Intybia donan Ikeda & Yoshitomi 2017, sp. nov.

Intybia donan sp. nov.

urn:lsid:zoobank.org:act: DCD7FF92-1188-40E9-8AE9-94BE4CA028B7

[Japanese name: Yotsu-mon-obi-jôkai-modoki]

Figs 1C, 2C, 4C, 5C, 6C, H, 9C, 10C, 11A, 12 C–D

Diagnosis

Elytra with four pale yellow spots; antennomere I long, abruptly widened from near the middle; antennomere III ginkgo-like shaped, two concavities on outer edge and provided with a slender tonguelike projection near base; gonoporal piece gently curved, constricted near the middle; semi-gonoporal piece slightly curved; ligula long, slightly curved; spinous plate absent.

Etymology

After the old name of the type locality Yonaguni-jima.

Material examined

Holotype

JAPAN: ♂, Mantabaru-shinrinkôen, Yonaguni-chô, Yaeyama-gun, 24°27′31.77′′ N, 122°58′31.31′′ E, 4 May 2016, H. Ikeda leg. (EUMJ).

Paratypes

JAPAN: 2 ♂♂, 1 ♀, same data as for the holotype (EUMJ); 3 ♂♂, same data as for the holotype, but 30 Apr. 2016, N. Tsuji leg. (NTJ); 2 ♀♀, same data as for the holotype, but 30 Apr. 2016, H. Ikeda leg. (EUMJ); 2 ♂♂, same data as for the holotype, but 29 Apr. 2015, Y. Ogata leg. (YOJ); 1 ♂, Tarumai (LT), Yonaguni-jima, 10 Sep. 2004, Shiho and Koji Arai leg. (EUMJ); 1 ♂, Yonaguni-jima, Urabu-dake, 28 Apr. 1993, Y. Kaneko leg. (EUMJ); 1 ♀, Yonaguni-jima, Tokorono, 13 May 1974, H. Hiramatsu leg. (KUM).

Description

Male

Body (Fig. 1C) oblong oval, shining, densely covered with yellow pubescence, and sparsely covered with long erect hairs. Coloration of head, pronotum and elytra black; antennae, two pairs of elytral spots, and legs pale yellow.

Head sparsely and minutely punctate; eyes moderately prominent; HL/HW 0.51–0.79 (0.63). Antennae (Fig. 4C) long, nearly reaching base of elytra; antennomere I long, abruptly widening from middle onwards; antennomere III (Fig. 6C) ginkgo-leaf shaped, with two concavities on outer edge, with a slender tongue-like projection near base; L/W = 1.53; approximate ratio of each antennomeres (n = 1) as 8.3: 1.0: 9.7: 2.3: 2.7:3.3:3.3: 3.3: 3.3: 3.7: 6.3. Pronotum slightly broader than long, sparsely and minutely punctate; PW/PL 1.07–1.27 (1.18). Elytra oblong-ovate, slightly broadened posteriorly, somewhat densely punctate; two large and oval pairs of elytral spots; EL/EW 1.22–1.48 (1.39); EL/PL 2.58–3.14 (2.77); EW/PW 1.48–1.82 (1.69); TL/EW 2.02–2.56 (2.27). Aedeagus about 0.48 mm in AL. Gonoporal piece (Fig. 10C) gently curved, constricted from near the middle 0.23 mm in GL; GL/AL 0.48. Semi-gonoporal piece slightly curved, 0.19 mm in SGL. Ligula long slightly curved, 0.05 mm in LL. Spinous area (Fig. 9C) bearing short spines, lacking spinous plate.

Female

Similar to male in general appearance (Fig. 2C); HL/HW 0.52–0.60 (0.57); PW/PL 1.08–1.18 (1.15); EL/EW 1.34–1.43 (1.40); EL/PL 2.73–3.04 (2.94); EW/PW 1.78–1.92 (1.83); TL/ EW 2.08–2.23 (2.18). Antennae (Fig. 5C) long; antennomere III distinctly expanded laterally, shallowly concave in dorsal portion, L/W = 1.78; approximate ratio of each antennomere (n = 1) as 6.3: 1.0: 4.0:2.3: 2.5: 2.5: 2.8: 2.8: 2.8:2.8: 4.8.

Measurements

Male (n = 10): TL 2.23–2.52 (2.40) mm; HL 0.32–0.46 (0.39) mm; HW 0.57–0.67 (0.62) mm; PW 0.60–0.67 (0.63) mm; PL 0.50–0.58 (0.53) mm; EL 1.31–1.62 (1.48) mm; EW 0.89–1.20 (1.06) mm.

Female (n = 4): TL 2.46–2.88 (2.66) mm; HL 0.32–0.42 (0.37) mm; HW 0.62–0.70 (0.66) mm; PW 0.62–0.73 (0.67) mm; PL 0.53–0.62 (0.58) mm; EL 1.61–1.84 (1.70) mm; EW 1.12–1.30 (1.22) mm.

Distribution (Fig. 11A)

Only known from the type locality, Yonaguni-jima of Japan.

Remarks

This species is distinct in having a small body and four elytral spots. It is similar to Intybia viridithorax (Pic, 1921) in the shapes of antenna and male genitalia (Wittmer 1997), and differs from the latter by the coloration of the elytra with four spots (I. viridithorax has fascia).

Biological notes

This species is rare, inhabits forest edges (Fig. 12C), can be collected from the flowers of Ardisia sieboldii Miquel and Meliosma oldhamii Miquel ex Maximowicz (Fig. 12D), and can be collected from shrubs and bushes by sweeping, beating, and light traps.