Atheta (Bessobia) occulta (Coleoptera: Staphylinidae: Aleocharinae) New to Korea

Thomson (1858) first proposed the genus name Bessobia based on Homalota monticola Thomson. Since Ganglbauer (1895) treated it as a subgenus of the genus Atheta Thomson, many researchers (Fenyes, 1920; Palm, 1970; Benick and Lohse, 1974; Yosii and Sawada, 1976; Smetana, 2004 etc.) followed this subgeneric assignment.

The Atheta subgenus Bessobia contains 24 species in the Palaearctic region. In East Asia, 12 species and one species were recorded in China and in Japan, respectively (Schülke and Smetana, 2015). They are common in diverse microhabitats such as decaying organism and straw piles.

While working on Korean Athetini, Atheta subgenus Bessobia and the species, A. (B.) occulta (Erichson) is discovered in the

Korean Peninsula. The first author compared Korean specimens with syntypes deposited in the Museum für Naturkunde (MNHB), Berlin, Germany to have more reliable identification.

In this paper, we present a redescription, habitus photograph, and illustrations of the diagnostic characters. All specimens are deposited in the Chungnam National University Insect Collection (CNUIC), Daejeon, Korea. Terms used here followed Sawada (1972) but we followed Ashe (1984) in some cases to avoid confusion.

Taxonomic Accounts

Genus Atheta Thomson, 1858 우리바수염반날개속

Subgenus Bessobia Thomson, 1858 긴바수염반날개아속 ( 신칭)

Bessobia Thomson, 1858: 35 (type species: Homalota monticola

Short communication KOREAN JOURNAL OF APPLIED ENTOMOLOGY

한국응용곤충학회지 ⓒ The Korean Society of Applied Entomology

Korean J. Appl. Entomol. 58(4): 265-270 (2019) pISSN 1225-0171, eISSN 2287-545X

DOI: https://doi.org/10.5656/KSAE.2019.10.0.040

Atheta (Bessobia) occulta (Coleoptera: Staphylinidae: Aleocharinae) New to Korea

Seung-Gyu Lee and Kee-Jeong Ahn ¹ *

Division of Forest Biodiversity, Korea National Arboretum, Pocheon 11186, Korea

1

Department of Biology, Chungnam National University, Daejeon 34134, Korea

긴바수염반날개의 국내 첫 보고

이승규ㆍ안기정 ¹ *

국립수목원 산림생물다양성연구과, ¹충남대학교 생물과학과

ABSTRACT: Atheta (Bessobia) occulta (Erichson) is newly discovered in the Korean peninsula. A redescription, habitus photograph, and illustrations of diagnostic characters are provided.

Key words: Coleoptera, Staphylinidae, Aleocharinae, Atheta (Bessobia) occulta

초 록 : 긴바수염반날개[Atheta (Bessobia) occulta (Erichson)] (신칭)를 한반도에서 처음으로 보고한다. 이 종에 대한 재기재, 체형사진 및 식별형질 에 대한 삽화를 제시한다.

검색어: 딱정벌레목, 반날개과, 바수염반날개아과, 긴바수염반날개

*Corresponding author: [email protected]

Received September 25 2019; Revised October 28 2019 Accepted October 31 2019

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0)

Thomson, 1852).

Trichiota Mulsant and Rey, 1873: 180 (type species: Bessobia gibbera Mulsant and Rey, 1873 = Bessobia fungivora Thomson, 1867).

Diagnosis. Members of the Atheta subgenus Bessobia can be distinguished from other subgenera of Atheta by the combi- nation of the following characters: infraorbital carina incomplete;

antennomere 2 about as long as 3 (Fig. 3B); midline of pronotal pubescence directed posteriorly (Fig. 3C) or anteriorly in basal half to fourth and posteriorly in apical half to fourth; mesoventral process distinctly pointed at apex (Fig. 3F); abdominal tergite II with 2 macrosetae on each side of midline, III with anterior macrosetae; VIII with about 6 macrosetae on each side of midline in most (Figs. 4A and C) and longitudinal ridges along lateral margins (Fenyes, 1920; Benick and Lohse, 1974; Yosii and Sawada, 1976).

Distribution. Korea, China, India, Japan, Nepal, Mongolia, Russia, Europe, North Africa and Nearctic region.

Atheta (Bessobia) occulta (Erichson, 1837) 긴바수염반날개 ( 신칭)

(Figs. 1, 2A~F, 3A~H, 4A~H)

Aleochara foveata Stephens, 1832: 111.

Aleochara assimillis Stephens, 1832: 117.

Homalota occulta Erichson, 1837: 317.

Bessobia nebulosa Mulsant and Rey, 1873: 180.

Bessobia diversipes Mulsant and Rey, 1875: 135.

Atheta (Bessobia) occulta: Ganglbauer, 1895: 202; Fenyes, 1920: 216; Palm, 1970: 246; Benick and Lohse, 1974: 149;

Yosii and Sawada, 1976: 80; Smetana, 2004: 377; Schülke and Smetana, 2015: 524.

Atheta erichsoni Bernhauer, 1907: 397.

Redescription . Body length 3.0-3.8 mm, parallel-sided; surface glossy, densely pubescent; dark brown to black; head, pronotum and abdomen almost black; elytra slightly paler; legs brown.

Head. Subquadrate (Fig. 3A), approximately 1.1 times as wide as long, slightly narrower than pronotum; eyes about 1.3 times longer than temples; behind eyes convex; gular sutures moder- ately separated. Antennomere 4 about as long as wide, 5-10 subquadrate to slightly transverse, 11 longer than wide (Fig.

3B). Mouthparts. Labrum (Fig. 2A) with ε-sensillum and 9 macrosetae on each side of midline; epipharynx (Fig. 2B) with α-sensillum long and setaceous, more than 2.0 times as long as ε-sensillum; β- and γ-sensilla short. Mandibles (Figs. 2C and D) asymmetrical, about 1.5-1.6 times as long as basal width;

right one (Fig. 2C) with small internal tooth. Galea and lacinia of maxilla (Fig. 2E) long and slender; palpomere 1 smallest, 2 about 2.7-2.9 times longer than wide, 3 slightly longer than 2, about 2.6-2.8 times as long as wide, 4 digitiform. Labium (Fig.

2F) with ligula long and slender, divided into 2 lobes in basal half; prementum with two medial setae moderately narrow separated; two basal pores close together, about 1.0 times width of basal pore; several medial pseudopores, few lateral pseudopores, 1 setal pore and 2 real pores present on each side of midline; labial palpus elongate, with many setulae; palpomere 1 largest, about 1.4-1.6 times longer than wide, with γ-setula close to b-seta, 2 shortest, about 1.4-1.6 times longer than wide, 3 subparallel-sided and about as long as 1, about 3.0-3.5 times longer than wide. Mentum as in Fig. 2F. Thorax. Pronotum (Fig. 3C) slightly transverse, approximately 1.2 times as wide as long. Prosternum as in Fig. 3D. Metanotal scutum (Fig. 3E)

Fig. 1. Habitus of Atheta (Bessobia) occulta (male), 3.5 mm.

with 1 long seta and about 5-8 short setae on each side of midline. Mesoventral process (Fig. 3F) slightly longer than isthmus and metaventral process combined; length ratio of mesoventral process, isthmus and metaventral process 17:10:3.

Elytra slightly longer and wider than pronotum; elytron (Fig.

3H) approximately 1.7 times as long as wide, pubescence directed posteriorly and postero-laterally; postero-lateral margin

almost straight; flabellum (Fig. 3E) composed of about 6-9 long setose lobes. Legs. with dense pubescence and macrosetae;

meso- and metatibiae with different length of two spurs at apex; length ratio of tarsomeres 31:34:40:94 (protarsus); 36:

42:45:47:97 (mesotarsus); 53:54:55:53:114 (metatarsus); one

empodial seta present, shorter than claw. Abdomen. Macrochaetal

arrangement of tergites II-VI 02-13-23-23-23; tergites III-VI

Fig. 2. Atheta (Bessobia) occulta. A: labrum (dorsal aspect); B: epipharynx (ventral aspect); C: right mandible (dorsal aspect); D: left

mandible (ventral aspect); E: left maxilla (ventral aspect); F: labium (ventral aspect).

Fig. 3. Atheta (Bessobia) occulta. A: head (ventral aspect); B: antenna; C: pronotum (dorsal aspect); D: prosternum (ventral aspect); E:

metanotum (dorsal aspect); F: meso- and metaventrites (ventral aspect); G: scutellum (dorsal aspect); H: elytron (dorsal aspect).

impressed in basal region; posterior margin of male tergite VIII (Fig. 4A) with a broad process almost truncate at apex, imbricate microsculpture present; male sternite VIII (Fig. 4B) with about 10-12 macrosetae on each side of midline; female tergite VIII (Fig. 4C) with about 5 macrosetae on each side of midline; female sternite VIII (Fig. 4D) with long and short marginal setae, minute setae present in median region.

Aedeagus. Median lobe (Figs. 4E and F) ovate, apical process convergent in ventral aspect; apical process elongate and

slightly bent in lateral aspect. Apical lobe of paramerites (Fig.

4G) slightly elongate and subparallel-sided, blunt at apex.

Spermatheca. Bursa elongate, with large umbilicus; duct slender and transversely contorted, deflected at apex (Fig. 4H).

Type material. Syntypes, 6 exx., labeled as follows: ‘5352, occulta Er. Berol. Er.’.

Material examined. SOUTH KOREA: Chungbuk Prov.: 1 ex., Yeongdong-gun, Sangchon-myeon, Mulhan-ri, Mt. Minjuji- san, N36 ˚03'35.22" E127˚52'31.26", 518 m, 13 v 2011, JG Lee, Fig. 4. Atheta (Bessobia) occulta. A: male abdominal tergite VIII (dorsal aspect); B: male abdominal sternite VIII (ventral aspect); C: female abdominal tergite VIII (dorsal aspect); D: female abdominal sternite VIII (ventral aspect); E: median lobe of aedeagus (lateral aspect); F:

median lobe of aedeagus (ventral aspect); G: paramere (lateral aspect); H: spermatheca. Scales = 0.1 mm.

TK Kim, SG Lee, decaying persimmon. Chungnam Prov.: 9 exx., Daejeon-si, Yuseong-gu, Ansan-dong, N36°24 ′43.9″

E127°17 ′25.2″, 13 xii 2011, YH Kim, SG Lee, straw piles.

Gangwon Prov.: 1 ex., Pyeongchang-gun, Mt. Odaesan, Sangwonsa, 18 v 2002, SJ Park, SW Shin. Gyeonggi Prov.: 2 exx. (one on slide), Namyangju-si, Hwado-eup, Mt. Cheonmasan, 21 v 1984 Ys Kim; 2 exx., Seoul-si, Mt. Cheonggyesan, 15 iv 1989, KJ Ahn; 1 ex., Seoul-si, Gangnam-gu, 20 iv 1985, YS Kim; 1 ex., Seoul-si, Dobong-gu, Taeneung, 16 iv 1988, YS Kim.

Gyeongnam Prov.: 9 exx. (one on slide), Jinju-si, Gajwa-dong, Gyeongsang univ., 9 iii 2003, CS Lim, bait trap; 1 ex. (on slide), same data as former except for ‘8 iii 2003’; 2 exx. (on slide), same data as former except for ‘12 iii 2003’. Jeju Prov.:

Seogwipo-si, 18 ii 1986, YS Kim.

Distribution. Korea (South), China (Beijing), Japan, Russia (Siberia, North European Territory), Turkey, Europe and North Africa.

Remarks. This species is widely distributed in the Palae- arctic region and is recorded here for the first time in Korea. As Yosii and Sawada (1976) pointed out, the number of macrosetae on tergite VIII is variable of ranging 5-7 on each side of midline in this species. We examined four slide-mounted specimens.

Acknowledgments

We thank Johannes Frisch (MNHB, Berlin) for providing valuable specimens. This work was supported by a grant from the National Institute of Biological Resources (NIBR), funded by the Ministry of Environment (MOE) of the Republic of Korea (NIBR201901203).

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