Ptomaphaginus yui, Wang, Cheng-Bin & Zhou, Hong-Zhang, 2015

Wang, Cheng-Bin & Zhou, Hong-Zhang, 2015, Taxonomy of the genus Ptomaphaginus Portevin (Coleoptera: Leiodidae: Cholevinae: Ptomaphagini) from China, with description of eleven new species, Zootaxa 3941 (3), pp. 301-338 : 334-336

Ptomaphaginus yui sp. nov.

( Figs. 19 A–K)

Type material. Holotype: CHINA, Yunnan: ♂, Lijiang, Yulong Snow Mountain Nature Reserve, 2980 m, pine forest, pitfall trap, 1–3.VIII.2000, Xiao-Dong Yu & Hong-Zhang Zhou legg. (IZ-CAS). Paratypes: 1♀, same data as holotype (IZ-CAS); 1♂, Zhongdian County, south of Gezaxiang, 3080 m, pine forest, pitfall trap, 23–25.VII.2000, Xiao-Dong Yu & Hong-Zhang Zhou legg. (IZ-CAS).

Description. Male. EBL: 2.75 mm. Length of different body parts: HL: AL: PL: ELL = 0.42: 0.74: 0.62: 1.58 mm; width: HW: EW: PW: ELW = 0.74: 0.08: 1.06: 1.13 mm. Proportion of antennomeres from base to tip in µm (length × width): 122 × 35, 101 × 45, 63 × 42, 40 × 41, 42 × 49, 31 × 56, 52 × 69, 24 × 73, 50 × 82, 53 × 87, 103 × 101.

Habitus elongated oval, relatively convex and lustreless. Well pigmented: mostly dark brown, head blackish; mouthparts, basal six antennomeres and apical half of ultimate antennomere, base of pronotum, elytral apex, and tarsi somewhat yellowish. Dorsum continually clothed with fine, recumbent and sallow pubescence. Insertions of pubescence on dorsal surfaces of head, pronotum, scutellum, elytra and femora align along transverse striolations.

Head short and convex, transversely striolated, interspaces narrower than that on pronotum, HW/HL = 1.75; anterior margin round. Compound eyes normally developed, EW/HW = 0.11. Antennae slender but not very long ( Fig. 19 A), AL/HW = 1.00; 5th slightly longer than 4th; 6th distinctly wider than long; 7th a little wider than long; 9th and 10th wider than long; 11th wide, peach-like.

Pronotum moderately transverse and convex ( Fig. 19 E), widest just before hind corners, PW/PL = 1.72. Sides slightly curved, narrowing from posterior to anterior; hind corners drawn out and bluntly rounded. Posterior margin with distinct postero-lateral emargination. Surface transversely striolated, SP: 39–41, interspaces as wide as that on elytra.

Elytra relatively long and convex, widest at basal 1/5, ELL/EW = 1.40. Sides feebly curved, gradually narrowing from base to apices; apices nearly rounded ( Fig. 19 F). Surface transversely striolated, SE: 80–84. Metathoracic wings fully developed.

Prolegs robust, with basal three protarsomeres moderately expanded ( Fig. 19 B): TW/BTW = 1.41. Spinal arrangement on ventral side of protibia as shown in Fig. 19 D. Profemora wider than protibiae. Pubescence on ventral side of profemora similar to that of protibiae. Mesotibiae moderately arcuate.

Ventrite VII simple. Ventrite VIII regularly rounded posteriorly. Segment IX: spiculum gastrale slender, distinctly constricted at middle and flared at posterior end ( Fig. 19 G).

Aedeagus suboval in dorsal view ( Fig. 19 H): median lobe gradually but distinctly narrowing towards the slightly asymmetrical apex; right apical expansion only stuck out of apical margin of median lobe a little bit; parameres relatively narrow, firmly attached to median lobe, each with two small setae at apex. Ventral operculum poorly sclerotized, limit inconspicuous, only divided in apical part, each lobe bluntly rounded apically ( Fig. 19 I). In lateral view, median lobe distinctly bent ventrad and strongly thinned to apex from about apical 1/3, several ventrally-oriented long setae inserted below apex ( Fig. 19 J). Internal stylus moderately wide, multiannulate at basal part; two lateral sacs at basal region of aedeagus.

Female. Similar to male in general appearance except simple protarsi ( Fig. 19 C). Spermatheca ‘C’ shape ( Fig. 19 K).

Distribution. China (Yunnan).

Etymology. The specific epithet is dedicated to Dr. Xiao-Dong Yu (IZ-CAS, Beijing, China), the first collector of this new species and a researcher on insect ecology in our research team.

Remarks. P. yui sp. nov. with aedeagus suboval, gradually but distinctly narrowing towards apex in dorsal view, which is similar to species of P. anas Schilthuizen & Perreau, 2008 from Malaysia, P. assimilis Szymczakowski, 1972 from Vietnam, P. scaber Szymczakowski, 1964 from Myanmar and P. shibatai Hayashi, 1969 from Japan. However, in P. anas Schilthuizen & Perreau , its aedeagus quite more narrowed at apex and almost semicircular when viewed laterally; in P. assimilis Szymczakowski , its right apical expansion rounded at apex and internal stylus rather slender; in P. scaber Szymczakowski , its aedeagus slightly bent ventrad when viewed laterally, and for external morphology, its pronotum rather narrow, PW/PL merely 1.49; and in P. shibatai Hayashi , its aedeagus only a little bent ventrad when viewed laterally.

Figures

FIGURE 19. Ptomaphaginus yui sp. nov.: A, antenna ♂ (dorsal view); B, proleg ♂ (dorsal view); C, protarsus ♀ (dorsal view); D, protibia ♂ (ventral view); E, pronotum ♂ (dorsal view); F, elytral apex ♂ (dorsoapical view); G, abdominal segment IX ♂ (ventral view); H, aedeagus (dorsal view); I,. aedeagus (ventral view); J, aedeagus (lateral view); K, spermatheca. Scales: 0.1 mm.