheen and yellow scales on veins M 1 and M 2 basally; apical area lemon-yellow with golden tint and with black veins with dark bronze-violet shine; outer margin extremely narrow black with dark bronze-violet shine; cilia dark brown with bronze shine; discal spot almost rectangular, narrow, level to vein M 2 about 0.5 times as broad as apical area; transparent areas well-developed but densely covered with translucent scales with brownish hue; posterior transparent area exceeding distal margin of discal spot; external transparent area large, rounded distally, divided into six cells between veins R 3 and CuA 1, level to vein M 2 about five times as broad as discal spot.

Hindwing transparent; dorsally costal margin, discal spot, veins and outer margin black with dark bronze-violet shine; ventrally costal margin and vein CuP lemon yellow; outer margin black with bronze shine and admixture of lemon-yellow scales, more dense anally; cilia dark brown with bronze shine, anally yellow; discal spot triangular, small, reaching base of vein M 2; outer margin narrow, about 0.2 times as broad as cilia.

Abdomen dorsally black with bright blue-violet shine; tergites 2–6 each with narrow (more broad on tergite 4) lemon-yellow stripe with golden tint distally; ventrally lemon-yellow with golden tint; sternite 3 with admixture of black scales with bronze shine basally; sternites 5 and 6 each with small black spot with bronze shine latero-basally; anal tuft well-developed, black with bright blue-violet shine mixed with lemon-yellow scales with golden tint.

FEMALE GENITALIA. Not studied.

INDIVIDUAL VARIABILITY. The second male ( Figs 3–4 ) has no differences in the color of the various parts of the body. It is only slightly smaller: wing expanse 18.0 mm; body length 8.7 mm; forewing length 8.0 mm; length of antenna 5.7 mm. Variation for females is unknown.

BIONOMICS. The larval host plant is Rubus sumatranus Miq. ( Rosaceae ). The larval biology is similar to that of P. dumonti and P. koshiensis (see: Gorbunov & Arita, 1995, 1999), but usually only one larva lives inside a stem about 1–2 m above the ground level ( Fig. 12 ). The larvae bores a short tunnel about 5 cm in length and pushes out the bored deposits. The presence of even small thickenings on the stem, as well as the visible results of larval activity, unmistakably indicate the presence of larvae of this species inside the stem. Pupation takes place without construction of a cocoon, inside the tunnel in a pupal chamber, which is braided with a cobweb. The pupal stage lasts slightly less than three weeks. Collected larvae were emerged 15 of August and 6 of September as the type series of this beautiful new species ( Fig. 13 ).

HABITAT. The larvae of the type series were collected on the border of the virgin tropical forest on the way to the Jeriau Waterfall ( Fig. 14 ).

DISTRIBUTION. The new species is known only from the type locality on the Titiwangsa Ridge in Raub District of the state of Pahang in West Malaysia .

ETHYMOLOGY. The name of this new species is derived from the Latin tres, tria, meaning three, and cinctus, meaning belt, and corresponding to the colouration of the abdomen of males.

Figures

Figs 1–6. Paranthrenella tricincta sp. n. 1–2 – Holotype ♂. Sesiidae picture №№ 0041- 0042–2023. Alar expanse 18.8 mm; 3–4 – Paratype ♂. Sesiidae picture №№ 0039-0040– 2023. Alar expanse 18.0 mm; 5–6 – Paratype ♀. Sesiidae picture №№ 0043-0044–2023. Alar expanse 20.5 mm. 1, 3, 5 – dorsal view; 2, 4, 6 – ventral view.

Figs 7–11. Male genitalia of Paranthrenella tricincta sp. n. Holotype, genitalia preparation № OG–018-2018. 7 – tegumen-uncus complex; 8 – valva; 9 – saccus; 10 – aedeagus; 11 – vesica. Scale bar: 0.5 mm, 0.2 mm for 11.

Figs 12–13. Paranthrenella tricincta sp. n. 12 – Pupal skin (exuvium), male, holotype, 15.VIII.2009; 13 – Freshly emerged male, holotype, 15.VIII.2009.

Fig. 14. The type locality of Paranthrenella tricincta sp. n.: West Malaysia, Pahang, Fraser’s Hill.