Ptomaphagus (s. str.) yasutoshii Nishikawa, 1993

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 : 46-49

Taxon classification Animalia Coleoptera Leiodidae

Ptomaphagus (s. str.) yasutoshii Nishikawa, 1993 Figs 2; 5, 6, 7

Ptomaphagus (s. str.) yasutoshii Nishikawa 1993: 123 ( Ptomaphagus (s. str.); type locality: Taiwan, Nantou Hsien, near Tsuifeng, 2200 m; NSMT); Perreau 2000: 367 ( Ptomaphagus (s. str.); in catalogue); Perreau 2004: 178 ( Ptomaphagus (Ptomaphagus) ; in catalogue); Perreau 2015: 250 ( Ptomaphagus (Ptomaphagus) ; in catalogue).

Ptomaphagus (s. str.) smetanai Perreau 1996: 285 ( Ptomaphagus (s. str.); type locality: Taiwan, Hualien Hsien, Taroko, N. P. Duodyatunshan, 2660 m; MHNG); Perreau 2000: 364 ( Ptomaphagus (s. str.); in catalogue); Perreau 2004: 178 ( Ptomaphagus (Ptomaphagus) ; in catalogue); Perreau 2015: 249 ( Ptomaphagus (Ptomaphagus) ; in catalogue). Syn. n.

Material examined.

Type material. Holotype of Ptomaphagus yasutoshii : ♂, (Near TSIFENG [翠峰, ca. 24°06'N, 121°11'E]) / Nantou - Hsien, / TAIWAN (2200 m) / Aug. 25th, 1974 / Coll. Y. Shibata // HOLOTYPE / Ptomaphagus (s. str.) / yasutoshii / M. Nishikawa, 1993 (NSMT). Allotype of Ptomaphagus yasutoshii : ♀, (Near TSIFENG [翠峰, ca. 24°06'N, 121°11'E]) / Nantou - Hsien, / TAIWAN (2200 m) / July 27th, 1974 / Coll. Y. Shibata // ALLOTYPE / Ptomaphagus (Ptomaphagus) / yasutoshii M. Nishikawa , / 1993 / Design. M. Nishikawa, 1993 / # MNIC 124929Ch2S ♀ // ♀ (CMNE). Holotype of Ptomaphagus smetanai : ♂, TAIWAN Hualien / Hsien, Taroko, N. P / [Mt.] Duodyatunshan [多加屯山, ca. 24°18'N, 121°30'E] / 2650 m, 8.-13.V.[19]90 / A. Smetana [leg.] (T57) // HOLOTYPE / PTOMAPHAGUS SMETANAI / M. Perreau det. 1994 // MHNG / ENTO / 00003352 (MHNG).

Additional material.

1♀, Mt. YUSHAN [玉山, ca. 23°28'N, 120°57'E] / TAIWAN / 20.V.1981 / N. ITO [leg.] // Ptomaphagus / (s. str.) yasutoshii / MS / Exs. M. NISHIKAWA, 1992 (CYHK).

Redescription.

Male. EBL: 4.3 mm in holotype of Ptomaphagus yasutoshii and 4.9 mm in holotype of Ptomaphagus smetanai ). Length of different body parts: HL: AL: PL: ELL = 0.78: 1.51: 1.08: 2.25 mm; width: HW: EW: PW: ELW = 1.22: 0.10: 1.79: 1.90 mm. Proportion of antennomeres from base to tip in μm (length × width): 202 × 85, 139 × 81, 170 × 82, 95 × 83, 91 × 98, 87 × 114, 125 × 138, 57 × 122, 117 × 138, 123 × 134, 205 × 119.

Habitus (Fig. 2A, C) elongated oval, regularly convex and sublustrous. Well pigmented: mostly dark brown; mouthparts, antennae (apical half of ultimate antennomere yellowish) and tarsi reddish brown. Dorsum continuously clothed with fine, recumbent, yellowish pubescence. Insertions of pubescence on dorsal surfaces of head, pronotum, elytra and femora aligned along transverse striolations; interspace between two striolations glabrous.

Head transverse, HW/HL = 1.6. Clypeofrontal suture absent. Clypeus with anterior margin almost straight. Compound eyes small, EW/HW = 0.1. Antennae (Fig. 5A) slender, AL/HW = 1.2; antennomere III much longer than II; VI with length/width = 0.8; XI pear-shaped.

Pronotum (Fig. 5B) much transverse, widest just before hind angles, PW/PL = 1.7. Sides regularly rounded, gradually narrowing from posterior to anterior, and slightly constricted before hind angles, which projected backwards and acute. Posterior margin widely protruding in the middle part, distinctly emarginate near hind angles.

Elytra oval and quite wide, widest at about basal 1/5, ELL/EW = 1.2. Sides weakly arched, gradually narrowing from widest part to apices, which obliquely truncated (Fig. 5G). Sutural striae present. Metathoracic wings absent.

Prolegs robust, with basal three protarsomeres (Fig. 5C) strongly expanded: TW/BTW = 1.1. Protibiae (Fig. 5E) distinctly expanded towards apex. Profemora rather broad. Mesotibiae arcuate, mesotarsi simply linear. Metatibiae slender and straight.

Abdominal ventrite VIII (Fig. 5I) widely and deeply emarginate at posterior edge. Genital segment (Fig. 5J) with spiculum gastrale protruding about 1/2 of its length beyond anterior edge of epipleurite IX.

Aedeagus (Fig. 6A, B) large, slender and strongly asymmetrical, with median lobe gradually narrowing towards lanceolate apical part which turning to right 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 apical part of the median lobe (Figs 6F, G) inserted with a row of 7 ventrally-oriented setae on both sides. Parameres narrow, reaching about apical 1/5 of median lobe, each with 1 apical and 2 preapical setae, the apical one much shorter (Fig. 6E). In lateral view (Fig. 6C, D), median lobe distinctly bent ventrad and strongly tapering towards narrowly acuminate apex. 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. 2B, D), including elytral apices (Fig. 5H), but distinguished by the following characteristics: protarsi (Fig. 5D) simply linear; protibiae (Fig. 5F) much narrower; abdominal ventrite VIII (Fig. 7D) strongly and widely protruded at median of posterior edge; genital segment as shown in Fig. 7A; spermatheca (Fig. 7 A–C) spiral-shaped, discoidal in distal part.

Remarks.

This species is exceptional in the genus Ptomaphagus in the following characters: metathoracic wings absent; aedeagus strongly asymmetrical, median lobe turning rightwards in apical part; spermatheca spiral-shaped, discoidal in distal part.

In addition, the holotypes of Ptomaphagus yasutoshii and Ptomaphagus smetanai have almost identical aedeagal shape (Fig. 6 A–D) and no distinct differences in the external morphology, except some variations exist in the shape of aedeagal apex: the right apicoventral piece of median lobe of Ptomaphagus yasutoshii (Fig. 6H) is somewhat wider than that of Ptomaphagus smetanai (Fig. 6I). However, such differences, which fall within intraspecific variability, does not prevent us from synonymizing the two species.

Distribution.

China (Taiwan) (Fig. 12).