Ptomaphagus (s. str.) chenggongi, Wang, Cheng-Bin, Nishikawa, Masaaki, Perreau, Michel, Ruzicka, Jan & Hayashi, Yasuhiko, 2016

Wang, Cheng-Bin, Nishikawa, Masaaki, Perreau, Michel, Ruzicka, Jan & Hayashi, Yasuhiko, 2016, Revision of the genus Ptomaphagus Hellwig (Coleoptera, Leiodidae, Cholevinae) from Taiwan Island, ZooKeys 609, pp. 43-62 : 49-53

Taxon classification Animalia Coleoptera Leiodidae

Ptomaphagus (s. str.) chenggongi sp. n. Figs 3; 8; 9A, C, E, G, H; 10

Type locality.

Central Taiwan, Nantou Hsien, Tsuifeng [翠峰, ca. 24°06'N, 121°11'E], 2,300 m.

Type material.

Holotype: ♂, [Taiwan] Tsuifeng [翠峰, ca. 24°06'N, 121°11'E], 2,300 m / FIT: in shady Forest / Nantou Hsien // Central Taiwan / 7~14-VIII-2003 / Wataru Suzuki leg. (NSMT). Paratypes: 22♂♂24♀♀, same data as holotype (22♂♂22♀♀ in CMNE, 2♀♀ in NSMT); 2♂♂, same data as holotype except: FIT: Forest edge (CMNE); 10♂♂10♀♀, same data as holotype except: 2,200 m / FIT: shady natural forest (CMNE); 2♂♂1♀, same data as holotype except: 2,200 m (CMNE); 1♀, TAIWAN, Nantou / Hsien, Meifeng [梅峰, ca. 24°05'N, 121°10'E] / 2130 m 10-17.VII.[19]93 / yellow pan traps / A. Smetana [leg.] (T147) (CJRZ).

Description.

Male. EBL: 4.1-4.2 mm (4.2 mm in holotype). Length of different body parts: HL: AL: PL: ELL = 0.67: 1.26: 1.00: 2.32 mm; width: HW: EW: PW: ELW = 1.04: 0.09: 1.49: 1.64 mm. Proportion of antennomeres from base to tip in μm (length × width): 179 × 77, 123 × 68, 105 × 74, 75 × 82, 75 × 99, 53 × 113, 104 × 135, 53 × 132, 102 × 138, 117 × 137, 217 × 116.

Habitus (Fig. 3A) elongated oval, regularly convex and sublustrous. Well pigmented: mostly brown; mouthparts, basal four or five antennomeres and apical half of ultimate antennomere, protarsi, and apex of meso- and metatarsi yellowish. Dorsum continuously clothed with fine, recumbent, yellowish pubescence. Insertions of pubescence on dorsal surfaces of pronotum, elytra and femora aligned along transverse striolations; interspace between two striolations glabrous.

Head transverse, HW/HL = 1.5. Clypeofrontal suture absent. Clypeus with anterior margin slightly rounded. Compound eyes well developed, EW/HW = 0.1. Antennae (Fig. 8A) slender, AL/HW = 1.3; antennomere III a little shorter than II; VI with length/width = 0.5; XI elongated pear-shaped.

Pronotum (Fig. 8B) transverse, widest just before hind angles, PW/PL = 1.5. Sides gently arched, narrowing from posterior to anterior, and slightly constricted before hind angles, which projected backwards and subacute. Posterior margin widely protruding in the middle part, distinctly emarginate near hind angles.

Elytra oval, widest at about basal 2/7, ELL/EW = 1.4. Sides weakly arched, gradually narrowing from widest part to apices, which narrowly rounded (Fig. 8G). Sutural striae present. Metathoracic wings fully developed.

Prolegs robust, with basal three protarsomeres (Fig. 8C) strongly expanded: TW/BTW = 1.0. Protibiae (Fig. 8E) expanded towards apex. Profemora rather broad. Mesotibiae arcuate, mesotarsi simply linear. Metatibiae slender and straight.

Abdominal ventrite VIII (Fig. 8I) round at posterior edge, though an inconspicuous median notch at the median. Genital segment (Fig. 8J) with spiculum gastrale protruding about 3/8 of its length beyond anterior edge of epipleurite IX.

Aedeagus (Fig. 9A) long and slender, with median lobe gradually narrowing towards lanceolate apical part and terminated by round knob in dorsal view; opening of genital orifice situated on dorsal surface, deeply cut inwards on preapical left margin of median lobe. Ventral surface of the apex of the median lobe (Fig. 9G) inserted with a row of 6 ventrally oriented setae (the bottom one is very short) on the left side and a row of 4 ventrally oriented setae on the right side. Parameres narrow, reaching about apical 1/5 of median lobe, each with 1 apical and 2 preapical setae, the apical one slightly shorter (Fig. 9E). In lateral view (Fig. 9C), median lobe regularly bent ventrad, gradually tapering apically. Endophallus with stylus quite slender, a cheliform complex just below the base of stylus, and a circular complex in basal region.

Female. Similar to male in general appearance (Fig. 3B), including elytral apices (Fig. 8H), but distinguished by the following characteristics: protarsi (Fig. 8D) simply linear; protibiae (Fig. 8F) only slightly narrower; abdominal ventrite VIII (Fig. 9A) almost regularly rounded at posterior edge; genital segment as shown in Fig. 9B: spermatheca (Fig. 9B) curved in distal part, coiled and extended leftwards in proximal part.

Diagnosis.

Ptomaphagus (s. str.) chenggongi sp. n. has very similar aedeagus to Ptomaphagus (s. str.) tingtingae sp. n., but can be distinguished from the latter by the following characters: in Ptomaphagus (s. str.) chenggongi sp. n., antennomere XI with length/width = 1.9, hind angles of pronotum subacute, spiculum gastrale of genital segment with ordinary width, right apicoventral piece of median lobe broad (Fig. 9H), apical seta of parameres slightly shorter than preapical setae, and spermatheca coiled and extended leftwards in proximal part; while in Ptomaphagus (s. str.) tingtingae sp. n., antennomere XI with length/width = 1.3, hind angles of pronotum acute, spiculum gastrale of genital segment very narrow, right apicoventral piece of median lobe rather small (Fig. 9I), apical seta of parameres very shorter than preapical setae, and spermatheca coiled but not extended leftwards in proximal part.

Etymology.

The specific epithet is dedicated to Cheng-Gong Zheng (1624-1662), a military leader at the end of the Chinese Ming Dynasty, for his feats in 1662 when he defeated the forces of the Dutch East India Company and claimed Taiwan, bringing it under Chinese Han rule.

Distribution.

China (Taiwan) (Fig. 12).