Leptoplectus kijimunaa Jaloszynski & Nomura 2021, sp. n.

Leptoplectus kijimunaa Jałoszyński & Nomura sp. n. (Figs 1–27) Type material. Holotype: JAPAN (Okinawa Pref.): ♁, two labels: „JAPAN, OKINAWA Island / Rd. 58 Todoroki waterfall / - Michi-no-eki Kyoda, / ~ 10 m, roadside, 08.02.2019 / under bark of dead Vernicia / tree, leg. P. JAŁOSZYŃSKI” [white, printed], “ LEPTOPLECTUS / kijimunaa / Jałoszyński & Nomura / HOLOTYPUS ” [red, printed] (NSMT). Paratypes (12 exx.): 1 ♁, 3 ♀♀ (one disarticulated and mounted in Canada balsam), same data as for holotype; 2 ♁♁, same data except for 17.02.2019; 1 ♁, Yona, Kunigami-son, Okinawa Is., 18. ix. 2017, N. Tokushige leg.; 2 ♁♁, 1 ♀, same data except 7. x. 2017; 2 ♁♁, Mt. Nago-dake, Nago-shi, Okinawa Is., 22. xii. 2018, N. Tokushige leg. (paratypes in NSMT, MNHW, cPJ). Diagnosis. Elytra in both sexes infuscate, distinctly darker than other body parts; aedeagus with several conspicuously long and slender apical projections, in lateral view forming two separate groups, distoventral and distodorsal, and with transverse row of sparse long setae, in dorsal view situated on right side of median lobe; basal capsule of aedeagus symmetrical and with basal margin evenly rounded, lacking basal projection. Description. Body of male (Figs 1–2) moderately dark brown with distinctly infuscate elytra, setae slightly lighter than cuticle; BL 1.06–1.09 mm. Head (Figs 1–2, 5–6, 8) subtrapezoidal, flattened, broadest at eyes, HL 0.16–0.18 mm, HW 0.22–0.23 mm. Vertex and sides of frons weakly convex except for distinct subtriangular median impression on posterior margin of vertex and well-developed U-shaped frontal sulcus (Fig. 5; fs) restricted to anterior half of head dorsum, complete and equally deep on entire length, posteriorly ending in dorsal tentorial pits (Figs 5–6; dtp); eyes large, strongly convex and coarsely faceted; tempora in dorsal view subequal to eye length. Setiferous punctures on frons and vertex large but shallow, evenly, densely distributed except for impunctate frontal sulcus and small impunctate area on each supra-antennal tubercle, spaces between punctures equal to 1–2 diameters of punctures. Setae on frons and vertex dense, short and weakly suberect, one pair of lateral setae on posterior margin of vertex and one lateral pair within anterior, transverse portion of frontal sulcus distinctly longer and slightly thicker than remaining ones. Antennae (Fig. 3) distinctly shorter than head and pronotum together; AnL 0.26–0.29 mm; scape about as long as broad; pedicel indistinctly elongate; antennomeres 3–8 each distinctly transverse and subequal in width; antennomeres 9–11 forming distinct club, 9 and 10 strongly transverse, 11 only slightly longer than broad, distinctly longer than 9–10 combined. Scape and pedicel sparsely and unevenly covered with long erect setae; antennomeres 3–8 each with one ring of sparse erect setae; antennomeres 9–10 each with two rings of similar setae and additionally with sub-basal ring of several long digitiform sensilla; antennomere 11 with sides densely covered with evenly distributed, long erect setae, sub-median ring of several long digitiform sensilla, and deeply, asymmetrically excavated apex bearing cluster of several (8 or 9) large basiconic sensilla with rounded apices (Fig. 4; bcs). Tentorium (Fig. 6; t) reduced to separate vertical arms connecting with dorsal wall of head between anterior margins of eyes, and with ventral wall between posterior margins of eyes. Gular plate (Fig. 8; gp) with transverse microreticulation; posterior tentorial pits (Fig. 8; ptp) small, each slightly elongate and situated distinctly in front of neck region; entire ventral surface from anterior submental margin to posterior margins of genae and postgenae covered with punctures and setae similar to those on frons and vertex; additionally tempora with modified, flattened setae near occipital constriction; transverse impressions demarcating neck region from anterior portion of head capsule and area adjacent to posterior tentorial pits impunctate and asetose. Area at mesoventral margin of each eye with arcuate impression step-wise delimited from median region of head. Submentum (Fig. 8) with concave anterior margin; mentum subrectangular, with pair of anterior setae; labial palps with strongly elongate palpomere 2 and conspicuously long apical seta; cardines conspicuously large, quadrangular; lacinia and galea each elongate and with dense brush of setae along mesal and anterior margins; each mandible (Fig. 6; md) subtriangular, strongly elongate, with broad base, slender and sharply pointed distal portion and serrate mesal margin up to distal third; labrum (Fig. 7; lbr) with median emargination U-shaped, broad, and well-defined, with slightly obtuse-angled anteromesal and anterolateral corners; posterior, broadly subtriangular portion of labrum delimited by angulate, anteriorly convex dorsal transverse carina. Pronotum (Fig. 5) sub-pentagonal, broadest indistinctly in front of middle; PL 0.20–0.21 mm, PW 0.23–0.24 mm. Anterior margin slightly arcuate; lateral margins in anterior half rounded and smooth, in posterior half slightly sinuate and with several denticles (Fig. 9); posterior margin nearly straight at middle and weakly arcuate laterally. Pronotal disc with median longitudinal sulcus (Fig. 5; mls) developed as small and only slightly elongate impression near anterior 1/4; pair of large but shallow lateral antebasal foveae (Fig. 5; laf) slightly behind middle; and small, shallow median antebasal fovea (Fig. 5; maf) in posterior third; lateral and median foveae connected by barely discernible, diffuse transverse impression (not visible in SEM micrograph, but visible under stereomicroscope under certain lighting angles). Pronotal disc nearly evenly covered with punctures similar to those on frons and vertex, except for narrow area along posterior margin, covered with distinctly larger and denser punctures; rudiment of median longitudinal sulcus and median antebasal fovea impunctate; openings of lateral antebasal foveae covered with small, indistinct punctures. Basic vestiture of pronotal disc composed of dense, short and weakly suberect setae; additionally each side with two long, erect setae (visible in Fig. 9), and sides in anterior and posterior thirds with modified, flattened setae with truncate apices. Prosternum (Figs 8–9; pst) longer than procoxae, laterally fused with hypomera (i.e., notosternal sutures obliterated); prosternal carina between procoxae narrow and weakly elevated; anteroventral margin of prothorax deeply serrate; hypomeron with deep longitudinal hypomeral groove (Figs 8–9; hg) bearing rudiment of lateral fovea in precoxal region; distinct opening of fovea is also situated on arcuate carina demarcating procoxal rests from basisternal region (Figs 8–9; foveae indicated by arrowheads). Mesonotum (Fig. 10) with transverse, subrectangular mesoscutum (Fig. 10; sc2) and narrow, elongate mesoscutellum (Fig. 10; scl2) not delimited by scutoscutellar suture; scutellar shield exposed between elytral bases, but extremely small, barely discernible. Elytra (Figs 1–2, 5, 12) together subrectangular with rounded sides, broadest slightly behind middle; EL 0.33 mm, EW 0.30–0.32 mm. Each elytron with complete sutural sulcus (Fig. 5; ss), one short and diffuse discal sulcus in anterior 1/4, three dorsal basal elytral foveae (Fig. 5; bef), and one lateral fovea not visible in dorsal view (Fig. 12, indicated by arrowheads). Posterolateral elytral corner obtuse-angled; posterior elytral margin rounded; posterior sutural corner with small rounded projection (Figs 12, 17). Punctures on elytra much smaller than those on head and pronotum; setae similarly dense, short and suberect as those on pronotum; additionally area behind adsutural and discal basal foveae with 3–5 modified, flattened setae with pointed apices; similar setae are also distributed in one row just in front of posterior elytral margin (Fig. 17). Hind wings well developed, functional. Mesoventrite (Figs 13–14; v 2) transverse, with lateral regions fully demarcated from metaventrite. Mesoventral intercoxal process subtrapezoidal, elongate, posteriorly overlapped by anterior metaventral process. Anteromedian region of mesoventrite with pair of shallow transverse procoxal rests with transverse rows of microtrichia; subtrapezoidal area posterior to procoxal rests and mesoventral intercoxal process covered with scale-like microsculpture and several setae; sides of mesoventrite smooth and asetose. Three foveae are situated on mesoventrite (indicated by arrowheads in Fig. 14): pair of deep lateral foveae, and median fovea directed anterad; openings of lateral foveae with 4–5 modified, flattened setae with pointed apices; opening of median fovea asetose. Metanotum (Fig. 11) transverse, largely membranous, with short alacristae (Fig. 11; alc) restricted to anterior half of metascutum (Fig. 11; sc3); metascutellum not differentiated; metapostnotum (Fig. 11; pn3) long and broad. Metaventrite (Figs 13–14; v 3) distinctly transverse and weakly convex at sides, flattened at middle, with distinct anterior metaventral process, which, together with mesoventral process, separates mesocoxae; narrow area between metacoxae distinctly notched. Metaventrite with two pairs of lateral foveae, one just behind and laterad mesocoxal cavities, and one behind arcuate carina demarcating posteriorly mesocoxal rest (foveae indicated by arrowheads in Fig. 14). Metaventrite virtually impunctate and densely covered with short, nearly recumbent setae, except for asetose anterolateral regions laterad mesocoxae; additionally opening of each metaventral fovea and area lateroposterad each mesocoxa with several modified, flattened setae with pointed apices. Metafurca (Fig. 14; fur) nearly T-shaped, with long stalk and strongly divergent lateral arms. Legs short and robust, lacking any peculiar characters. Abdomen (Figs 15–22) only slightly longer than elytra, AbL 0.35–0.38 mm, AbW 0.28 m

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