Nogunius sokani, Jałoszyński, 2020

Jałoszyński, Paweł, 2020, Himaloconnus Franz and Nogunius gen. n. of Japan (Coleoptera: Staphylinidae Scydmaeninae), Zootaxa 4822 (3), pp. 334-360 : 351-356

publication ID	https://doi.org/ 10.11646/zootaxa.4822.3.2
publication LSID	lsid:zoobank.org:pub:86DC1241-FE11-49CC-9674-ACAB1DF92F62
DOI	https://doi.org/10.5281/zenodo.4401599
persistent identifier	https://treatment.plazi.org/id/525F87CC-FF8D-FF9E-9BED-FE07FADEFE5A
treatment provided by	Plazi
scientific name	Nogunius sokani
status	sp. nov.

Treatment

Nogunius sokani sp. n.

( Figs 45–46 View FIGURES 45–52 , 53–72 View FIGURES 53–59 View FIGURES 60–63 View FIGURES 64–68 View FIGURES 69–76 )

Type material. Holotype: JAPAN (Okinawa Pref.): ♂, two labels: “JAPAN, OKINAWA Pref. / Okinawa-jima, Mt. Nago-dake / Nago-shi , 7.ix.2003 / S. Arai leg. (Tullgren) ” [white, printed], “ NOGUNIUS / sokani m. / HO- LOTYPUS, P. JAŁOSZYŃSKI, 2020” [red, printed] ( NSMT) . Paratypes (2 exx.): 1 ♀, “[Okinawa: RYUKYU] / Haneji (100m alt.) / NW of Mt. Tanodake / Nago 25.X. 1987 / Y. Nishikawa leg” ( EUMJ); 1 ♀ (disarticulated, mounted in Canada balsam), “JAPAN, OKINAWA island / Nago City, Nago Castle Site, ∼ 100 m, 11.02.2019 / humid forest, Nature Path / leg. P. Jałoszyński ” (cPJ) .

Diagnosis. Eyes in male conspicuously large, in dorsal view slightly longer than tempora; aedeagus in ventral view about three times as long as broad, with apical margin indistinctly bisinuate.

Description. Body of male ( Fig. 45 View FIGURES 45–52 ) strongly convex, uniformly light brown, covered with setae distinctly lighter than cuticle; BL 0.80 mm.

Head ( Fig. 46 View FIGURES 45–52 ) broadest at eyes, HL 0.13 mm, HW 0.18 mm; tempora in dorsal view slightly shorter than eyes; vertex and frons confluent, together weakly convex; each eye large, strongly convex, bean-shaped, with distinct posteromedian emargination, composed of 24 large facets of equal diameters. Punctures on vertex fine, inconspicuous; setae short, sparse and suberect; tempora and posterior margin of vertex densely covered with thick bristles; additionally two long lateral setae can be seen on the posterior margin of vertex. Antennae slender, AnL 0.35 mm, antennomeres I and II each strongly elongate, III–VIII each about as long as broad or indistinctly transverse, IX distinctly larger than VIII, slightly transverse, X much larger than IX, strongly transverse, XI indistinctly narrower and slightly longer than X, about as long as broad.

Pronotum subconical with strongly rounded sides, broadest shortly in front of base; PL 0.23 mm, PW 0.20 mm. Anterior and posterior margins weakly convex, base with two pairs of small, distinct pits. Punctures on pronotal disc fine, inconspicuous; setae sparse, short, suberect; sides, especially posteriorly, with sparse, thick bristles.

Elytra together oval, broadest indistinctly in front of middle; EL 0.45 mm, EW 0.35 mm, EI 1.29; humeral calli weakly elevated, basal impressions large, deep, nearly circular; apices separately rounded. Punctures inconspicuous; setae slightly longer and denser than those on pronotum, suberect.

Legs moderately long and slender, unmodified.

Aedeagus ( Figs 69–72 View FIGURES 69–76 ) elongate, in ventral view about three times as long as broad; AeL 0.13 mm; median lobe in ventral view broadest in sub-basal region, with weakly rounded sides slightly narrowing toward truncate apex, apical margin indistinctly bisinuate, with weakly marked median projection; in lateral view median lobe distinctly curved, with ventral subapical projection; parameres slender, each with one long apical and one long subapical seta.

Female similar to male, but with distinctly smaller, less convex eyes, each composed of 17 ommatidia; antennae slightly shorter in relation to body, and elytra slightly stouter. BL 0.83 mm; HL 0.15 mm, HW 0.15 mm, AnL 0.30 mm; PL 0.25 mm, PW 0.23 mm; EL 0.43 mm, EW 0.35 mm, EI 1.21.

Distribution. Yambaru, i.e., the northern, forested region of Okinawa-jima ( Fig. 85 View FIGURE 85 ).

Etymology. The adjective sokani is in honor of Noguni Sôkan. For details, see the etymology of Nogunius .

Remarks. Species of Nogunius are morphologically uniform and it is difficult to identify them by external characters. Males of Nogunius sokani have remarkably large eyes, in dorsal view slightly longer than tempora; only males of N. aogashimanus have comparably large eyes. All remaining species of Nogunius have eyes clearly shorter than tempora. Nogunius sokani inhabits Okinawa-jima, the main island of the Ryukyus, ∼ 1,300 km SW of the small island of Aogashima of the Izu archipelago, where N. aogashimanus occurs. The eyes of N. sokani are slightly larger and slightly more convex than those in N. aogashimanus , and the aedeagi, although similar, differ markedly in the apical region of the median lobe. In ventral view, the aedeagal apex in N. sokani is truncate with only an indistinct trace of a median projection, whereas that in N. aogashimanus has a subtriangular median projection.