Taikona ikedai, Gorbunov & Arita, 2019

Gorbunov, Oleg G. & Arita, Yutaka, 2019, A new species of the genus Taikona Arita & O. Gorbunov, 2001 from Vietnam (Lepidoptera: Sesiidae), Zootaxa 4624 (1), pp. 137-141 : 138-141

Taikona ikedai sp. nov. ( Figs 1–6 )

Holotype ♂ ( Figs 1, 2 ) with labels: “ Baolac , 800 m / S. Vietnam / 1–5.V.2000 / Masumi Ikeda leg.”; “Yutaka Arita / Collection, NSMT / Donation, 2009 / Ʀm ȐṞ± Ạae ”; “ SESIIDAE / Pictures №№ / 0165-0166–2018 / Photo by O. Gorbunov ”; “Genitalia examined / by O. Gorbunov / Preparation № / OG–026-2018”; “ HOLOTYPUS ♂ / Taikona ikedai / O. Gorbunov et Arita, 2018 / O. Gorbunov des., 2018”. Paratypes. 2 ♂♂, same label data as ho- lotype.

Description. Male (holotype) ( Figs 1, 2 ). Alar expanse 29.0 mm; body length 16.0 mm; forewing 12.4 mm; antenna 7.0 mm.

Head with antenna dark brown to black with dark blue-violet sheen and a few lemon-yellow scales exteriorventrally at base; scapus dark grey with bronze sheen dorsally and lemon-yellow ventrally; frons grey with strong golden-green sheen and a narrow white margin with bluish sheen laterally; vertex dark brown to black with greenish-violet sheen; basal joint of labial palpus dark brown to black with greenish-violet sheen and a few pale yellow to lemon-yellow scales interior-ventrally; mid joint pale yellow to yellow ventrally and dark brown to black with greenish-violet sheen dorsally; apical joint entirely dark brown to black with greenish-violet sheen; occipital fringe mixed with white and dark brown hairs.

Thorax with patagia dark brown to black with bronze-violet sheen; tegula dark brown to black with greenish-bronze sheen and a small dark grey-brown spot with bronze-violet sheen at base of forewing; mesothorax dark brown to black with greenish-bronze sheen; metathorax dark brown to black with greenish-bronze sheen and a few lemon-yellow scales laterally; beside this, tegula, meso- and metathorax covered with short white hairs; thorax laterally dark grey-brown with blue-violet sheen and two large lemon-yellow spots anteriorly and at base of forewing; posteriorly both metepimeron and metameron dark grey-brown with bronze-violet sheen, covered with long yellow hairs. Legs with neck plate dark brown to black with bronze-violet sheen; fore coxa dark brown to black with greenish-violet sheen and a few lemon-yellow scales; both fore femur and tibia dark brown to black with greenishviolet sheen and a tuft of long dark brown to black scales with greenish sheen posteriorly; fore tarsus dark brown to black with greenish sheen and an admixture of pale yellow scales ventrally; mid coxa dark brown to black with bronze-violet sheen and a few lemon-yellow scales anteriorly; mid femur dark brown to black with greenish sheen and a row of white hairs posteriorly; mid tibia dark brown to black with greenish-bronze sheen and with an elongate lemon-yellow spot externally in basal half; spurs dark brown to black with greenish sheen externally and white internally; mid tarsus dark brown to black with greenish sheen dorsally and pale yellow ventrally; hind coxa lemonyellow with a few dark brown to black with bronze sheen posteriorly; hind femur dark brown to black with bronzepurple sheen and a row of white hairs posteriorly; hind tibia dark brown to black with purple-greenish sheen and with a dense admixture of lemon-yellow scales dorsally; spurs dark brown to black with greenish sheen externally and white internally; hind tarsus dark brown to black with bronze-purple sheen and with a few pale yellow scales internally on two basal tarsomeres. Forewing dorsally with basal part black with greenish sheen; both dorsally and ventrally CuA-stem, both costal and anal margins, discal spot, veins distally of discal spot, outer margin and cilia dark brown to black with dark violet sheen; discal spot narrow, oblique with parallel edges; apical area undeveloped; transparent areas well-developed; external transparent area extremely large, divided into seven cells between veins R 3 –CuA 2, level to vein M 2 about 7 times as broad as discal spot. Hindwing transparent but veins, discal spot, outer margin and cilia both dorsally and ventrally dark brown to black with dark violet sheen; discal spot narrow, reaching to vein M 3.

Abdomen dorsally dark brown to black with dark purple-violet sheen; tergites 2–7 each with a rather broad yellow stripe with golden-purple sheen distally; ventrally each sternite with a narrow yellow stripe with golden-purple sheen distally; anal tuft black with dark violet sheen.

Male genitalia (holotype) (Genital preparation № OG–026-2018) ( Figs 3–6 ). Uncus narrow, with almost the same thickness throughout, densely covered with flat scales in distal part; tegumen short; gnathos narrow, with double tooth; tuba analis with subscaphium narrowly sclerotized ( Fig. 3 ); valva ( Fig. 4 ) trapeziform-oval, densely covered with hand-shaped setae at dorsal margin, short simple setae at distal margin and long simple setae at ventral margin in distal half; crista sacculi low, densely covered with strong pointed setae; saccus ( Fig. 5 ) about as long as vinculum, straight, narrow, somewhat rounded basally; aedeagus ( Fig. 6 ) rather broad, about as long as valva, with a hook-shaped well-sclerotized carina penis dorsodistally; vesica with numerous rows of minute flat cornuti.

Female. Unknown.

Individual variability. Unknown.

Differential diagnosis. This new species is somewhat similar to the “yellow-banded” species of the genus, namely T. actinidiae and T. matsumurai . In comparison T. ikedai sp. nov. can be distinguished from the first species by the colouration of the tegula (yellow in T. actinidiae , vs. dark brown to black with greenish-bronze sheen and a small dark grey-brown spot at the base of the forewing in T. ikedai sp. nov.), the colouration of the abdomen dorsally (tergites 2 and 3 each with a narrow yellow stripe distally, tergite 6 entirely yellow in T. actinidiae , vs. tergites 2–7 each with a rather broad yellow stripe distally in T. ikedai sp. nov.), and by the presence of the outer margin of the forewing (the outer margin of the forewing is undeveloped in the new species). From T. matsumurai , this new species clearly differs by the colouration of the thorax dorsally (the patagia is dark brown to black with a bright green sheen and an admixture of individual yellow-orange scales laterally; the tegula is dark brown but densely covered with yellow-orange scales masking the background colouration and with a large yellow to pale yellow spot at the base of the forewing in T. matsumurai , vs. the dark brown to black patagia with bronze-violet sheen, the dark brown to black tegula with greenish-bronze sheen and a small dark grey-brown spot with bronze-violet sheen at the base of the forewing in T. ikedai sp. nov.), the colouration of the abdomen dorsally (tergites 2, 4 and 6 each with a narrow yellow stripe distally in T. matsumurai , vs. tergites 2–7 each with a rather broad yellow stripe distally in T. ikedai sp. nov.; compare Fig. 1 with fig 18 in Arita & Gorbunov 2001), by the colouration of the discal spot of the forewing (light brown in T. matsumurai , vs. dark brown to black with dark violet sheen in the new species), by the undeveloped discal spot of the hindwing (narrow, reaching to vein M 3 in T. ikedai sp. nov.), and by the conformation of the male genitalia (compare Figs 3–6 with fig. 53 in Arita & Gorbunov 2001). T. ikedai sp. nov. is clearly separable from T. polevoyi by the presence of yellow scales on different parts of the body (the head, thorax, legs and abdomen with neither yellow nor yellow-orange scales in T. polevoyi ) and by the structure of the male genitalia, compare Figs 3–6 with figs 7–11 in Gorbunov 2018. From other species of Paranthreninae of the Oriental Region, T. ikedai sp. nov. differs by the transparent forewing and the conformation of the male genitalia.

Bionomics. The larval host plant of this new species is unknown. The holotype was collected in the beginning of May.

Habitat. The holotype was collected in a clearing in the secondary tropical forest.

Distribution. Known from the type locality in South Vietnam only.

Etymology. This species we name after our late friend Masumi Ikeda (1949–2004), who loved clearwing moths and caught the holotype of this new species.

Figures

FIGURES 1–2. Male (holotype) of Taikona ikedai sp. nov. 1) upside. Sesiidae picture № 0165–2018. Alar expanse 29.0 mm; 2) ditto, underside. Sesiidae picture 0166–2018.

FIGURES 3–6. Male genitalia of Taikona ikedai sp. nov. Genital preparation № OG–026-2018. 3) tegumen-uncus complex; 4) valva; 5) saccus; 6) aedeagus. Scale bar: 0.5 mm.