Pseudophanias nakanoi Inoue, Nomura & Yin, 2020

Inoue, Shota, Nomura, Shuhei & Yin, Zi-Wei, 2020, Three new species of Pseudophanias Raffray from Japan and Taiwan Island, and synonymy of Chandleriella Hlavac with Pseudophanias (Coleoptera, Staphylinidae, Pselaphinae), ZooKeys 987, pp. 135-156 : 135

Pseudophanias nakanoi Inoue, Nomura & Yin sp. nov. Figs 5 , 6 , 7 , 8 [Japanese name: Nakano-tsumugata-arizukamushi]

Type material.

Holotype (NSMT): ♂, "屋久島 小楊枝林道, alt. 190 m. / [Yakushima Is.], Japan: / Kagoshima-ken, Kumage-gun, / Yakushima-chô, Koyôji-rindô / 30°17'36"N, 130°25'30"E, / 21 IX 2018, F. Nakano leg. // HOLOTYPE (red) /♂, Pseudophanias nakanoi sp. nov., / det. Inoue, Nomura & Yin, 2020" Paratype: Japan: 1 ♀, [ Ryûkyû; Tokara-rettô Isls.], Kagoshima-ken, Toshima-mura, Nakano-shima Is, Sato, 7-9 VII 2019, (leaf litter), N. Tsuji leg., with collecting permission of Toshima-mura Village (NSMT). Paratype pinned with the following label: "PARATYPE (yellow) / ♀, Pseudophanias nakanoi sp. nov., / det. Inoue, Nomura & Yin, 2020".

Diagnosis.

Pseudophanias nakanoi is similar to P. clavatus Raffray, 1904, but P. nakanoi can be distinguished from the latter by its modified antennal clubs, which are formed by three apical antennomeres, and the finely punctate head and pronotum.

Description.

Male (Figs 5A , 6A ). Body length 2.59 mm. Dorsal surface densely covered with long setae. Head (Fig. 7A ) as long as wide, HL 0.52 mm, HW 0.52 mm, nearly trapezoidal; frontal rostrum broad, short, strongly sulcate along midline, with large fovea in frontal sulcus; antennal tubercles distinct, with dense punctures which gradually disappear towards vertex; vertex polished, finely punctate, with pair of foveae; frontal, vertexal foveae glabrous; eyes large, weakly prominent; postocular margins two times longer than length of eyes. Antennae (Fig. 6B ) moderately elongate, 1.36 mm in length; antennal clubs formed by apical three antennomeres; antennomeres 1 thick, elongate, 1.5 times longer than 2; 2 slightly longer than wide; 3-7 nearly moniliform; 8 transverse; 9-11 enlarged, slightly excavated in outer margin; 9 nearly ovoid, each with smooth area on ventral surface; 10 transverse, half as long as 9, each with smooth area on ventral surface; 11 enlarged, widest at apical 1/3, strongly produced outward, roundly broadened to apices in inner margin, each with smooth area on ventral surface. Maxillary palpi (Fig. 7B ) symmetrical; palpomeres 1 minute; palpomeres 2 elongate, narrowed in basal halves; palpomeres 3 small, widest at apices; palpomeres 4 fusiform. Pronotum (Fig. 7C ) slightly wider than long, PL 0.53 mm, PW 0.55 mm; widest near anterior 1/3, then narrowed anteriorly, posteriorly, with coarse punctures along posterior margin, with a median and pair of lateral antebasal foveae, with distinct conical spine just anterior of above median fovea. Metaventrite (Figs 6D , 7D ) finely punctate, moderately convex, but just above metaventral apex roundly impressed; that impression half as long as metaventral length, occupying 1/4 metaventral width; anterior margin of that impression moderately rounded, distinct. Elytra (Fig. 7E ) nearly subtrapezoidal, widest near posterior 1/4 much wider than long, EL 0.72 mm, EW 0.99 mm, with dense setae, coarsely punctate, each elytron with two basal foveae; discal stria shallow, extending from median fovea to posterior 1/3. Legs. All legs moderately elongate and slender; femora each broadest near middle; tibiae each slightly broadened to apices, with dense yellow setae at apices; protibiae and mesotibiae nearly straight; metatibiae longest; tarsi each elongate, with tarsomeres 2 two-thirds as long as 3; mesotarsi (Fig. 7G ) modified, broadest; tarsomeres 3 each with projection of 3/4 length of entire tarsomeres; tarsal claws (Fig. 7H ) asymmetrical; anterior claws long; posterior claws thin, short. Abdomen (Fig. 7F ) wider than long, widest at tergite IV, AL 0.82 mm, AW 1.03 mm; tergite IV longest, twice as long as tergite V, with pair of longitudinal carinae extending to posterior half, with mediobasal setose depression distinct. Tergite and sternite VIII as in Fig. 8D, E . Aedeagus (Fig. 8A-C ) 0.46 mm in length, well-sclerotized, symmetrical in dorso-ventral view; parameres extremely elongate, reaching near apical fourth, each with three setae at apex; median lobe broad at base, split into ventral and dorsal lobes in lateral view; ventral lobe broadened from base toward apex in dorso-ventral view, curved ventrally and narrowed apically in lateral view; dorsal lobe terminated apical 1/3 of ventral lobe; endophallus indistinct.

Female (Fig. 5B ). BL 2.56 mm; HL 0.49 mm; HW 0.52 mm; PL 0.53 mm; PW 0.57 mm; EL 0.73 mm; EW 1.00 mm; AL 0.81 mm; AW 1.03 mm. Antennae (Fig. 6C ) unmodified, nearly moniliform, successively broadened apically; antennomeres 11 largest; eyes smaller than in male; mesotarsi without projection.

Etymology.

The new species is named after Mr Fumitaka Nakano, the original collector of the holotype.

Distribution.

Japan ( Ryûkyû: Tokara-rettô Isls.; Kyûshû: Yakushima Is.)

Biology.

The holotype was collected from a dead tree of the family Fagaceae , and the paratype female was collected from leaf litter.

Figures

Figure 5. Dorsal habitus of Pseudophanias nakanoi A male B female. Scale bar: 1.0 mm.

Figure 6. Morphological details of Pseudophanias nakanoi A habitus in lateral view B male antenna C female antenna D male metaventrite. Scale bars: 1.0 mm (A); 0.5 mm (D); 0.2 mm (B, C).

Figure 7. SEM images of Pseudophanias nakanoi, male A head B maxillary palp C pronotum D metaventrite E elytra F abdomen G mesotarsus H mesotarsal claws. Scale bar: 0.2 mm (A, C-G); 0.1 mm (B); 0.05 mm (H).

Figure 8. Male genitalia of Pseudophanias nakanoi A ventral view B lateral view C dorsal view D tergite VIII E sternite VIII. Scale bars: 0.1 mm.