Ptomaphaginus gutianshanicus, 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 : 317-319

Ptomaphaginus gutianshanicus sp. nov.

( Figs. 1 A–K; 10A–J)

Type material. Holotype: CHINA, Zhejiang: ♂, Gutianshan [=Mt. Gutian], 296–402 m, broadleaved mixed forest, pitfall trap, 30.IV–3.V.2010, Chong-Ling Liu leg. (IZ-CAS). Paratypes: 20♂♂, 48♀♀, same data as holotype (IZ-CAS); 2♀♀, same data as holotype except: 446–715 m, 11–14.VI.2009 (IZ-CAS); 1♀, same data as holotype except: 296 m, 20–23.VI.2009 (IZ-CAS); 2♀♀, same data as holotype except: 500–750 m, 22–25.VI.2009 (IZ-CAS); 1♀, same data as holotype except: 429 m, 2–5.VIII.2009 (IZ-CAS); 1♀, same data as holotype except: 446–715 m, 9–12.IX.2009 (IZ-CAS); 1♀, same data as holotype except: 560 m, 16–19.IX.2009 (IZ-CAS); 1♂, 1♀, same data as holotype except: 446–715 m, 23–27.IX.2009 (IZ-CAS); 1♀, same data as previous except: 19–22.X.2009 (IZ-CAS); 79♂♂, 114♀♀, same data as holotype except: 446–715 m, 1–4.V.2010 (IZ-CAS); 17♂♂, 37♀♀, same data as holotype except: 390–605 m, 2–5.V.2010 (IZ-CAS); 2♂♂, 2♀♀, same data as holotype except: 543–823 m, 10–13.V. 2010 (IZ-CAS); 6♂♂, 16♀♀, same data as holotype except: 308–605 m, 23–27.V.2010 (IZ-CAS); 7♂♂, 9♀♀, same data as holotype except: 446–823 m, 25–29.V.2010 (IZ-CAS).

Description. Male. EBL: 2.37 mm. Length of different body parts: HL: AL: PL: ELL = 0.40: 0.73: 0.65: 1.23 mm; width: HW: EW: PW: ELW = 0.67: 0.08: 1.12: 1.00 mm. Proportion of antennomeres from base to tip in µm (length × width): 127 × 39, 100 × 38, 53 × 32, 43 × 39, 46 × 44, 34 × 59, 51 × 69, 22 × 67, 62 × 75, 59 × 77, 115 × 76.

Habitus elongated oval, relatively convex and rather lustreless. Moderately pigmented: mostly chestnut brown, occiput somewhat darker; only mouthparts, antennae, elytral apex 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 ( Fig. 1 A).

Head moderately short and gently convex, surface finely punctured, without visible transverse striolations, HW/HL = 1.67; anterior margin round. Compound eyes well developed, EW/HW = 0.12. Antennae slender but not very long ( Fig. 10 A), AL/HW = 1.10; 5th slightly longer than 4th; 6th wider than long; 9th and 10th slightly wider than long; 11th pear-like.

Pronotum moderately transverse and convex ( Fig. 10 D), widest at base, PW/PL = 1.72. 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: 41–45, interspaces narrower than that on elytra.

Elytra of medium length and weakly convex, widest directly after base, ELL/EW = 1.23. Sides feebly curved, gradually narrowing from base to apices; apices obliquely truncated ( Fig. 1 A). Surface transversely striolated, SE: 65–68. Metathoracic wings fully developed.

Prolegs robust, with basal three protarsomeres strongly expanded ( Fig. 10 B): TW/BTW = 1.30. Spinal arrangement on ventral side of protibia as shown in Fig. 10 B. Profemora wider than protibiae, and carried long hairs on ventral side. Mesotibiae feebly arcuate.

Ventrite VII simple. Ventrite VIII with a large fossa subround and shallow, slightly emarginate posteriorly ( Fig. 10 E). Segment IX: spiculum gastrale elongate, narrowly rounded at posterior end ( Fig. 10 F).

Aedeagus oblong in dorsal view ( Fig. 10 G): median lobe moderately narrowed from base to apex, apical margin truncated; right apical expansion weakly sclerotized, stuck out of apical margin, acuminating to a narrowly subround apex (shape somewhat variable); parameres relatively wide, firmly attached to median lobe. Ventral operculum poorly sclerotized, limit inconspicuous, divided in apical half, two lobes asymmetrical, subrounded apically on different levels ( Fig. 10 H). In lateral view, median lobe of about apical 1/3 obviously bent ventrad, apex thinned, and several ventrally-oriented fine setae inserted at subapex ( Fig. 10 I). Internal stylus quite slender.

Female. Similar to male in general appearance, except for the following characters: protarsi normal, profemora without long hairs on ventral side ( Fig. 10 C) and ventrite VIII regularly rounded posteriorly. Spermatheca ‘C’ shape ( Fig. 10 J).

Distribution. China (Zhejiang).

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

Remarks. This new species well resembles P. similis Schweiger from Fujian, China in general appearance and their type localities also with geographical proximity, but the new species has spiculum gastrale elongate, median lobe with apical margin truncated, and apex thinned in lateral view; while spiculum gastrale of the latter very widely subelliptic ( Fig. 4 ), median lobe with apical margin round, and apex significantly thickened in lateral view. And this new species is also similar to P. sauteri (Portevin) , but it can be distinguished from the latter by the shape of spiculum gastrale, apical expansion of aedeagus, wider parameres and the shape of ventral operculum. In addition, it is less common to collect a large number of Ptomaphaginus specimens at one location, and we learn from the collector that there were so many logs during his collection time at Gutianshan, this kind of ecological condition might have stimulated the rising of population density.

Figures

FIGURE 1. Ptomaphaginus gutianshanicus 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); G, cervical sclerite (dorsal view); H, metendosternite (dorsal view); I, prothorax (ventral view); J, metatergal apparatus (dorsal view); K, pterothorax (ventral view). Scales: A = 1 mm; B – K = 0.1 mm.

FIGURE 4. Ptomaphaginus similis Schweiger, 1956: abdominal segment IX ♂ (ventral view; holotype; based on Michel Perreau’s photo).

FIGURE 10. Ptomaphaginus gutianshanicus sp. nov.: A, antenna ♂ (dorsal view); B, proleg ♂ (ventral view); C, proleg ♀ (ventral view); D, pronotum ♂ (dorsal view); E, ventrite VIII ♂ (ventral view); F, abdominal segment IX ♂ (ventral view); G, aedeagus (dorsal view); H, aedeagus (ventral view); I, aedeagus (lateral view); J, spermatheca. Scales: 0.1 mm.