Intybia tsushimensis (Satô & Ohbayashi, 1968)

Ikeda, Hiroshi & Yoshitomi, Hiroyuki, 2017, Revision of the genus Intybia (Coleoptera, Malachiidae) from Japan, European Journal of Taxonomy 331, pp. 1-31 : 15-18

Intybia tsushimensis (Satô & Ohbayashi, 1968) [Japanese name: Tsushima-hiro-obi-jôkai-modoki]

Figs 1B , 2B , 4B , 5B , 6B , 9B , 10B , 11A

Laius tsushimensis Satô & Ohbayashi, 1968: 5

[type locality: Mt. Ariake-yama, Tsushima].

Laius tsushimensis – Nakane 1983: 164.— Satô 1985: 164, pl. 26, fig. 6.— Satô 1989: 366.

Intybia tsushimensis – Wittmer 1997: 191.— Mayor 2007: 417 [catalogued].— Yoshitomi & Hayashi 2011: 19.

Diagnosis

Elytra with a pale yellow fascia, just before the middle, which is narrowed at suture; legs fully black; antennomere III cylinder-like shaped, shallowly concave in dorso-mesal portion, and provided with a tongue-like projection near behind; gonoporal piece pluri-curved, slender; semi-gonoporal piece slightly curved; ligula short; spinous plate absent.

Material examined

Holotype

JAPAN: ♂, [Is. Tsushima, Mt. Ariake , July, 16. 1960, M. Satô leg.] ( EUMJ).

Paratypes

JAPAN: 1 ♂, 1 ♀, same data as for the holotype; 1 ♀, Izuhara, Tsushima, 21 Aug. 1968, S. Nomoto leg. ( EUMJ).

Additional specimens

JAPAN, Tsushima Is.: 1 ♂, Ariake-san, 6 Aug. 1956, Y. Miyake leg. ( EUMJ); 1 ♂, Sasuna, 31 Jul. 1977, K. Matsuda leg. ( EUMJ); 1 ♀, same data, 2 Aug. 1977, K. Matsuda leg. ( EUMJ); 1 ♀, Mitake, 29 Jun. 1980, N. Ohbayashi leg. ( EUMJ); 1 ♂, Sasuna, 14 Jul. 1985, K. Ando leg. ( EUMJ); 1 ♂, Mokkoku-san, Izuhara-chô, 13 Jul. 2000, Y. Sugiura leg. ( EUMJ); 1 ♂, Tsushima, 11 Jul. 1969 ( EUMJ); 1 ♂, same data, 14 Jul. 1969, S. Miyamato leg. ( EUMJ); 1 ♀, Izuhara-Sasutôge, 24 Aug. 1941, T. Shirôzu leg. ( SEHU); 2 ♂♂, Shitasaki, Kamitsuhisma-machi, 21 Jun. 2002, T. Kurihara leg. ( EUMJ); 1 ♂, Waniura, Kamitsushima-machi, 21 Jun. 2002, T. Kurihara leg. ( EUMJ); 1 ♂, Kechi, Mitsushima-chô, 22 Jun. 2002, T. Kurihara leg. ( EUMJ); 1 ♂, Sumo, Mitsushima-chô, 15 Jun. 2002, T. Kurihara leg. ( EUMJ); 1 ♀, Ayumodoshi-shizenkoen, Izuhara-machi, Tsushima-shi, 8 Aug. 2013, N. Tsuji leg. ( NTJ).

Redescription

Male

Body ( Fig. 1B ) oblong oval, shining, densely covered with yellow pubescence. Coloration of head, pronotum and elytra black; antennae yellow, with apical 6 or 7 segments black; elytral fascia pale yellow; legs black.

Head sparsely and minutely punctate; eyes normal, moderately prominent; HL/HW 0.59–0.89 (0.71). Antennae ( Fig. 4B ) long, nearly reaching base of elytra; antennomere III ( Fig. 6B ) cylinder-like shaped, shallowly concave in dorso-mesal portion, with a tongue-like projection posteriorly; L/W = 1.47; approximate ratio of each antennomere (n = 1) as 13.0:1.0: 14.7:2.7: 3.3: 3.7: 4.0: 4.0: 4.0:3.7:5.0. Pronotum slightly broader than long, sparsely and minutely punctate; PW/PL 1.06–1.17 (1.14). Elytra oblong-ovate, slightly broadened posteriorly, shallowly and somewhat densely punctate; elytral fascia situated just before the middle, narrowed at suture; EL/EW 1.27–1.71 (1.49); EL/PL 2.35–2.94 (2.80); EW/PW 1.53–1.83 (1.69); TL/EW 2.17–2.72 (2.41). Aedeagus about 1.00 mm in AL. Gonoporal piece ( Fig. 10B ) winding, slender, bearing minute spines in middle part, 0.32 mm in GL; GL/AL 0.32. Semi- gonoporal piece slightly curved, 0.20 mm in SGL. Ligula short, 0.05 mm in LL. Spinous area ( Fig. 9B ) bearing short triangular spines, lacking spinous plate.

Female

Similar to male in general appearance ( Fig. 2B ); HL/HW 0.57–0.79 (0.67); PW/PL 1.03–1.21 (1.14); EL/EW 1.36–1.71 (1.52); EL/PL 2.76–3.19 (3.01); EW/PW 1.51–1.87 (1.74); TL/ EW 2.11–2.68 (2.40). Antennae long ( Fig. 5B ); antennomere III distinctly expanded laterally, shallowly concave in dorsal portion, L/W = 2.30; approximate ratio of each antennomere (n = 1) as 9.7: 1.0: 7.7:3.7: 3.7: 3.7: 4.0: 4.0: 4.0:3.3: 4.0.

Measurements

Male (n = 12): TL 3.07–3.64 (3.39) mm; HL 0.47–0.63 (0.55) mm; HW 0.57–0.87 (0.78) mm; PW 0.75–0.88 (0.84) mm; PL 0.67–0.81 (0.75) mm; EL 1.90–2.32 (2.09) mm; EW 1.19–1.54 (1.41) mm.

Female (n = 6): TL 3.38–4.05 (3.58) mm; HL 0.50–0.70 (0.56) mm; HW 0.77–0.89 (0.83) mm; PW 0.79–0.95 (0.86) mm; PL 0.70–0.80 (0.75) mm; EL 2.10–2.55 (2.25) mm; EW 1.28–1.74 (1.49) mm.

Distribution ( Fig. 11A )

Japan (Tsushima Is.)

Remarks

The species is similar to Intybia histrio ( Kiesenwetter, 1874) in the shape of the male antennomere III, elytral coloration and endophallic structures, and differs from it in the coloration of the legs and antennae, and in the shapes of the semi-gonoporal piece and ligula. This species seems to be endemic to Tsushima Is.

Biological notes

This species inhabits forest edges and grasslands, and can be collected from shrubs and bushes by sweeping and beating.

Figures

Fig. 1. Dorsal habitus Intybia spp., ♂. A. Intybia histrio (Kiesenwetter, 1874). B. I. tsushimensis (Satô & Ohbayashi, 1968). C. I. donan sp. nov., holotype. D. I. pelegrini pelegrini (Pic, 1910). E. I. niponica (Lewis, 1895). F. I. takaraensis (Nakane, 1955). G. I. kishiii (Nakane, 1955). H. I. kawasakii (Nakane, 1956), holotype. Scales = 1.0 mm.

Fig. 2. Dosal habitus of Intybia spp., ♀. A. Intybia histrio (Kiesenwetter, 1874). B. I. tsushimensis (Satô & Ohbayashi, 1968). C. I. donan sp. nov., paratype. D. I. pelegrini pelegrini (Pic, 1910). E. I.niponica (Lewis, 1895). F. I.takaraensis (Nakane, 1955).G. I. kishiii (Nakane, 1955). H. I. kawasakii (Nakane, 1956), paratype. Scale bars = 1.0 mm.

Fig. 4. Right antennae of Intybia spp., ♂. A. Intybia histrio (Kiesenwetter, 1874). B. I. tsushimensis (Satô & Ohbayashi, 1968). C. I. donan sp. nov. D. I. pelegrini pelegrini (Pic, 1910). E. I. niponica (Lewis, 1895). F. I. takaraensis (Nakane, 1955). G. I. kishiii (Nakane, 1955). H. I. kawasakii (Nakane, 1956). Scale bars = 0.2 mm.

Fig. 5. Right antennae of Intybia spp., ♀. A. Intybia histrio (Kiesenwetter, 1874). B. I. tsushimensis (Satô & Ohbayashi, 1968). C. I. donan sp. nov. D. I. pelegrini pelegrini (Pic, 1910). E. I. niponica (Lewis, 1895). F. I. takaraensis (Nakane, 1955). G. I. kishiii (Nakane, 1955). H. I. kawasakii (Nakane, 1956). Scale bars = 0.2 mm.

Fig. 6. SEM photographs of right male antennomere III of Intybia spp. A. Intybia histrio (Kiesenwetter, 1874). B. I. tsushimensis (Satô & Ohbayashi, 1968). C, H. I. donan sp. nov., showing projection (H). D. I. pelegrini pelegrini (Pic, 1910). E. I. niponica (Lewis, 1895). F. I. takaraensis (Nakane, 1955). G. I. kishiii (Nakane, 1955).

Fig. 9. Spinous area and spinous plate of Intybia spp. A. Intybia histrio (Kiesenwetter, 1874). B. I. tsushimensis (Satô & Ohbayashi, 1968). C. I. donan sp. nov. D. I. pelegrini pelegrini (Pic, 1910). E. I. niponica(Lewis,1895). F. I. takaraensis (Nakane, 1955). G. I. kishiii (Nakane, 1955).Abbreviations: sa = spinous area; sp = spinous plate. Scales = 0.1 mm.

Fig. 10. Endophallic sclerites of Intybia spp. A. Intybia histrio (Kiesenwetter, 1874). B. I. tsushimensis (Satô & Ohbayashi, 1968). C. I. donan sp. nov. D. I. pelegrini pelegrini (Pic, 1910). E. I. niponica (Lewis, 1895). F. I. takaraensis (Nakane, 1955). G. I. kishiii (Nakane, 1955). Abbreviations: gp = gonoporal piece; l = ligula; sgp = semi-gonoporal piece. Scale bars = 0.1 mm.

Fig. 11.Map showing thedistribution of Intybia spp.A.The histriogroup:●:Intybia histrio(Kiesenwetter, 1874), ▲: I. tsushimensis (Satô & Ohbayashi, 1968), ■: I. donan sp. nov.). B. The pelegrini group: ○: I. pelegrini (Pic, 1910), △: I. niponica (Lewis, 1895), □: I. takaraensis (Nakane, 1955), ×: I. kishiii (Nakane, 1955), +: I. kawasakii (Nakane, 1956).