Bobina cuspidenta, Li & Ren, 2019

Li, Zhaoxu & Ren, Guodong, 2019, Two new species of comb-clawed beetles (Coleoptera: Tenebrionidae: Alleculinae) from Yunnan, China, Zootaxa 4576 (1), pp. 162-170 : 164-165

Bobina cuspidenta sp. nov.

Figs. 1–7

Type depository. MHBU and IZCAS .

Type material. Holotype: ♂ ( MHBU): with the following labels: “ 2012-VII-23 ~27 // 云南高黎贡山 // 2000 m 徐吉 山 常凌小 // 河北大学博物馆 ” translated into English as “ 2012-VII-23 ~27 // Gaoligong Mountains , Yunnan // 2000 m, Jishan Xu & Lingxiao Chang leg. // Museum of Hebei University” (white, printed, in Chinese) . Paratypes: 1 ♂ ( MHBU) with the same labels as the holotype . 2 ♀ ( IZCAS) with the following labels: “ 2003-X-17 // 云南腾冲上营乡大营坪 // 灯诱 梁宏斌 // 中科院动物所 ” translated into English as “ 2003-X-17 // Dayingping, Shangying Township, Yunnan // light trap, Hongbin Liang leg. // Chinese Academy of Science, Institute of Zoology ” (white, printed, in Chinese) . 2 ♀ ( IZCAS) with the following labels: “ 2003-X-18 // 云南腾冲上营乡 // 灯诱 梁宏斌 // 中科院动物所 ” translated into English as “ 2003-X-18 // Shangying Township, Yunnan // light trap, Hongbin Liang leg. // Chinese Academy of Science, Institute of Zoology ” (white, printed, in Chinese).. “ HOLOTYPE (and PARATYPE respectively) // Bobina cuspidenta Li & Ren det. 2016” (red for the holotype and yellow for paratypes, respectively, printed and handwritten) .

Description. Habitus of male holotype presented on Fig. 1 . Body elongate (13.28 mm), dark brown, shiny. Labrum and anterior part of clypeus pale brown, posterior part dark brown. Maxillary palpomeres II and III dark brown, with a pale brown narrow ring at apex.

Head ( Fig. 2 ). Transverse, HL 1.54 mm, HW 2.06 mm. Head widest across eyes, with sparse setae, punctuation and microgranulation. Anterior margin of labrum and clypeus straight. Eyes large (OI=19.28), transverse, distinctly emarginate. Space between eyes narrower than diameter of single eye. Impression between eyes shallow. Maxillary palpi ( Fig. 3 ) with short, pale brown setae and microgranulation; palpomere II and penultimate palpomere with few long setae on apex. Palpomere II and ultimate palpomere longer than penultimate palpomere. Ultimate palpomere long and triangular in shape.

Antennae ( Fig. 2 ). Filiform, reaching two third body length. Each antennomere bicolored, with pale setae and microgranulation. Antennomere II shortest, antennomeres IV–XI distinctly longer than antennomere III. RLA: 1.11: 0.37: 1.00: 2.01: 1.94: 1.90: 1.90: 1.83: 1.70: 1.65: 1.63. RL/WA: 2.13: 1.01: 2.88: 5.24: 5.55: 4.87: 5.73: 4.84: 5.28: 5.28: 4.94.

Pronotum ( Fig. 2 ). Nearly trapezoid, longest along midline (PL 1.83 mm), widest at base (PW 3.64 mm), PI=50.27. Surface with dense setae, punctures and microgranulation. Setae on pronotum longer than head. Punctures on pronotum shallow and sparser than punctures on head. Interspace between punctures larger than diameter of punctures. Lateral and posterior borders of pronotum complete. Middle of anterior borders inconspicuous. Anterior margin distinctly curved backward, lateral margins regularly narrowing from base to apex, posterior margin slightly bisinuate. Anterior angles rounded, obtuse; posterior angles distinctly sharp.

Elytra shiny, widest in half, EL 9.91 mm, EW 4.29 mm. Elytral striae with rows composed of deep, large-sized punctures, separated by single diameter. Elytral intervals convex, surface with sparse punctuation and microgranulation. Each elytron terminated separately with a distinct sharp extension at apex (as in Fig. 4 ). Elytral epipleura well-developed, regularly narrowing to metasternum, then narrowly parallel. Scutellum small, broad inverted triangle, with apex rounded.

Ventral side of body shiny, with dense, pale brown setae and shallow punctures. Ventrites II–IV with shallow depressions laterally.

Legs slender, general setation, surface sculpturing. All femora normal. Protibiae ( Fig. 5 ) slightly bent on inner side near base. Meso- and metatibiae straight. Pro- and mesotarsomeres III and IV and metatarsomere III of each tarsus distinctly widened with membranous lobes. RLT: 1.00: 0.86: 0.55: 0.39: 2.91 (protarsus), 1.00: 0.67: 0.47: 0.21: 1.73 (mesotarsus), 1.00: 0.35: 0.09: 0.60 (metatarsus). Pro-, meso- and metatarsal claws with 30, 23, 20 visible teeth respectively.

Aedeagus ( Figs. 6–8 ). Long (6.80 mm), dark brown. Phallobase slightly rounded laterally and narrowing to apex dorsally, 6.34 times longer than parameres. Parameres ( Figs. 9–11 ) narrowing from base to apex, widened and flat at apex.

Female. Body longer than males (13.03 mm). Space between eyes broader than in males. Setae on dorsal surface sparser than in males. Protibiae straight.

Variability. The type specimens have some variation in size; each characteristic is given as its mean, with full range in parentheses. Males (n = 2). BL 13.49 mm (13.28–13.70 mm); HL 1.56 mm (1.54–1.58 mm); HW 2.05 mm (2.04–2.06 mm); OI=18.73 (18.19–19.28); PL= 1.88 mm (1.83–1.94 mm); PW= 3.63 mm (3.62–3.64 mm); PI=51.93 (50.27–53.59); EL 10.04 mm (9.91–10.18 mm); EW 4.26 mm (4.23–4.29 mm). Females (n = 4). BL 13.03 mm (12.30–13.73 mm); HL 1.50 mm (1.35–1.70 mm); HW 2.16 mm (1.97–2.24 mm); OI=38.30 (37.93– 39.27); PL= 1.90 mm (1.81–1.96 mm); PW= 4.06 mm (3.82–4.33 mm); PI=46.84 (45.26–47.62); EL 10.39 mm (9.92–11.23 mm); EW 4.90 mm (4.63–5.25 mm).

Diagnosis. This new species can be recognized by bicolored antennomeres; elytra with short apical extensions at apex; male protibiae bent on inner side near base; and long aedeagus (length of aedeagus nearly half of body length).

This new species is similar to B. masumotoi Novák, 2012 due to bicolor antennae. B. cuspidenta differs from B. masumotoi mainly by the following characters: males of B. cuspidenta have larger body (BL= 13.49 mm); dull dorsal surface; anterior margin of pronotum distinctly curved backward, posterior angles of pronotum sharp and protibiae distinctly bent near base. While B. masumotoi has a shorther body (BL=ca. 9 mm); distinctly shiny dorsal surface of the body; anterior margin of pronotum approximately straight, posterior angles of pronotum slightly rounded and protibiae only very slightly bent in posterior part. Because the name-bearing type specimen of B. masumotoi is a female, differences between females should also be discussed. Females of B. cuspidenta have bicolored antennomeres (basal three quarters of antennomeres IV–XI are dark brown and apical fourth is pale brown); eyes are not connected with anterior margin of pronotum in the dorsal view; maxillary palpomeres II and III dark brown with a pale brown narrow ring at apex; pronotum more transverse, PI relatively high (PI=46.84), with sparse setae laterally and disc glabrous; dorsal surface of elytra with sparse setae. While females of B. masumotoi have pale brown antennomeres I–III, bicolored antennomeres IV–XI (two thirds from base blackishbrown, apical third pale brown); eyes connected with anterior margin of pronotum in dorsal view; maxillary palpomeres II and III pale brown, ultimate palpomere blackish-brown; pronotum less transverse, PI relatively small (PI=37.24); dorsal surface of pronotum and elytra with dense setae. For further details see the key above.

Etymology. From the Latin “ cuspis ” and “ dentata ”, referring to the elytral sharp apical extensions.

Distribution. China (Yunnan).

Figures

FIGURES 1–11. Bobina cuspidenta sp. nov., male. 1. Habitus, dorsal view. 2. Head and pronotum, dorsal view. 3. Maxillary palpi, ventral view. 4. Apex of elytra, dorsal view. 5. Protibia, left, ventral view. 6–8. Aedeagus, dorsal, ventral and lateral view. 9–11. Parameres, dorsal, ventral and lateral view.