Rhinoncomimus niger Chûjô and Morimoto, 1959

Huang, Junhao, Yoshitake, Hiraku, Zhang, Runzhi & Ito, Motomi, 2013, Taxonomic Review of the Genus Rhinoncomimus (Coleoptera: Curculionidae: Ceutorhynchinae) with description of a new species from Yunnan, China, Zootaxa 3750 (2), pp. 143-166 : 157-159

Rhinoncomimus niger Chûjô and Morimoto, 1959

( Figs. 5–6 , 23–24 , 54–61 , 62–69 , 70–79 , 80 )

Rhinoncomimus niger Chûjô and Morimoto, 1959: 287 (type locality: Japan, Sendai, Shimokita).—Yoshitake et al., 2004: 105 (in checklist).—Korotyaev, 2004: 107

Supplementary description. Male. LB: 2.30–2.89 (mean, 2.60). LR: 0.70–0.82 (mean, 0.76). LP: 0.76–0.95 (mean, 0.83). N = 13 for all measurements. Male genitalia. Spiculum gastrale (sternite IX; Figs. 58 , 66 ) robust, evidently longer than the penis or its apodeme, bent leftward. Tegmen ( Figs. 57 , 65 ) with apodeme short and robust, nearly 0.3 times as long as the diameter of the tegminal ring, more or less widened toward the apex. Penis ( Figs. 54–56 , 62–64 ) relatively broad and robust, relatively thick in profile, more or less moderately curved downward in the basal 1/3, then slightly bent upward in the apical 1/3; sides subparallel in basal half, then gradually convergent apically; apical projection ( Figs. 55 , 63 , 70, 72, 74, 76, 78 ) rounded at apex. Basal part of the endophallus ( Figs. 54 , 62 ) with a pair of large plate-like sclerites in the base, numerous moderately dense minute spicules in the median part, and several smaller plate-like sclerites in apical part.

Female. LB: 2.64–3.02 (mean, 2.83). LR: 0.76–0.88 (mean, 0.82). LP: 0.84–0.96 (mean, 0.89). N = 11 for all measurements. Female genitalia. Sternite VIII ( Figs. 59 , 67 ) with a pair of patches of several minute setae near the apex; arms relatively broad, nearly as long as apodemes, slightly shorter than the coxite and stylus combined, moderately basally fused, and apically subparallel; apodemes slender, moderately divergent near the apex. Coxites ( Figs. 60 , 68 ) robust, nearly five times longer than styli; styli apicolaterally inserted, long and slender, nearly four times longer than wide. Spermatheca ( Figs. 61 , 69 , 71, 73, 75, 77, 79 ) with cornu slender, strongly curved and weakly attenuate; collum strongly convex; ramus distinct; insertions of the duct and gland relatively distant to each other.

Specimens examined. Paratype. 1 male, (Honshu) / Yunomata / Oohata-machi / Shimokita Pen./ 29 vii. 1956 / K. Morimoto / Paratype male / Rhinoncomimus niger Chûjô et Morimoto 1959 (NIAES). CHINA. JIANGXI. 1 female, Zixi, Yangjiangling, VIII. 2003, Wen et al. (NIAES). HUNAN. 2 males and 2 females, Hunan, Pingjiang, Mt. Mupushan, bordering on Jiangxi, 1600 m, 1–12-VIII-2003, Li et al. (NIAES). 5 males and 3 females, Hunan, Hengshan, Mt. Hengshan, 1500 m, VIII. 2003 Wu et al. (NIAES). GUANGDONG. 33 males and 40 females, Liannan, Mt. Liannanshan, 1800m, VIII. 2003, Wen et al. (NIAES). GUIZHOU. 2 males and 2 females, Mt. Leigongshan, Lianhuaping, 31-V-2005, J. Liu, IOZ(E)985717–985720 (IZCAS). 1 male, Mt. Leigongshan, Xiaodanjiang, 4–5-VI-2005, D. Ge, IOZ(E)985716 (IZCAS). 10 males and 6 females, Suiyang, Kuankuoshui, Xiangguangshan, 4-VI-2010, Z. Wang, IOZ(E) 1784670, 1784673, 1784683, 1784684, 1784693, 1802484, 1802485, 1802487, 1803011, 1803013, 1803015, 1803017, 1803018, 1803023, 1803026, 1803532 (IZCAS). JAPAN. 2 males and 1 female, Honshu, Yunomat, Oohata-machi, Shimokita Pen., 29 vii. 1956, K. Morimoto (NIAES). 2 males and 6 females, Miyaki, Sendai, Shimoayashi, 10-VIII-1995, H. Yoshitake (NIAES). 5 males and 5 females, Miyaki, Sendai, Shimoayashi, 12-VIII-1995, H. Yoshitake (NIAES). 2 males, Honshu, Kyoto, Kifune, 6-VIII-1980, K. Morimoto (NIAES). 2 males and 1 female, Tottori, Mt. Daisen, 800–1000 m, 9-VI-1981, H. Takemoto (NIAES). Kyushu, Oita, Kuju Mts., Kyusuikei: 1 male and 1 female, 10–12-VI-2003, H. Yoshitake (NIAES); 13 males and 14 females, 5-VI-2004, H. Yoshitake (NIAES).

Distribution. China (Jiangxi, Hunan, Guangdong, Guizhou— new record), Japan.

Biological notes. Plant association remains unknown.

Remarks. The species shows similarity to Rh. klapperichi , Rh. continuus and Rh. robustus in external morphology but can be easily differentiated by its black vestiture without white lanceolate scales on the elytra and the mucro developed only on the male mesotibia. The species is quite common in southern China and long series of specimens were examined from various localities in Japan and China. The specimens show considerable variation in external morphology, including length and width of rostrum, shape of elytra, sculpture of intervals and color of different parts of the body; however, no distinct variation was observed in the male and female genitalia of the specimens from northern Japan to southern China ( Figs. 70–79 ).

Figures

FIGURE 80. Geographic distributions of Rhinoncomimus niger and Rh. rubripes.

FIGURES 5 – 8. Habitus of Rhinoncomimus spp., males. (5 – 6) Rh. niger. (7 – 8) Rh. robustus. (5, 7) Dorsal habitus. (6, 8) Lateral habitus. Scale bars: 0.50 mm.

FIGURES 13 – 24. Heads of Rhinoncomimus spp. (13 – 16) Rh. klapperichi. (17 - 20) Rh. latipes. (21 – 22) Rh. continuus. (23 – 24) Rh. niger. (13 – 14, 17 – 18, 21 – - 22, 23 – 24) Males. (15 – 16, 19 – 20) Females. (13, 15, 17, 19, 21, 23) Dorsal view. (14, 16, 18, 20, 22, 24) Lateral view. Scale bars: 0.50 mm.

FIGURES 54 – 61. Male and female terminalia of Rhinoncomimus niger from Aomori, Japan. (54 – 68) Male. (54) Penis, dorsal view. (55) Apex of the penis, dorsal view. (56) Penis, lateral view. (57) Tegmen. (58) Sternites VIII and IX. (59 – 61) Female. (59) Sternite VIII. (60) Coxite and stylus. (61) Spermatheca. Scale bar: 0.20 mm for 54 – 59, 0.10 mm for 60 – 61.

FIGURES 62 – 69. Male and female genitalia of Rhinoncomimus niger from Guangdong, China. (62 – 66) Male. (62) Penis, dorsal view. (63) Apex of the penis, dorsal view. (64) Penis, lateral view. (65) Tegmen. (66) Sternites VIII and IX. (67 – 69) Female. (67) Sternite VIII. (68) Coxite and stylus. (69) Spermatheca. Scale bar: 0.20 mm for 62 – 67, 0.10 mm for 68 – 69.

FIGURES 70 – 79. Apex of penis and spermatheca of Rhinoncomimus niger from various localities. (70 – 71) Aomori, Japan. (72 – 73) Sendai, Japan. (74 – 75) Kyushu, Japan. (76 – 77) Hunan, China. (78 – 79) Guangdong. (70, 72, 74, 76, 78) Apex of penis, dorsal view. (71, 73, 75, 77, 79) Spermatheca. Scale bar: 0.10 mm for 70, 72, 74, 76, 78; 0.20 mm for 71, 73, 75, 77, 79.