Ptomaphaginus quadricalcarus, 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 : 324-326

Ptomaphaginus quadricalcarus sp. nov.

( Figs. 2 A–F; 14A–I)

Type material. Holotype: CHINA, Yunnan: ♂, Xishuangbanna, Yao Region, 21°43.850′N 101°30.953′E, 1150 m, window trap, 4.X.2010, Liang Lü, Xi Zhang & Yu-Lingzi Zhou legg. (IZ-CAS).

Description. Male. EBL: 2.68 mm. Length of different body parts: HL: AL: PL: ELL = 0.47: 0.88: 0.69: 1.42 mm; width: HW: EW: PW: ELW = 0.79: 0.10: 1.10: 1.21 mm. Proportion of antennomeres from base to tip in µm (length × width): 146 × 42, 118 × 46, 68 × 40, 51 × 44, 58 × 47, 51 × 56, 67 × 71, 34 × 72, 82 × 84, 76 × 88, 129 × 89.

Habitus elongated oval, relatively convex and rather lustreless. Moderately pigmented: mostly chestnut brown; only mouthparts, antennae, protarsi, elytral apex, and distal half of meso- and metatarsi 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 ( Fig. 2 A).

Head moderately short and gently convex, finely punctured, without visible transverse striolations, HW/HL = 1.66; anterior margin round. Compound eyes well developed, EW/HW = 0.13. Antennae slender but not very long ( Fig. 14 A), AL/HW = 1.12; 5th longer than 4th; 6th and 9th almost quadrate respectively; 10th slightly wider than long; 11th pear-like.

Pronotum not rather transverse and convex ( Fig. 14 C), widest at base, PW/PL = 1.59. Sides almost rectilinearly narrowing from posterior to anterior; hind corners drawn out and bluntly rouned. Posterior margin with distinct postero-lateral emargination. Surface transversely striolated, SP: 41–44, interspaces narrower than that on elytra.

Elytra relatively short and convex, widest at about basal 1/3, ELL/EW = 1.18. Sides curved, gradually narrowing from base to apices; apices obliquely truncated ( Fig. 2 A). Surface transversely striolated, SE: 64–66. Metathoracic wings fully developed.

Prolegs robust, with basal three protarsomeres very strongly expanded ( Fig. 14 B): TW/BTW = 1.15. Spinal arrangement on ventral side of protibia as shown in Fig. 14 B. Profemora wider than protibiae, carried long and strong hairs on ventral side. Mesotibiae moderately arcuate. Metatibia not only born two spurs at inner side of distal end, but also two large spur-like spines at ventral side ( Fig. 14 D).

Ventrite VII simple, feebly bisinuated at posterior margin. Ventrite VIII with a large fossa subround and shallow, moderaterly emarginate posteriorly ( Fig. 14 E). Segment IX: spiculum gastrale subfusiform, narrowly rounded at posterior end ( Fig. 14 F).

Aedeagus rather elongated oval in dorsal view ( Fig. 14 G): median lobe generally narrowed towards apex, apical margin distinctly emarginate at middle; right apical expansion weakly sclerotized, rounded at apex, stuck out of apical margin of median lobe; parameres narrow, firmly attached to median lobe. Ventral operculum distinctly divided in apical part, each lobe narrowly subrounded apically ( Fig. 14 H). In lateral view, median lobe obviously bent ventrad, apical part strongly thinned and flattened, and several ventrally-oriented setae inserted below apex as well as two just before middle ( Fig. 14 J). Internal stylus quite slender.

Female. Unknown.

Distribution. China (Yunnan).

Etymology. The specific epithet is from the Latin words quadr (four) and calcar (spine) to refer to two inner spurs and two additional spur-like ventral spines on distal end of metatibia in this new species.

Remarks. The rather elongated oval aedeagus of this new species is similar to two Japanese species: P. shibatai Hayashi, 1969 and P. okinawaensis Hoshina & Sugaya, 2003 , but it is easily to be distinguished from the latter two (even all other congeners) by the following characters: two inner spurs and additional two spur-like ventral spines on distal end of metatibia, median lobe distinctly emarginate at middle of apical margin and a special shape when aedeagus was viewed laterally.

Figures

FIGURE 2. Ptomaphaginus quadricalcarus sp. nov. ♂: A, extended habitus (dorsal view); B, labrum (dorsal view); C, left mandible (dorsal view); D, right mandible (dorsal view); E, right maxilla (dorsal view); F, hypopharynx and labial palps (ventral view). Scales: A = 1 mm; B – F = 0.1 mm.

FIGURE 14. Ptomaphaginus quadricalcarus sp. nov. ♂: A, antenna (dorsal view); B, proleg (ventral view); C, pronotum (dorsal view); D, metatibial apex (ventral view); E, ventrite VIII (ventral view); F, abdominal segment IX (ventral view); G, aedeagus (dorsal view); H, aedeagus (ventral view); J, aedeagus (lateral view). Scales: 0.1 mm.