Cybocephalus (Cybocephalus) politissimus Reitter, 1898

Hisamatsu, Sadatomo, 2013, A review of the Japanese Cybocephalidae (Coleoptera: Cucujoidea), Zootaxa 3616 (3), pp. 253-267 : 259-262

Cybocephalus (Cybocephalus) politissimus Reitter, 1898

Figs 1 B, 3C–D, 5, 6

Cybocephalus politissimus Reitter, 1898: 117 . Type locality: Irkut in Ostsibirien.

Cybocephalus politissimus: Endrödy-Younga, 1968: 77 [redescription, figure];—Kirejtshuk, 1992: 209 [in key, figure].

Cybocephalus (Cybocephalus) politissimus: Jelínek & Audisio, 2007: 490 [catalogue].

Cybocephalus flavicapitus Tian & Yu, 1994b: 209. Type locality: Shixing, Guangdong Province, China. Synonymized by Kirejtshuk & Fallahzadeh, 2008: 85.

Cybocephalus flavocapitis Smith & Bailey, 2007: 504 . Type locality: Kenting, Taiwan, syn. nov.

Specimens examined. TAIWAN [TAINAN] 1 ex., Kuantzuling, 28. V. 1969, S. Hisamatsu leg. [NANTOU] 1 ex., Wushe, 24. V. 1972, M. Sakai leg. JAPAN [MIYAGI] 1 ex., Takiyama Park, Yamoto-chô, 2. VIII. 2009, T. Ozaki leg. [TOKYO] 3 exs., Izu-oshima Is., 19. V. 1974, Y. Hirano leg.; 1 ex., Niisima, 21. VI. 1992, Y. Hirano leg. [KANAGAWA] 2 exs., Odawara, 9. V. 1957, Y. Hirano leg.; 1 ex., Oishi, 8. IX. 1979, Y. Hirano leg.; 2 exs., Sarugashima, Atsugi City, 25. IV. 1996, Y. Hirano leg.; 1 ex., Tanzawa, 18. V. 1986, Y. Hirano leg.; 1 ex., Myoshintoge, 12. VIII. 1993, Y. Hirano leg.; 1 ex., Sengoku, Hakone, 4. VII. 1992, Y. Hirano leg.; 1 ex., Odawara, Kuno, 9. V. 1957, Y. Hirano leg.; 1 ex., Kamitsuruma 1 chôme, Sagamihara City, 20. IX. 1997, R. Iwata leg. [SHIMANE] 1 ex., Yoshiji-chô, Hamada City, 14. V. 1996, Y. Hirano leg. [EHIME] 12 exs., Kurotaki, nr. Matsuyama City, 18. V. 1958, M. Miyatake leg.; 1 ex., Mt. Sara, 16. V. 1968, M. Sakai leg.; 1 ex., Hantaji, Matsuyama City, 4. V. 1974, K. Ito leg.; 1 ex., Yama-jinjya, Matsuyama City, 23. V. 1973, K. Ito leg.; 1 ex., Tarumi, Matsuyama City, 22. VII. 1995, N. Ohbayashi leg. [KUMAMOTO] 1 ex., Mt. Ichibusa, 9. VI. 1967, S. Hisamatsu leg. [NAGASAKI] 1 ex., Mogi, 20. V. 1971, S. Hisamatsu leg.; 1 ex., Chiziwa, 10. XI. 1965, S. Nakao leg. [KAGOSHIMA] 2 exs., Amagi, Tokunoshima Is., 18. X. 1965, S. Nakao leg.; 2 exs., Mugio, Yaku-chô, 18. III. 1974, TK. Ishihara leg. [OKINAWA] 1 ex., Sueyoshi Park, Naha City, 8. III. 2003, Y. Kikuhara leg.; 2 exs., Syuri, 17. V. 1989, Y. Hirano leg.; 2 exs., Omoto, Ishigaki Is., 27. II. 1993, Y. Hirano leg.; 2 exs., Uegusuku, Kumejima Is., 21. IX. 2001, Y. Hirano leg.; 1 ex., Darumayama, Kumejima Is., 21. IX. 2001, Y. Hirano leg.; 1 ex., Oku, Kunigami-son, 4. IV. 2002, Y. Hirano leg.; 1 ex., Yamada, Onnason, 19. IV. 2009, Y. Hirano leg.; 4 exs., Miyako Is., 5~ 7. V. 1998, M. Satô leg.

Diagnosis. The species is distinguished from other Japanese congeners by the following characteristics: disc of elytra smooth or shagreened; males with yellow head and black pronotum; punctures on elytra ( Figs. 3 C–D) smaller than an eye-facet at middle; apical margin of median lobe ( Fig. 5 K–O) in ventral view with strongly acute projection at middle.

Redescription. Length 1.24–1.62 (1.43) mm (n = 7), width 0.70–0.82 (0.76) mm (n = 5), height 0.40–0.56 (0.49) mm (n = 7).

Male. Body convex; dorsal disc almost glabrous, shiny. Coloration black; dorsal- and ventral side of head (excluding blackish mandibles and apical half of genae), antennae, lateral margins of pronotum, mesoventrite, pro- and mesothoracic legs (excluding blackish mesotibiae) yellow; lateral margins and posterior corners of pronotum, anterior margins of elytra translucent, yellowish brown; hind legs dark yellowish brown.

Head extremely wide; vertex minutely punctured; interspaces smooth or shagreened; labrum transverse, with apical margin shallowly emarginate at middle. Eyes large, visible from ventral aspect. Antennae ( Fig. 6 F) similar to those of C. (C.) nipponicus ; club 3-segmented, apical margin of eleventh antennal segment truncate; approximate ratio of each segment (n = 1) is 2.13: 1.65: 1.87: 1.13: 1.25: 1.06: 1.06: 1.00: 1.37: 1.52: 1.40.

Pronotum convex, strongly transverse, 1.67–1.73 (1.71) times as wide as long (n = 5); anterior angles rounded; posterior angles widely rounded; dorsal disc minutely punctated; interspaces smooth or shagreened. Scutellum with apex broadly rounded.

Elytra conjointly 0.86–0.97 (0.92) times as long as wide (n = 5), 1.50–1.73 (1.60) times as long as pronotum (n = 5); disc ( Figs. 3 C–D) with two kinds of punctures, one large, but smaller than an eye-facet, the larger one possessing two lateral extensions and an associated recumbent seta; the other puncture minute; interspaces smooth or shagreened. Metaventrite convex, densely covered with long, recumbent yellowish setae, but without setae at basal areas. Inter-metacoxal distance wide, separated by 1.50 (1.50) times as wide as inter- mesocoxal distance (n = 2). Abdominal sternites densely covered with long, recumbent yellowish setae; inter-metacoxal area of abdominal sternite III with widely rounded apical margin; femoral lines joined with anterior margin of abdominal sternite III. Legs ( Fig. 6 C–E) rather slim and flat, similar to those of C. (C.) nipponicus ; protibiae ( Fig. 6 C) with slightly sinuate inner margins, outer apical corner rounded. Claws simple.

Male genitalia ( Fig. 5 ) with some local variations in shape (see ‘Note’ below); tegmen strongly or uniformly attenuate, scattered with sparse setae at apical margin; median lobe in lateral view strongly thickened, more or less square in shape with strongly acute projection at middle of apical margin in ventral aspect. Internal sac sclerites of male genitalia as figured ( Fig. 5 A–E).

Female. Coloration of head black. Apical margin of abdominal tergite and sternite VII rounded. Female genitalia ( Fig. 6 G) similar to those of C. (C.) nipponicus ; coxites feebly sclerotized, appearing separate and unfused, with short styli near apex; apex of stylus with 2~3 setae; 9~10 setae present along apico-lateral margin; spermatheca ( Fig. 6 A) oval, sclerotized; spermathecal gland long, curved, weakly sclerotized; sperm duct coiled.

Bionomics. According to Smith & Bailey (2007), this species feeds upon Aulacaspis yasumatsui Takagi. Distribution. This species occurs in Europe ( France, Germany, Italy), Russia (East and West Siberia, Far East), China (Guangdong) (Jelínek & Audisio 2007), Taiwan (new record), and Japan (new record).

Taxonomy. Cybocephalus (C.) flavocapitis Smith, 2007 is treated herein as a junior synonym of C. (C.) politissimus . Japanese and Taiwanese specimens of C. (C.) politissimus were compared with type specimens of C. (C.) flavocapitis by Dr. T.R. Smith, and he agrees with this emendation (Smith pers. comm.). Cybocephalus (C.) flavocapitis and C. (C.) politissimus share the following characteristics: head yellowish; apical margin of eleventhantennal segment truncated; tegmen in ventral view more or less attenuate; median lobe in lateral view strongly truncate, in ventral view apical margin with strongly acute projection at middle; internal sac sclerites of same shape. Based on these characteristics, C. (C.) flavocapitis should be treated as a junior synonym of C. (C.) politissimus .

Note. This species has some variation in the shape of the male genitalia ( Fig. 5 ) and punctation of the dorsal surface ( Fig. 3 C–D). Nevertheless, the basic structure of the male genitalia is identical, especially the thickened median lobe (in lateral aspect) and shape of the internal sac sclerites. Therefore, these variable anatomical features should be considered as intraspecific variation. Coloration of the male pronotum is usually black, but rarely becoming yellowish brown.

Figures

FIGURE 1. Lateral habitus of Cybocephalidae spp. A, Cybocephalus (C.) nipponicus Endrödy-Younga, 1971 (male, Tokunomori, Ehime Pref.); B, Cybocephalus (C.) politissimus Reitter, 1898 (male, Yoshiji-chô, Shimane Pref.); C, Cybocephalus (C.) chlorocapitis sp. nov. (holotype, male, Amami Is.); D, Pastillus eminentithorax sp. nov. (paratype, female, Araike, Aichi Pref.). Scale bars = 1 mm.

FIGURE 3. Elytral punctuation of Pastillus eminentithorax sp. nov. and Cybocephalus (Cybocephalus) spp. A, Pastillus eminentithorax sp. nov.; B, Cybocephalus (C.) nipponicus Endrödy-Younga, 1971; C, D, Cybocephalus (C.) politissimus Reitter, 1898. A = female, Mt. Haigamine, Hiroshima Pref.; B = male, Morimatsu, Ehime Pref.; C = male, Yakushima Is.; D = male, Sugitate, Ehime Pref.

FIGURE 5. Male genitalia of Cybocephalus (C.) politissimus Reitter, 1898. A – E, sclerite of internal sac; F – J, tegmen, ventral view; K – O, median lobe, ventral view; P – T, median lobe, lateral view. A, F, K, P = Kurotaki, Ehime Pref.; B, G, L, Q = Mt. Ichibusa, Kumamoto Pref.; C, H, M, R = Tokunoshima Is.; D, I, N, S = Onna-son, Okinawa Pref.; E, J, O, T = Kuantzuling, Taiwan. Scale bars = 0.1 mm.

FIGURE 6. Cybocephalus (C.) politissimus Reitter, 1898. A, spermatheca, spermathecal gland, and sperm duct; B, labrum; C, left protibia; D, left mesotibia; E, left metatibia; F, antenna; G, ovipositor; H, mentum. A, G = Mt. Sara, Ehime Pref.; C – F = Kuantzuling, Taiwan; B, H = Kurotaki, Ehime Pref. Scale bars = 0.1 mm.