Mesosaimia wakaharai, Yamasako, Junsuke, 2014

Yamasako, Junsuke, 2014, Review of the genus Mesosaimia Breuning with description of a new species (Coleoptera: Cerambycidae: Lamiinae: Mesosini), Zootaxa 3852 (4), pp. 461-474 : 472-473

Mesosaimia wakaharai sp. nov.

( Figs 12–15 , 21–22 , 37–43 , Pl. 1)

Type locality. Laos, Houa Phan Prov., Ban Saleui, Phou Pan (Mt.), 20°12’N, 104°01’E.

Type series. Holotype (Holzschuh Coll., Figs 12–13 , 21 ): ♂, “ NE-LAOS, Hua Phan prov. / Ban Saleui, Phou Pan (Mt.) / ~ 20°12’N, 104°01’E / 1.-15. V. 2010, 1300-1900 m / leg. C. Holzschuh ” Paratypes: 1♀ ( Figs 14–15 , 22 ), same locality as the holotype but Alt. 1,500–1,700 m, 7. V, 2001, Native collector leg .; 1♀, same locality but Alt. 1,500–1,800 m, 23. V, 2004, T Tsuru leg.; 1♀, near Phou Samsoum (Mt.), Xieng Khouang Prov., Laos, IV–VI, 2006, H. Wakahara Coll.; 1♂, same locality and collector as the holotype but Alt. 1,500–1,900 m, 3. VI, 2007; 1♀, same locality and collector, 24. IV, 2010 ; 1♀, same locality and collector, 27. V, 2010 ; 1♂, same locality and collector, 3. V, 2010 ; 1♂ ( Figs 37–43 ), same locality but Alt. 1,200–1,600 m, 31. V, – 11. VI, 2011, St. Jaki & Native collector leg.

Differential diagnosis. This species is similar to M. mausoni , but differentiated by the following structures: body black, with mottled brown, white and black pubescence; antennae shorter than body in female; pronotum with pair of distinct swellings on disk. It is also distinguishable from other congeners by elytral markings mottled brown, white and black pubescence.

Description. Male (n = 4, Figs 12–13 , 21 ): Length from vertex to elytral apices 17.0–21.0 mm, width across humeri 6.3–8.2 mm.

Body black except antennomeres 2–11 that are reddish brown; head, pronotum and elytra with mottled brown, light brown, white and black pubescence; ventral surface with light or whitish brown pubescence. Head with pair of longitudinal black bands on occiput behind upper eye lobes. Antennae with scape clothed with brown pubescence except apical part, scattered with small black spots; pedicel with white pubescence; antennomeres 3–11 annulate with white pubescence on each basal part and the remainders with brown pubescence. Pronotum with pair of longitudinal interrupted narrow black bands on disk, but the bands sometime indistinct. Elytra sparsely scattered with small black spots, with an indistinct transverse wide whitish band on middle, several black patches transversely arranged on basal 1/3 and behind middle. Legs with femora with brown pubescence except apical parts; tibiae with same pubescence on each middle and annulate with black pubescence on each base and apex; tarsi with tarsomeres 1–2 covered with whitish ocher pubescence; tarsomere 3 with black pubescence; claw with whitish ocher pubescence on basal 2/3.

Head with frons having sparse and fine punctures; upper and lower eye lobes connected by 1–2 rows of ommatidia; lower eye lobe 1.0–1.1 times as long as width, 0.7–0.8 times as long as gena. Antennae 1.7–1.8 times as long as body, surpassing elytral apices at base of antennomere 6; scape to antennomere 7 or 8 sparsely fringed beneath by suberect setae that become sparser toward apical segment; antennomere 11 with suberect setae in apical half; relative length of each segment as follows: 1.0–1.1: 0.2: 1.7–1.8: 1.2: 0.9–1.0: 0.9: 0.8–0.9: 0.7–0.8: 0.7–0.8: 0.7–0.8: 0.8. Pronotum widest near middle, 0.7–0.8 times as long as width, 0.7 times as wide as elytral humeri; disk with pair of distinct swellings, with sparse and fine punctures indistinct in apical half, distinct and umbilicate in basal half. Elytra 0.6–0.7 times as long as body length, 1.7 times as long as humeral width, provided with granules in basal 1/5, weakly swollen longitudinally near middle behind base, with sparse punctures distinct in basal half, reduced apically and almost disappearing in apical 1/3; sides almost straight toward apical 1/3, arcuately narrowed apically; apex rounded with sub-quadrate inner angle.

Male genitalia (n = 2, Figs 37–43 ): Tegmen with lateral lobe about 1/5 times as long as the total length of tegmen, widest at base, gently narrowed toward apical half, slightly dilated toward rounded apex, with setae that arise from apical half of latero-dorsal side, denser and longer apically, concentrated near apex, with minute setae on basal part of ventral side. Median lobe with apex acuminate in ventral view; median struts dehiscent from just behind middle. Endophallus slightly shorter than triple length of median lobe; BPH slightly longer than half length of median lobe; MT+CT about 1.5 times as long as median lobe; PB about half length of median lobe. MT+CT strongly curved dorsally in basal 1/5 thence reflexed ventrally; PB swollen in bullet shape together with APH; APH rudimentary. MSp evenly distributed in apical half of MT+CT; LSp evenly and densely arranged from basal half to basal 1/5 of MT+CT; SSp evenly and densely covered almost area of PB.

Female (n = 5, Figs 14–15 , 22 ): Length from vertex to elytral apices 16.0– 19.5 mm, width across humeri 5.8–7.7 mm.

Similar to male, but body more rotund. Head with lower eye lobe 1.0–1.1 times as long as width, 0.7–0.8 times as long as gena. Antennae 0.9 times as long as body length; scape to antennomeres 5 or 6 sparsely fringed beneath by suberect short setae; antennomere 11 short and bullet shaped; relative length of each segment as follows: 1.8–1.9: 0.3: 2.4–2.6: 1.5–1.6: 0.8–0.9: 0.6–0.7: 0.5: 0.5: 0.4: 0.4: 0.4.

Etymology. The specific name is dedicated to Mr. Hiroyuki Wakahara (Vientiane, Laos) who first provided the material of this species for the present study.

Distribution (Pl. 1). Laos (Houa Phan Prov. and Xieng Khouang Prov.)

Figures

FIGURES 9 – 15. Habitus of Mesosaimia spp. 9. Mesosaimia similis (male, holotype); 10 – 11. M. mausoni (female, holotype); 12 – 13. M. wakaharai (male, holotype); 14 – 15. ditto (female, paratype); 9, 10, 12, 14. dorsal view; 11, 13, 15. lateral view.

FIGURES 16 – 22. Frontal views of Mesosaimia spp. 16 – 17. Mesosaimia robusta; 18 – 19. M. similis; 20. M. mausoni; 21 – 22. M. wakaharai; 16, 18, 21. male; 17, 19, 20, 22. female; 16. lectotype, 17. paralectotype, 20, 21. holotype; 22. paratype.

FIGURES 37 – 43. Male genitalia of Mesosaimia wakaharai sp. nov. (paratype). 37. Tegmen in dorsal view; 38. ditto in lateral view; 39. lateral lobes in ventral view; 40. median lobe with CS in dorsal view; 41. ditto in lateral view; 42. apex of median lobe in ventral view; 43. median lobe with fully inflated endophallus without eversion in lateral view. Scale = 1.0 mm. See text for abbreviations.