Ptomaphaginus wenboi, 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 : 330-332

Ptomaphaginus wenboi sp. nov.

( Figs. 17 A–M)

Type material. Holotype: CHINA, Taiwan: ♂, Fushan, mouse carcass bait, IX.2007, Wen-Bo Huang leg. ( NTUC). Paratypes: 3♂♂, 1♀, same data as holotype except: VI.2007 (2♂♂ in NTUC, and 1♂, 1♀ in IZ-CAS); 2♀♀, same data as holotype except: VIII.2007 ( NTUC).

Description. Male. EBL: 2.89 mm. Length of different body parts: HL: AL: PL: ELL = 0.50: 0.89: 0.70: 1.57 mm; width: HW: EW: PW: ELW = 0.80: 0.11: 1.26: 1.30 mm. Proportion of antennomeres from base to tip in µm (length × width): 154 × 42, 115 × 47, 72 × 47, 50 × 49, 57 × 54, 40 × 62, 65 × 78, 26 × 78, 69 × 86, 66 × 86, 119 × 90.

Habitus elongated oval, relatively convex and lustreless. Moderately pigmented: mostly chestnut brown; only mouthparts, apical half of ultimate antennomere, and tarsi somewhat 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 relatively longer and gently convex, finely punctured, without visible transverse striolations, HW/HL = 1.59; anterior margin round. Compound eyes rather developed, EW/HW = 0.14. Antennae slender but not very long ( Fig. 17 A), AL/HW = 1.11; 5th longer than 4th; 6th wider than long; 7th longer than wide; 9th and 10th wider than long; 11th pear-like.

Pronotum rather transverse and convex ( Fig. 17 E), widest just before hind corners, PW/PL = 1.82. Sides slightly curved, narrowing from posterior to anterior; hind corners drawn out and relatively acute. Posterior margin with distinct postero-lateral emargination. Surface transversely striolated, SP: 46–48, interspaces narrower than that on elytra.

Elytra of medium length and convex, widest after base, ELL/EW = 1.20. Sides feebly curved, gradually narrowing from base to apices; apices somewhat obliquely truncated ( Fig. 17 F). Surface transversely striolated, SE: 78–80. Metathoracic wings fully developed.

Prolegs robust, with basal three protarsomeres not much expanded ( Fig. 17 B): TW/BTW = 1.55. Spinal arrangement on ventral side of protibia as shown in Fig. 17 D. Profemora wider than protibiae, carried long hairs on ventral side. Mesotibiae moderately arcuate.

Ventrite VII simple, widely and slightly emarginate on posterior margin ( Fig. 17 G). Ventrite VIII with a large fossa subround and moderately shallow, feebly emarginate posteriorly ( Fig. 17 E). Segment IX: spiculum gastrale widely subelliptic, rounded at posterior end ( Fig. 17 I).

Aedeagus subquadrate in dorsal view ( Fig. 17 J): sides of median lobe curved; right apical expansion strongly and narrowly stuck out of apical margin of median lobe and dorsally rolled; parameres firmly attached to median lobe, distinctly widened at apex in dorsal view, each with two setae at apex. Ventral operculum poorly sclerotized, limit inconspicuous, divided in apical half, each lobe substraight apically ( Fig. 17 K). In lateral view, median lobe distinclty 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. 17 L). Internal stylus slender, multiannulate at about basal 1/2.

Female. Similar to male in general appearance, except for the following characters: protarsi normal ( Fig. 17 C), profemora without long hairs on ventral surface and ventrite VIII regularly rounded posteriorly. Spermatheca anchor-like ( Fig. 17 M).

Distribution. China ( Taiwan).

Etymology. The specific epithet is dedicated to Dr. Wen-bo Huang (National Taiwan University, Taipei, China), the collector of this new species and a researcher of insect ecology in National Taiwan University.

Remarks. This new species is sympatric with P. sauteri (Portevin) and both of them with a subround fossa on ventrite VIII, so they are easily confused, but can be distinguished by their conspicuously different aedeagi. Aedeagus of this new species is similar to P. coronatus Szymczakowski, 1974 from Philippines, P. fornicatus Szymczakowski, 1972 from Vietnam, P. honestus Szymczakowski, 1964 from Myanmar, P. kurbatovi Schilthuizen & Perreau, 2008 from Indonesia, P. latipes ( Pic, 1929) from Philippines, P. obtusus Szymczakowski, 1959 from Indonesia, P. sabahensis Schilthuizen & Perreau, 2008 from Malaysia and P. takaosanus Nakane, 1982 from Japan; these all with subquadrate aedeagus and non-incurved sides of median lobe when viewed dorsally. But, this new species differs obviously from them by aedeagus with right apical expansion narrowly stuck out and dorsally rolled, together with aedeagal shape when viewed laterally.

Figures

FIGURE 17. Ptomaphaginus wenboi 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, ventrite VII ♂ (ventral view); H, ventrite VIII ♂ (ventral view); I, abdominal segment IX ♂ (ventral view); J, aedeagus (dorsal view); K, aedeagus (ventral view); L, aedeagus (lateral view); M, spermatheca. Scales: 0.1 mm.