Liogluta rufescens Lee & Ahn

Lee, Seung-Gyu & Ahn, Kee-Jeong, 2016, A taxonomic review of Korean Liogluta Thomson (Coleoptera, Staphylinidae, Aleocharinae) with descriptions of three new species, Zootaxa 4193 (2), pp. 285-303 : 299-301

Liogluta rufescens Lee & Ahn , sp. nov.

( Figs. 1 G, 8)

Description. Length 2.0– 2.3 mm. Body ( Fig. 1 G) parallel-sided; surface fairly glossy and densely pubescent, with microsculpture. Body reddish brown; head reddish black; elytra and legs paler, yellowish brown; abdominal segments V–VIII darker than other segments. Head. Subquadrate, approximately 1.0–1.1 times as wide as long, widest across eyes, slightly narrower than pronotum; eyes moderate in size and slightly prominent, about 1.0–1.2 times as long as temples; gular sutures moderately separated, diverged basally; infraorbital carina complete; cervical carina complete. Antennae ( Fig. 8 A) long and slender; antennomeres 1–3 elongate, 1 longest, 2 slightly longer than 3, 4–10 subquadrate to slightly transverse, 11 longer than wide, about as long as preceding two combined. Mouthparts. Labrum transverse, emarginate in anterior margin, with ε-sensillum and about 9 macrosetae on each side of midline; epipharynx with several sensilla, including 2 lateral sensory rows on each side of midline; α-sensillum long and setaceous, about 2.0 times as long as ε-sensillum, β- and γ-sensilla very short. Mandibles asymmetrical, subtriangular, decurved and pointed apically, about 1.5–1.6 times as long as basal width; minute denticles present in molar region; right one with small internal tooth, internal margin slightly serrulate; prostheca developed, composited three portions. Galea and lacinia of maxilla long and slender; lacinia composited seven spines in distal comb region, contiguous with two isolated spines; maxillary palpus elongate, with pubescence and long setae; palpomere 1 smallest, 2 about 2.5–2.7 times as long as wide, 3 slightly longer than 2, about 2.4–2.6 times as long as wide, 4 digitiform, filamentous sensilla not reaching to basal half. Labium with ligula elongate, divided into 2 lobes in basal half; prementum with two medial setae widely separated; two basal pores moderately separated, about 2.0 times width of basal pore; several medial pseudopores, 1 setal pore and 2 real pores present on each side of midline; labial palpus with many setulae; palpomere 1 largest, about 1.5–1.7 times as long as wide, γ-setula contiguous with b-seta, 2 shortest, about 1.2–1.4 times as long as wide, 3 parallelsided and about as long as 1, about 3.0 times as long as wide. Mentum trapezoidal, anterior margin almost straight; v-seta relatively long, close to u-setae. Thorax. Pronotum slightly transverse, approximately 1.2–1.3 times as wide as long, widest in apical third; hypomera fully visible in lateral aspect. Metanotal scutum with 1 long seta and about 2 relatively short setae on each side of midline. Mesocoxal cavities moderately separated, mesoventral process pointed at apex, slightly longer than isthmus and metaventral process combined; isthmus about as long as metaventral process. Elytra longer and slightly wider than pronotum; elytron approximately 1.4–1.5 times as long as wide, pubescence directed posteriorly and postero-laterally; postero-lateral margin straight; hind wings fully developed, flabellum composed of about 6 long setose lobes. Legs. Slender and long, with pubescence and macrosetae; tibiae with different length of two spurs at apex; tarsal formula 4-5-5, meso- and metatarsomere 1–4 subequal in length; one empodial seta present, shorter than claw. Abdomen. Parallel-sided; surface fairly glossy and densely pubescent, with imbricate microsculpture; macrochaetal arrangement of tergites II–VI 01-13-13 -13-13; male tergite VIII ( Fig. 8 B) with 4 macrosetae on each side of midline, broad process present in median region and posterior margin denticulate; male sternite VIII ( Fig. 8 C) with 9 macrosetae on each side of midline, posterior margin slightly convex, with inconspicuous marginal setae; posterior margin of female tergite VIII subtruncate; posterior margin of female sternite VIII slightly emarginate, with conspicuous and long marginal setae, minute setae in median region. Aedeagus. Median lobe ( Figs. 8 D–E) narrowly ovate and widest in basal fourth, apical process elongate and parallel-sided, convergent at apex in ventral aspect; internal sac developed. Apical lobe of paramerites ( Fig. 8 F) with four setae; a-seta longest, c- and d-setae shorter than b-seta, close together and positioned apically.

Type material. Holotype, ♂, labeled as follows: ‘ KOREA: Seoul, Dobong-gu, Mt. Bukhansan , 24 III 1988, Y. S. Kim, ex leaf litter ; HOLOTYPE Liogluta rufescens Lee and Ahn 2016 ’. Desig. S.-G. Lee and K.-J. Ahn 2016. Paratypes, 3 exx. (one on slide), same data as Holotype.

Distribution. Korea (South).

Remarks. Adults are very similar to those of L. distans , but can be distinguished by the characters provided in the key and different shape and structure of aedeagus.

Etymology. Named from the Latin rufescens meaning ‘‘red, reddish” which refers to the body color.

Figures

FIGURE 1. Habitus of Liogluta. A, L. changwhani sp. nov.; B, L. distans; C, L. granigera; D, L. infans. E, L. jinilli sp. nov.; F, L. pyonganica; G, L. rufescens sp. nov.; H, L. ursi.

FIGURE 8. Liogluta rufescens sp. nov. A, antenna; B, male abdominal tergite VIII (dorsal aspect); C, male abdominal sternite VIII (ventral aspect); D, median lobe of aedeagus (lateral aspect); E, median lobe of aedeagus (ventral aspect); F, paramere (lateral aspect). Scales = 0.1 mm.