Arocatus nanus ( Breddin, 1900 )

Tsai, Jing-Fu & Rédei, Dávid, 2017, The genus Arocatus in Taiwan (Hemiptera: Heteroptera: Lygaeidae), Zootaxa 4299 (2), pp. 238-252 : 245

Arocatus nanus ( Breddin, 1900)

( Figs. 19 , 26–27 , 32–36 )

Microcaenocoris nanus Breddin, 1900: 171 . Lectotype ( Gaedike 1971: 118): ♂, [ Indonesia:] Sumbawa ; SDEI. Arocatus aurantium Zou & Zheng in Zheng & Zou (1981: 17) . Holotype: ♀, China: Yunnan, Xishuangbanna, Ganlanba; IZAS (examined). Synonymized by Gao et al. (2013: 693).

A bibliography was provided by Gao et al. (2013: 693).

Material examined. TAIWAN. Hsinchu Co.: Maopu , 1.x.1981, leg. T.C. Hsu (1 ♂ NTU) ; Miaoli Co.: Taian , 16.vii.1980, leg. Y.I. Chu (1 ♂ NTU) ; Nantou Co.: Sungkang , 2100 m, x.1985, Malaise trap, leg. K.S. Lin (1 ♂ TARI) ; Pingtung Co.: Koshun [= Hengchun ], 19.xi.1932, leg. R. Takahashi (1 ♀ NTU).

Diagnosis. This species is readily recognized within the genus Arocatus by its almost uniformly red dorsum lacking contrasting dark markings ( Figs. 26–27 ). It was thoroughly redescribed and illustrated by Deckert (1991) and Gao et al. (2013).

External male genitalia. Genital capsule ( Fig. 32 ) with dense, short, semierect and adpressed hairs all over its surface and scattered, long, erect hairs ventrally; lateral extension of ventral rim provided with a pair of hook-like lateral protrusions surrounding paramere sockets dorsally; cuplike sclerite ( Fig. 32 : cs) with a distinct longitudinal ridge fused with ventral rim. Paramere as in Figs. 33–36 . Phallus ( Fig. 19 ) with a losely wrinkled helicoid complex, two coils of penisfilum continued in a long, transparent filament distally which is somewhat longer than half of penisfilum.

Distribution. India (Tamil Nadu); Cambodia; Thailand; Laos; China (Yunnan, Hainan); Indonesia (Sumbawa) ( Gao et al. 2013); Taiwan (new record).

Figures

FIGURES 15 – 19. External male genitalia of Arocatus elegantulus sp. nov. (Figs. 15 – 18) and A. nanus (Breddin, 1900) (Fig. 19). Fig. 15, cuplike sclerite, dorsal view; Fig. 16, phallus, dorsal view; Fig. 17, phallus, lateral view; Fig. 18, endophallic reservoir, ventral view; Fig. 19, phallus, lateral view. Lettering: aed = aedeagus; bv = basal vestibule of aedeagus; con = conjunctiva; df = ductifer; ds = ductus seminis; hc = helicoid complex; lrs = longitudinal ridge formed by fusion of ventroposterior region of cuplike sclerite with ventral rim of genital capsule; pfi = penisfilum; phs = phallosoma; phth = phallotheca; pt = ponticulus transversalis; sbp = support bridge prolongation; sus = suspensory apodeme. Scales in mm.

FIGURES 26 – 31. Arocatus spp., dorsal and ventral views. Figs. 26 – 27, A. nanus (Breddin, 1900), male (Taiwan: Hsinchu County); Figs. 28 – 29, A. pseudosericans Gao, Kondorosy & Bu, 2013, female (Korea: Gyeongsangbuk-do); Figs. 30 – 31, same species, female (Taiwan: Nantou County). Scale in mm.

FIGURES 32 – 40. External male genitalia of Arocatus nanus (Breddin, 1900) (Figs. 32 – 36) and Thunbergia cf. marginata (Thunberg, 1822) (Figs. 37 – 40). Figs. 32 and 37, genital capsules, posterior view; Figs. 33 – 36 and 38 – 40, left parameres, different aspects. Lettering: cs = cuplike sclerite. Scales in mm.