Ptomaphaginus perreaui, 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 : 323-324

Ptomaphaginus perreaui sp. nov.

( Figs. 13 A–I)

Type material. Holotype: CHINA, Yunnan: ♂, Jinghong forest park, 800 m, rainforest valley, pitfall trap, 26.II.2004, Jie Wu leg. (IZ-CAS).

Description. Male. EBL: 2.05 mm. Length of different body parts: HL: AL: PL: ELL = 0.35: 0.52: 0.50: 1.13 mm; width: HW: EW: PW: ELW = 0.59: 0.08: 0.83: 0.91 mm. Proportion of antennomeres from base to tip in µm (length × width): 82 × 28, 78 × 35, 41 × 32, 28 × 35, 28 × 39, 22 × 46, 40 × 58, 13 × 56, 41 × 64, 40 × 67, 78 × 65.

Habitus elongated oval, relatively convex and lustreless. Moderately pigmented: mostly chestnut brown; occiput blakish brown; mouthparts, basal six antennomeres and apical half of ultimate antennomere, base of pronotum, about apical 1/3 of elytra, 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 convex, finely punctured, without visible transverse striolations, HW/HL = 1.67; anterior margin round. Compound eyes well developed, EW/HW = 0.13. Antennae short and condensed ( Fig. 13 A), AL/HW = 0.89; 4th antennomere as long as 5th; 6th transverse; 9th and 10th wider than long; 11th pear-like.

Pronotum transverse and convex ( Fig. 13 D), widest at base, PW/PL = 1.65. Sides almost rectilinearly narrowing from posterior to anterior; hind corners drawn out and bluntly rounded. Posterior margin with distinct postero-lateral emargination. Surface transversely striolated, SP: 31–34, interspaces as wide as that on elytra.

Elytra of medium length and convex, widest directly after base, ELL/EW = 1.23. Sides feebly curved, gradually narrowing from base to apices; apices nearly rounded ( Fig. 13 E). Surface transversely striolated, SE: 61–64. Metathoracic wings fully developed.

Prolegs robust, with basal three protarsomeres moderately expanded ( Fig. 13 B): TW/BTW = 1.37. Spinal arrangement on ventral side of protibia as shown in Fig. 13 C. Profemora wider than protibiae, and hairs on ventral side similar to that of protibiae. Mesotibiae moderately arcuate.

Ventrite VII simple. Ventrite VIII regularly rounded posteriorly. Segment IX: spiculum gastrale elongate and moderately wide, sides nearly parallel, posterior end subrounded ( Fig. 13 F).

Aedeagus oval in dorsal view ( Fig. 13 G): median lobe gently narrowed towards apex; opening of genital orifice trended to cut right margin of median lobe; right apical expansion golfclub-like at apical part; parameres narrow, firmly attached to median lobe. Ventral operculum distinctly and widely emarginate, each short lobe obliquely truncated apically ( Fig. 13 H). In lateral view, median lobe slightly bent ventrad at about apical 1/3, apex a little thinned, and three ventrally-oriented setae inserted below apex as well as two just before middle ( Fig. 13 I). Internal stylus wide, multiannulate at about basal 1/3.

Female. Unknown.

Distribution. China (Yunnan).

Etymology. The specific epithet is dedicated to Dr. Michel Perreau (Université Paris 7, Paris, France), a famous taxonomist on Leiodidae , for his excellent work on Chinese fauna and generous help to our study.

Remarks. Obviously, this new species has the smallest body size of all species included here, EBL only approximately equal to 2.00 mm and its aedeagus is similar to P. bengalicola Perreau, 1991 from India, P. bucculentus Szymczakowski, 1974 from Nepal, P. cherrapunjeensis Perreau, 1991 from India, P. minimus Perreau, 1988 from Nepal and P. palpaloides Perreau, 1988 from Nepal, but it can be distinguished from those mentioned by the combination of its minute size, spiculum gastrale elongate and lateral sides parallel, ventral operculum distinctly and widely emarginate, and aedeagal shape when viewed laterally.

Figures

FIGURE 13. Ptomaphaginus perreaui sp. nov. ♂: A, antenna (dorsal view); B, proleg (dorsal view); C, protibia (ventral view); D, pronotum (dorsal view); E, elytral apex (dorsoapical view); F, abdominal segment IX (ventral view); G, aedeagus (dorsal view); H, aedeagus (ventral view); I, aedeagus (lateral view). Scales: 0.1 mm.