Ptomaphaginus wuzhishanicus, 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 : 332-334

Ptomaphaginus wuzhishanicus sp. nov.

( Figs. 18 A–J)

Type material. Holotype: CHINA, Hainan: ♂, Wuzhishan [=Mt. Wuzhi], 790 m, undergrowth, window trap, 10.VII.2004, Jie Wu & Yong-Jie Chen legg. (IZ-CAS).

Description. Male. EBL: 2.62 mm. Length of different body parts: HL: AL: PL: ELL = 0.43: 0.68: 0.65: 1.40 mm; width: HW: EW: PW: ELW = 0.70: 0.10: 1.03: 1.19 mm. Proportion of antennomeres from base to tip in µm (length × width): 124 × 35, 103 × 44, 63 × 42, 34 × 43, 31 × 49, 21 × 54, 39 × 67, 16 × 65, 51 × 79, 53 × 77, 99 × 80.

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

Head moderately short and gently convex, finely punctured, without visible transverse striolations, HW/HL = 1.65; anterior margin round. Compound eyes rather developed, EW/HW = 0.15. Antennae slender ( Fig. 18 A), AL/ HW = 0.96; 5th shorter than 4th; 6th transverse; 9th and 10th wider than long; 11th pear-like.

Pronotum not rather transverse and convex ( Fig. 18 D), widest at base, PW/PL = 1.57. Sides almost rectilinearly narrowing from posterior to anterior; hind corners drawn out and blunt. Posterior margin with distinct postero-lateral emargination. Surface transversely striolated, SP: 41–43, interspaces narrower than that on elytra.

Elytra relatively short and convex, widest near base, ELL/EW = 1.18. Sides feebly curved, gradually narrowing from base to apices; apices obliquely truncated and with a tuft of strong hairs (ca. six) different to pubescence background ( Fig. 18 E). Surface transversely striolated, SE: 71–72. Metathoracic wings fully developed.

Prolegs robust, with basal three protarsomeres only slightly expanded ( Fig. 18 B): TW/BTW = 1.70. Spinal arrangement on ventral side of protibia as shown in Fig. 18 C. Profemora wider than protibiae, and hairs on ventral side of profemora similar to that of protibiae. Mesotibiae moderately arcuate.

Ventrite VII simple. Ventrite VIII also simple, gently emarginate posteriorly ( Fig. 18 F). Segment IX: uncinate tooth of genital plate much small and spiculum gastrale bottle-like, truncated at posterior end ( Fig. 18 G).

Aedeagus piriform in dorsal view ( Fig. 18 H): median lobe widest at about basal 1/3, sides of preapical part parallel; opening of genital orifice trended to cut right margin of median lobe; parameres relatively narrow, firmly attached to median lobe. Ventral operculum prominently and deeply bisected into long, narrow lobes, each rounded apically ( Fig. 18 I). Aedeagus like a tobacco pipe in lateral view, median lobe very arched, forming a right angle ( Fig. 18 J). Internal stylus very slender.

Female. Unknown.

Distribution. China (Hainan).

Etymology. The specific epithet is from the Chinese name (Pinyin) of the type locality “Wuzhishan” in Hainan province, China.

Remarks. This new species is sympatric with P. newtoni sp. nov., but it is easily to be distinguished from all other congener species from China by elytral apices with a tuft of strong hairs different from the pubescence background and its piriform aedeagus. Interestingly, this new species should belong to a group from Indian fauna with common character of piriform aedeagus, incluing P. apiculatus Szymczakowski, 1975 , P. pilipennis Perreau, 1991 , P. pilipennoides Perreau, 1991 , P. piraster Szymczakowski, 1975 , and P. riedeli Perreau, 1995 . However, it differs from P. apiculatus Szymczakowski , P. pilipennoides Perreau , P. piraster Szymczakowski and P. riedeli Perreau by its very arched median lobe, forming a right angle when viewed laterally; and in the new species, the aedeagus is relatively wider at basal half, and basal protarsomere obviously narrower than protibial apex, ELL/EW = 1.18, while in P. pilipennis Perreau the aedeagus is relatively narrower at basal half, and basal protersomere as wide as protibial apex, ELL/EW = 1.3. This new species is also similar to P. scaphaner Szymczakowski, 1972 from Vietnam, Malaysia and Indonesia, but they have differences in aedeagal apex shape: the latter with right apical expansion of aedeagus triangular and somewhat dorsally upturned; while the new species without apical expansion of aedeagus stuck out.

Figures

FIGURE 18. Ptomaphaginus wuzhishanicus sp. nov. ♂: A, antenna (dorsal view); B, proleg (dorsal view); C, protibia (ventral view); D, pronotum (dorsal view); E, elytral apex (dorsoapical view); F, ventrite VIII (ventral view); G, abdominal segment IX (ventral view); H, aedeagus (dorsal view); I, aedeagus (ventral view); J, aedeagus (lateral view). Scales: 0.1 mm.