Three Littoral Athetini (Coleoptera: Staphylinidae: Aleocharinae) Species New to Korea Jong-Seok PARK, Mi-Jeong JEON and Kee-Jeong AHN

Entomological Research 37 (2007) 208–212

RESEARCHBlackwell Publishing Ltd PAPER Three littoral Athetini (Coleoptera: Staphylinidae: Aleocharinae) species new to Korea Jong-Seok PARK, Mi-Jeong JEON and Kee-Jeong AHN

Department of Biology, Chungnam National University, Daejeon, Korea

Correspondence Abstract Kee-Jeong Ahn, Department of Biology, Chungnam National University, Daejeon Three littoral Athetini species – Adota magnipennis (Bernhauer), Atheta ririkoae 305-764, Korea. Email: [email protected] Sawada and Atheta tokiokai (Sawada) – are reported for the ﬁrst time in Korea. Diagnoses, illustrations of the habitus and line drawings of diagnostic characters are Received 15 May 2007; accepted 30 June provided. 2007. Key words: Adota, Aleocharinae, Atheta, Coleoptera, Korea, littoral, Staphylinidae, taxonomy. doi: 10.1111/j.1748-5967.2007.00114.x

Introduction Results The Athetini Casey (1910), containing more than 173 genera, Genus Adota Casey, 1910 (Korean name: is the largest aleocharine tribe and is undoubtedly one of the Ba-da-ban-nal-gae-sok) most systematically difﬁcult groups of Staphylinidae (Ashe 2001). It is very poorly characterized, but can be recognized Adota Casey, 1910: 67. by the combination of the following characters: maxillary Type species: Atheta massettensis Casey, 1910. palpi with four palpomeres; labial palpi with three palpomeres; head without neck; pronotum wider than long; mesocoxa Adota magnipennis (Bernhauer, 1943) (Korean name: Ba- separated, tarsal formula 4-5-5; and athetine bridge of da-ban-nal-gae) median lobe present (Seevers 1978). (Figs 1, 4, 7, 10, 13, 16) While working on the littoral staphylinid beetle collection Atheta (Anopleta) magnipennis Bernhauer, 1943: 184; in the Natural History Museum, Hannam University Benick, 1970: 94. (HUNHM), Daejeon, Korea, we found three athetine species Atheta (Halostiba) magnipennis: Yosii and Sawada, 1976: new to Korea. In this paper, we report the genus Adota Casey 88; Sawada, 1977: 173. and three species – Adota magnipennis Bernhauer, Atheta Adota magnipennis: Gusarov, 2003: 20; Smetana, 2004: ririkoae Sawada and Atheta tokiokai (Sawada) – for the ﬁrst 366. time in Korea. Because Sawada (1971, 1989), and Yosii and Diagnostic combination. Length 1.7–2.4 mm. Body parallel- Sawada (1976) have described these species in detail sided, pubescent, brownish black, antennae and legs based on chaetotaxy and microstructures, we provide here a dark brown. Antennomere (Fig. 4) 1 longest, 2 longer than 3, diagnostic combination, habitus photos and line drawings of 4–10 transverse. Head as wide as pronotum. Pronotum diagnostic characters. approximately 1.17 times wider than long. Elytra wider than Preparation of permanent microscopic slides was per- long, approximately 1.63 times longer than wide. Length formed using the techniques described by Hanley and Ashe ratio of mesosternal process, isthmus and metasternal (2003). Materials examined in this study are deposited in the process 4:5:12. Median lobe as in Figures 10 and 13. Chungnam National University Insect Collection (CNUIC), Spermatheca as in Figure 16. See Yosii and Sawada (1976) Daejeon, Korea. for a detailed description.

Three littoral athetine species

Figures 1–3 1 Adota magnipennis, 2.3 mm; 2 Atheta ririkoa, 2.5 mm; 3 Atheta tokiokai, 2.8 mm.

Table 1 Differences among Adota magnipennis, Atheta ririkoae and Atheta tokiokai

Adota magnipennis Atheta ririkoae Atheta tokiokai

Body length 1.7–2.4 mm 2.0–3.0 mm 2.0–3.0 mm Antennomeres 4–10 transverse (Fig. 4) 4–7 subquadrate, 4–7 rectangular, 8–10 weakly transverse (Fig. 5) 8–10 subquadrate (Fig. 6) Ratio of mesosternal process, isthmus 4:5:12 (Fig. 7) 6:5:11 (Fig. 8) 7:3:18 (Fig. 9) and metasternal process Median lobe Figs 10,13 Figs 11,14 Figs 12,15 Spermatheca Fig. 16 Fig. 17 Fig. 18

Adota magnipennis can be distinguished from Atheta Atheta ririkoae Sawada, 1989 (Korean name: ririkoae and A. tokiokai by a slim body, antennal shape and Ba-da-ba-su-yeom-ban-nal-gae) the shape of the median lobe (Table 1). (Figs 2, 5, 8, 11, 14, 17) Material examined. 61, Hyebje-beach, Hanrim-eup, Atheta (Badura) ririkoae Sawada, 1989: 285; Smetana, Bukjeju-gun, Jeju Province, Korea, 19.v.2004, Y.B. Cho, ex 2004: 377. under seaweeds (2, on slide). Diagnostic combination. Length 2.0–3.0 mm. Body Distribution. Korea (Jeju Island), Japan. reddish brown, antennae and legs yellowish brown. Antennomere (Fig. 5) 1 longest, 2 longer than 3, 4–7 subquadrate, 8–10 weakly transverse. Pronotum wider Genus Atheta Thomson, 1858 than head, approximately 1.35 times wider than long. Elytra Atheta Thomson, 1858: 36. approximately 1.40 times longer than wide. Length ratio Type species: Aleochara graminicola Gravenhorst, 1806. of mesosternal process, isthmus and metasternal process

J.-S. Park et al.

metasternal process, and the shape of the median lobe (Table 1). Material examined. 20, Mangsang Beach, Kangwon Province, Korea, 5.vii.1991, K.J. Ahn, ex under decaying seaweed (22, on slide). Distribution. Korea, Japan.

Atheta tokiokai (Sawada, 1971) (Korean name: Hae-an-ba-su-yeom-ban-nal-gae) (Figs 3, 6, 9, 12, 15, 18) Ischnopoda (Dinaraea) tokiokai Sawada, 1971: 306. Atheta (Badura) tokiokai: Yosii and Sawada, 1976: 39; Smetana, 2004: 377. Diagnostic combination. Length 2.0–3.0 mm. Body dark brown, antennae and legs yellowish brown. Antennomere (Fig. 5) 1 longest, 2 longer than 3, 4–7 rectangular, 8–10 subquadrate. Pronotum wider than head, approximately 1.33 times wider than long. Elytra approximately 1.46 times longer than wide. Length ratio of mesosternal process, isthmus and metasternal process 7:3:18. Median lobe (Figs 12,15) slender, apical lobe smaller than that of Atheta tokiokai, and the shape of internal sac differs from A. tokiokai. Spermatheca as in Figure 18. See Sawada (1971, Yosii & Sawada 1976) for a detailed description. Atheta tokiokai can be distinguished from A. ririkoae by antennal shape, ratio of mesosternal process, isthmus and metasternal process and the shape of median lobe (Table 1). Material examined. 65, Yongduam, Cheju Province, Korea, 2.vii.1991, K.J. Ahn, ex under seaweed on rocks (31, on slide); 11, Moseulpo Beach, Daejeong-eub, Figures 4–6 Antenna, dorsal aspect: 4 Adota magnipennis; 5 Atheta ririkoae; 6 Atheta tokiokai. Scale lines, 0.1 mm. Namjeju-gun, Jeju Province, Korea, 8.viii.2000, Y.B. Cho, ex under seaweed. Distribution. Korea, Japan. 6:5:11. Median lobe (Figs 11,14) slender, apical lobe bigger than that of Atheta tokiokai, and the shape of internal sac Acknowledgments differs from A. tokiokai. Spermatheca as in Figure 17. See Sawada (1989) for a detailed description. We thank Dr Y.B. Cho (Natural History Museum, Hannam Atheta ririkoae can be distinguished from A. tokiokai by University, Daejeon, Korea) for providing specimens. This antennal shape, ratio of mesosternal process, isthmus and research is supported by a Korean Institute of Environmental

Figures 7–9 Mesosternum and meta- sternum, ventral aspect: 7 Adota magnipennis (I, length of mesosternal process; II, length of isthmus; III, length of metasternal process); 8 Atheta ririkoae; 9 Atheta tokiokai. Scale lines, 0.1 mm.

Three littoral athetine species

Figures 10–18 Median lobe and spermatheca. 10–12 Median lobe, lateral aspect: 10 Adota magnipennis; 11 Atheta ririkoae; 12 Atheta tokiokai. 13–15 Median lobe, dorsal aspect: 13 Adota magnipennis; 14 Atheta ririkoae; 15 Atheta tokiokai. 16–18 Spermatheca, dorsal aspect: 16 Adota magnipennis; 17 Atheta ririkoae; 18 Atheta tokiokai. Scale lines, 0.1 mm.

Science and Technology Ministry and Environment Grant Gravenhorst JKC (1806) Monographia Coleopterorum Micro- (KIEST 052-052-040, 2007) to K.-J. Ahn. pterorum. Henricus Dieterich, Gottingae. Gusarov VI (2003) A revision of Nearctic species of the genera Adota Casey, 1910 and Psammostiba Yosii & Sawada, 1976 References (Coleoptera: Staphylinidae: Aleocharinae). Zootaxa 185: 1–35. Ashe JS (2001) Aleocharinae. In: Newton AFJ, Thayer MK, Hanley RS, Ashe JS (2003) Techniques for dissecting adult Ashe JS, Chandler DS (eds) 22. Staphylinidae Latreille, aleocharine beetles (Coleoptera: Staphylinidae). Bulletin of 1802. In: Thomas MC, Arnett RHJ (eds) American Beetles, Entomological Research 93: 11–18. Volume 1, Archostemata, Myxophaga, Adephaga, Ployphaga: Sawada K (1971) Aleocharinae (Staphylinidae, Coleoptera) from the Staphyliniformia, pp. 272–418. CRC Press, Florida, Boca Campus of the Seto Marine Biological Laboratory. Publications Raton. of the Seto Marine Biological Laboratory 18: 291–315. Benick G (1970) Revision der Untergattung Anopleta Muls. et Rey. Sawada K (1977) Studies on the genus Atheta Thomson and its Entomologische Blätter 66: 83–110. allies (Coleoptera, Staphylinidae). III: Japanese species described Bernhauer M (1943) Neuheiten der palaearktischen Staphylini- by the previous authors. Contributions from the Biological denfauna. Mitteilungen der Münchner Entomologischen Laboratory Kyoto University 23 (2): 171–222. Gesellschaft 33: 169–188. Sawada K (1989) New Species of Aleocharinae from Japan, I Casey TL (1910) New Species of the Staphylinid Tribe Myrmedoniini. (Staphylinidae; Coleoptera). Contributions from the Biological The New Era Printing Company, Lancaster. Laboratory Kyoto University 27 (20): 273–307.

Seevers CH (1978) A generic and tribal revision of the North Öfversigt af Kongl. Vetenskaps-Akademiens Förkhandlingar American Aleocharinae (Coleoptera: Staphylinidae). Fieldiana: 15: 27–40. Zoology 71: 1–275. Yosii R, Sawada K (1976) Studies on the genus Atheta Thomson Smetana A (2004) Subfamily Aleocharinae Fleming, 1821. In: and its allies (Coleoptera, Staphylinidae). II: Diagnostic characters Löbl I, Smetana A (eds) Catalogue of Palaearctic Coleoptera. of genera and subgenera with description of representative Volume 2. Hydrophiloidea, Histeroidea, Staphylinoidea, species. Contributions from the Biological Laboratory Kyoto pp. 353–494. Apollo Books, Denmark, Stenstrup. University 23 (1): 11–140. Thomson CG (1858) Försök till uppställning sf Sveriges Staphyliner.