Miridiba (Pledina) sinensis ( Hope, 1842 )

Li, Chun-Lin, Yang, Ping-Shih & Wang, Chuan-Chan, 2015, A review of the genus Miridiba Reitter (Coleoptera: Scarabaeidae: Melolonthinae) of Taiwan, Zootaxa 3955 (4), pp. 521-536 : 533-535

Miridiba (Pledina) sinensis ( Hope, 1842)

Figs. 6 , 12 , 18, 24, 39, 40

Holotrichia sinensis Hope, 1842: 60 (Type locality: Chusan (presently Zhoushan, Zhejiang Prov.), China. Type not examined); Hope 1845: 8 (redescription, type locality stated); Smetana & Král 2006: 219 (catalog).

Ancylonycha sinae Blanchard, 1851: 139 . Synonymized by Burmeister (1855: 316).

Rhizotrogus cribellatus Fairmaire, 1891: 200 . Synonymized by Keith (2006: 43).

Specimens examined. TAIWAN. New Taipei City (formerly Taipei County): Sheng Ken, 16/VI/1982, C.-L. Li (1 male, CCLI); Lin Kou, 21/V/1993, C.-C. Chen (1 male, CCLI); Ba Li, 23/VI/1993, I.-S. Hsu (3 males, CCLI); Kwan In Shan, 2/VI/1993, I.-S. Hsu (2 males and 1 female, CCLI). Taoyuan County: Da Wan, N. Crossing Hwy, 23/V/2003, C.-L. Li (1 male, CCLI); Yangmei, May 23, 1972, B-S. Chang. Nantou County: Lienhuachih, V/2–VI/ 12/2001, C.-S. Lin & W.-T. Yang, Malaise trap (KCN) (2 males, NMNS); same locality, VI/10–VII/12/2004, C.-S. Lin & W.-T. Yang, Malaise trap (KCN) (2 males, NMNS); same locality, VI/10–VII/7/2003, C.-S. Lin & W.-T. Yang, Malaise trap (KCN) (1 male, NMNS); same locality, VII/7–VIII/14/2003 ,, C.-S. Lin & W.-T. Yang, Malaise trap (KCN) (1 male, NMNS); same locality, V/5/2004, S.-M. Chan, Sweeping Net (1 male, NMNS); Taichung County: Tatu Juiching Village, No.1 Sampling Plots, IV/27–VII/20/2007, C.-S. Lin & W.-T. Yang, Malaise trap (KCN) (1 male, 1 female, NMNS); Kaoshiung County: Maolin, 12/V/1991, C.-K. Yu (1 male, 1 female, CCLI). Pingtung County: Kentine, K. Botan. Garden, 22–25/V/1989, C.-S. Lin, Light Trap (2 males, NMNS); Manchou Nanjensahn, IV/29–V/17/2009, M.-L. Jeng & T.-R. Chen, Flight Intercept Trap (1 male, NMNS). CHINA. Anhui Prov., Hwangshan city, Tanko township, Fuxi, 118.08E, 30.04N, alt. ca. 540 m, by light, 10/July/2014, Collr. J.-Y. Qiu (1 male, CCLI); Jiangxu Prov., Zhongshan Tomb, Zijing Shan, Nanjing city, 118.50E, 32.03N, alt. ca. 113 m, by light, 6/July/2014, Collr. J.-Y. Qiu (1 male, 2 females, CCLI); Hainan Prov. Wuzinshan Nature Reserve HQ, 109.40E, 18.54N, alt. ca 751 m, by light, 18/May/2014, Collr. J.-Y. Qiu (1 female, CCLI).

Redescription. Male ( Fig. 6 ). Body length 19.5–23.0 mm; width across humeri 9.3–11.2 mm. Color dark reddish brown to nearly piceous on head, pronotum, scutellum, venter, and legs; reddish brown to dark rufotestaceous on elytra; weakly shiny. Antennae yellowish brown to dark reddish brown. Body thick with dorsum completely glabrous ( Figs. 6 , 12 , 18). Head: Surface densely punctate, punctures large. Clypeus ( Fig. 7 ) with apex distinctly bilobed and reflexed; lobes obtuse, widened at base. Clypeofrontal suture clearly defined. Basal carina straight, distinctly raised. Antenna with 10 antennomeres, club subequal to length of antennomeres 3–7 combined. Thorax: Pronotum widest at middle; anterolateral angles moderately protuberant ( Fig. 12 ) basolateral angles obtuse, lateral margin weakly serrate to smooth on anterior fifth, moderately reflexed; lateral declivities with distinct gibbosity behind middle; anterior margin completely beaded, basal margin smooth; setiferous punctures deep, large, and evenly distributed. Scutellum triangular, flat; punctures identical to those on pronotum. Prosternal process trapezoidal, slightly raised apically. Elytra: Discal surface densely rugopunctate; sutural costa weakly developed to vestigial. Abdomen: Pygidium wider than long, propygidium and pygidium glabrous. Sternites 1, 2, and 6 with surface densely punctate, sternites 3–5 with moderately distributed, deep punctures; sternites 3–6 almost glabrous with only a row of setae on anterior margin; setae on sternites 3–4 short, on sternites 5–6 intermixed with longer setae. Legs: Protibia tridentate. Profemora and mesofemora moderately covered with long setae, metafemora ( Fig. 24 ) with only a row of robust setae along posterior margin; metafemora moderately broadened anteriorly and posteriorly, weakly convex. Metatibia upper apical spur reaching basal one-fourth of second tarsomere. Genitalia: Parameres asymmetrical, prolonged anteriorly and curved at middle when viewed laterally ( Fig. 39 ); both parameres with an inner leaf-like expansion interlocked at middle in dorsal view ( Fig. 40 ).

Female. Body length 20.1–23.6 mm; width across humeri 9.2–10.8 mm. Antennal club shorter than in male, subequal to length of antennomeres 4–7 combined.

Diagnosis. See diagnosis of M. kuraruana for comparison of species.

Distribution. Taiwan. Northern to southern China: Shangdong, Anhui, Jiangxi, Zhejian, Jiangxu, Fujian, Guangdong, Hainan.

Chinese name. 中華脊頭鰓金龜

Remarks. We have examined several specimens of Miridiba sinensis collected from various places of China and confirmed that the same species occurs in Taiwan. Miridiba sinensis is common in Taiwan and can be found from coast to lower montane areas under 700 m in elevation throughout the western and northwestern part of Taiwan ( Fig. 43 ). Adults of M. sinensis are sympatric with M. formosana and M. kuraruana with an identical temporal distribution from late spring to summer.

Figures

FIGURE 43. Distribution map of Miridiba species in Taiwan: Miridiba kuraruana (open circle), Miridiba formosana (open triangle), Miridiba taipei (black diamond), Miridiba sinensis (open square), and Miridiba huesiotoi and Miridiba taoi indicated by arrow, respectively.

FIGURES 1 – 6. Dorsal habitus of male Miridiba species. 1. Miridiba kuraruana; 2. Miridiba huesiotoi, holotype; 3. Miridiba taoi, holotype; 4. Miridiba formosana; 5. Miridiba taipei, holotype; 6. Miridiba sinensis.

FIGURES 7 – 12. Dorsal view of head and upper half of pronotum of male Miridiba species. 7. Miridiba kuraruana; 8. Miridiba huesiotoi, holotype; 9. Miridiba taoi, holotype; 10. Miridiba formosana; 11. Miridiba taipei, holotype; 12. Miridiba sinensis.

FIGURES 19 – 24. Right metafemur of male Miridiba species. 19. Miridiba kuraruana; 20. Miridiba huesiotoi, n. sp.; 21. Miridiba taoi, n. sp.; 22. Miridiba formosana; 23. Miridiba taipei, n. sp.; 24. Miridiba sinensis.

FIGURES 33 – 40. Parameres of Miridiba species (33, 35, 37, 39, lateral view; 34, 36, 38, 40, dorsal view). 33 – 34. Miridiba taipei; 35 – 36. Miridiba trichophora; 37 – 38. Miridiba hirsute; 39 – 40. Miridiba sinensis. Scale bar = 1.0 mm.