Ptomaphaginus guangxiensis, 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 : 314-317

Ptomaphaginus guangxiensis sp. nov.

Figs. 9 A–M)

Type material. Holotype: CHINA, Guangxi: ♂, Napo, Nonghua, 960 m, 14.IV.1998, Hai-Sheng Zhou leg. ( IZ- CAS). Paratypes: 4♂♂, 2♀♀, same data as holotype (IZ-CAS); 1♂, same data as holotype except: 1130 m, 13–14.IV.1998, Min Wu leg. (IZ-CAS).

Description. Male. EBL: 3.21 mm. Length of different body parts: HL: AL: PL: ELL = 0.48: 0.81: 0.79: 1.81 mm; width: HW: EW: PW: ELW = 0.87: 0.12: 1.35: 1.39 mm. Proportion of antennomeres from base to tip in µm (length × width): 137 × 37, 114 × 48, 75 × 43, 48 × 42, 54 × 48, 33 × 54, 63 × 71, 29 × 72, 62 × 80, 63 × 83, 102 × 90.

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, elytral apex, and tarsi 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 very short and convex, transversely striolated, interspaces narrower than that on pronotum, HW/HL = 1.81; anterior margin round. Compound eyes well developed, EW/HW = 0.13. Antennae slender and relatively short ( Figs. 9 A), AL/HW = 0.93; 5th longer than 4th; 6th wider than long; 9th similar to 10th, wider than long; 11th pear-like.

Pronotum moderately transverse and convex ( Fig. 9 E), widest just before hind corners, PW/PL = 1.70. Sides regularly curved, narrowing from posterior to anterior; hind corners drawn out and blunt. Posterior margin with distinct postero-lateral emargination. Surface transversely striolated, SP: 49–51, interspaces narrower than that on elytra.

Elytra slender and regularly convex, widest at base, ELL/EW = 1.31. Sides feebly curved, gradually narrowing from base to apices; apices nearly rounded ( Fig. 9 F). Surface transversely striolated, SE: 80–83. Metathoracic wings fully developed.

Prolegs robust, with basal three protarsomeres strongly expanded ( Fig. 9 B): TW/BTW = 1.31. Spinal arrangement on ventral side of protibia as shown in Fig. 9 D. Profemora wider than protibiae, and hairs on ventral side a little longer than that of protibiae, but much longer on inner margin. Mesotibiae moderately arcuate.

Ventrite VII slightly bisinuated at posterior margin ( Fig. 9 G). Ventrite VIII with a subtriangular fossa moderately deep, several subacute spines bordered lateral sides of fossa, and distinctly emarginate posteriorly ( Fig. 9 H). Segment IX: spiculum gastrale wide, flared at posterior end ( Fig. 9 I).

P. pingtungensis P. guangxiensis P. ruzickai P. shennongensis ventrite VIII several subacute spines several subacute spines several blunt spines no spines bordered

bordered lateral sides of bordered lateral sides of bordered lateral sides of lateral sides of

subtriangular fossa (Fig. subtriangular fossa (Fig. subtriangular fossa (Fig. subtriangular fossa ( Fig. 8 F) 9H) 15H). 16H).

Aedeagus oblong in dorsal view ( Fig. 9 J): median lobe widest around middle and gently narrowed to both ends; opening of genital orifice trended to cut right margin of median lobe; right apical expansion regularly curved at apex; parameres moderately widened towards apex, firmly attached to median lobe. Ventral operculum broad, only divided in apical part, each lobe feebly emarginate at apical margin ( Fig. 9 K). In lateral view, median lobe gently bent ventrad, apex a little thinned, and several ventrally-oriented setae inserted below apex as well as two at middle ( Fig. 9 L). Internal stylus wide, multiannulate at about basal 1/3.

Female. Similar to male in general appearance, except for the following characters: protarsi normal ( Fig. 9 C), profemora without long hairs on ventral side and ventrite VIII regularly rounded posteriorly. Spermatheca swollen at end ( Fig. 9 M).

Distribution. China (Guangxi).

Etymology. The specific epithet is from the Chinese name (Pinyin) of the type locality “Guangxi”, an autonomous region in southern China.

Remarks. Table 1 shows some important difference of four closed-allied species: P. pingtungensis Perreau , P. guangxiensis sp. nov., P. ruzickai sp. nov., and P. shennongensis sp. nov.

Figures

FIGURE 8. Ptomaphaginus pingtungensis Perreau, 1996: A, antenna ♂ (dorsal view); B, proleg ♂ (ventral view); C, pronotum ♂ (dorsal view); D, elytral apex ♂ (dorsoapical view); E, ventrite VII ♂ (ventral view); F, ventrite VIII ♂ (ventral view); G, abdominal segment IX ♂ (ventral view); H, aedeagus (dorsal view); I, aedeagus (ventral view); J, aedeagus (lateral view); K, spermatheca (after Perreau, 1996). Scales: 0.1 mm.

FIGURE 9. Ptomaphaginus guangxiensis 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.

Tables

TABLE 1. Selected important morphological differences in related Ptomaphaginus species.

EBL (mm)	2.56	3.32	2.54 2.53
HW/HL	1.65	1.81	1.66 1.73
ELL/EW	1.13	1.31	1.23 1.28
TW/BTW	1.52	1.31	1.27 1.3
SP	49–51	44–46	37–39 37–40
SE	80–83	67–70	69–72 67–69
ventrite VII	simple (Fig. 8E)	slightly bisinuated at posterior margin (Fig. 9G)	with two moderately slightly bisinuated at strong teeth at posterior posterior margin (Fig. margin and several blunt 16G) spines located on teeth (Fig. 15G)