Gyrinus (s. str.) japonicus Sharp, 1873

Lee, Dae-Hyun & Ahn, Kee-Jeong, 2015, A taxonomic review of the Gyrinidae (Coleoptera) in Korea, ZooKeys 509, pp. 87-107 : 91-93

Taxon classification Animalia Coleoptera Gyrinidae

Gyrinus (s. str.) japonicus Sharp, 1873 Figs 3, 15-17, 19-22, 26-28, 47-49, 58

Gyrinus japonicus Sharp, 1873: 55.

Gyrinus (Gyrinus) japonicus : Cheo (1934: 210).

Gyrinus japonicus francki Zaitzev, 1953: 355. Synonymized by Mazzoldi (2003: 27).

Type specimens examined.

Syntypes: 1 ♂ 1 ♀ (NHM), with labels as follows: " Gyrinus japonicus Types D. S. Yokohama. Lewis, Type, Sharp Coll. 1905-313., Japan. G. Lewis.".

Additional material examined.

NORTH KOREA: 6 ♂♂ 9 ♀♀, Pyongyang-city, Around Pyongyang-Hotel, Near Daedong-River, 15 vii 2008, Changdo Han; 16 ♂♂ 13 ♀♀, Pyongyang-city, Mt. Daesong-San, 24.VI.2009, Changdo Han. SOUTH KOREA: Chungbuk Prov.: 1 ♂, Yeongdong-gun, Yongsan-myeon, Sinhang-ri, 9.V.2009, SH Lee, pond; Chungnam Prov.: 1 ♂, Daejeon-si, Yusong-gu, Gyesan-dong, Sutonggol, 11.VII.1999, KJ Ahn, valley; 8 ♂♂ 12 ♀♀, Gongju-si, Banpo-myeon, Hakbong-ri, Mt. Gyeoryongsan, 25.VII.1992, SH Lee; 2 ♀♀, Yesan-gun, Deoksan-myeon, Sacheon-ri, Surak-temple, 26.VII.1995, SH Lee; Gangwon Prov.: 7 ♂♂ 6 ♀♀, Samcheok-si, Geundeok-myeon, Hamaengbang-ri, Chodang-reservoir, 7.IX.1990; Gyeongbuk Prov.: 1 ♀, Daegu-si, Buk-gu, Baekan-dong, 4.VI.1985; 13 ♂♂ 12 ♀♀, Gumi-si, Haepyeong-myeon, Songgok-ri, Dori-temple, 5.VIII.1994, SH Lee; 1 ♀, Gumi-si, Okgye-dong, 18.VI.1990, SH Lee; 1 ♂, Gunwi-gun, Hyoryeong-myeon, Gogok-ri, 6.VI.2010, SH Lee, pond; 4 ♂♂ 6 ♀♀, Gyeongju-si, Geoncheon-eub, Sinpyeong-ri, 28.V.1993, SH Lee; 1 ♀, Gyeo ngju-si, Jinhyeon-dong, Bulguk-temple, 23.VI.1991, SH Lee; 6 ♂♂ 6 ♀♀, Gyeongju-si, Naenam-myeon, Yongjang-ri, Hawgok-pond, 25.IV.1994, SH Lee, pond; 1 ♀, Kimcheon-si, Buhang-myeon, Daeya-ri, 29.VIII.2011, DH Lee, SW Jung, mountain stream; 36 ♂ 38 ♀♀, Pohang-si, Buk-gu, Jukjang-myeon, Duma-ri, 1.X.1989, SH Lee; 1 ♂ 2 ♀♀, Pohang-si, Gigye-myeon, Hwabong-ri, 5.IV.1993, SH Lee, pond; 1♂1♀, Sangju-si, Jungdong-myeon, Osang-ri, 18.VI.1990, SH Lee, pond; 1 ♂ 3 ♀♀, Uljin-gun, Seo-myeon, Wangpi-ri, 23.IV.1994, SH Lee, stream; 1 ♂, Ulsan-si, Ulju-gun, Samnam-myeon, Gacheon-ri 30.VI.2003, YB Cho, MJ Jeon, DH Lee, mountain stream (1 ♂, on slide); 8 ♂♂ 8 ♀♀, Yeongdeok-gun, Yeonghae-myeon, Myogok-ri, 6.VI.1994, SH Lee, pond; Gyeonggi Prov.: 1 ♂ 1 ♀, Anseong-si, 10.IX.1977, DW Oh; 1 ♀, Pocheon-si, Byeolnae-myeon, Yongam-ri, Mt. Yongamsan [= Sori-bong], 16.VII.1992, SH Lee; 1 ♀, Seoul-si, Gangbuk-gu, Ui-dong, Sogui-stream, 23.VI.2007, JG Lee, valley; 1 ♂, Yongin-si, Suji-gu, Sinbong-dong, 19.VII.1988, JH Lee; Gyeongnam Prov.: 1 ♂, Busan-si, Seo-gu, Ulmang-dong, 26.IV.2009, SH Lee; 1 ♂, Goseong-gun, Gaecheon-myeon, Bukpyeong-ri, 13.VIII.1995, SH Lee; 2 ♀♀, Euiryeong-gun, Yongdeok-myeon, Imok-ri, Deokam-pond, 18.V.2009, SH Lee, pond; 2 ♂♂ 5 ♀♀, Geoje-si, Geoje-myeon, Seosang-ri, Geoje-reservoir, 28.VII.2009, SH Lee, reservoir; 2 ♂♂, Habcheon-gun, Samga-myeon, Eojeon-ri, 8.V.2009, SH Lee, pond; 1 ♀, Hamyang-gun, Aneui-myeon, Sangwon-ri, Yongchu-temple, 16.VII.1985; 5 ♂♂ 2 ♀♀, Sacheon-si, Gonmyeong-myeon, Yongsan-ri, Dasol-temple, 14.VIII.1995, SH Lee; 1 ♂ 2 ♀♀, Sacheon-si, Sanan-myeon, 13.VIII.1995, SH Lee; 1 ♂, Sancheong-gun, Sancheong-eub, Jeonggok-ri, Jipum-church, 8.V.2009, SH Lee; Jeju Prov.: 1 ♂, Bukjeju-gun, Jocheon-eub, Gyorae-ri, 18.VIII.1992; 4 ♂♂ 3 ♀♀, Jeju-si, Ara-dong, Gwaneum-temple, 22.VII.1990, SH Lee (1 ♂, on slide); 1 ♂, Jeju-si, Hangyeong-myeon, Yongsu-ri, 17.VII.1992, SH Lee; Jeonbuk Prov.: 20 ♂♂ 27 ♀♀, Jeongeub-si, Naejang-dong, Mt. Naejangsan, 4.VIII.1990, SH Lee; 2 ♂♂ 2 ♀♀, Namwon-si, Sandong-myeon, Daesang-ri, Guijeong-temple, 28.VII.2008, DH Lee, pond; 6 ♂♂ 6 ♀♀, Namwon-si, Sannnae-myeon, Ibseok-ri, Silsang-temple, 12.VI.2008, DH Lee, pond (1 ♂, on slide); 1 ♀, Namwon-si, Unbong-eub, Maeyo-ri, 9.V.2009, SH Lee; Jeonnam Prov.: 2 ♂♂ 1♀, Haenam-gun, Songji-myeon, Geumgang-ri, 27.VII.2010, SH Lee, pond; 1 ♂, Gurye-gun, Gurye-eub, Sinseong-ri, Si-dong, 18.VI.2003, CH Park; 1 ♂, Janseong-gun, Bukha-myeon, Sinseong-ri, Mt. Naejangsan, 2.IV.2010, JC Jeong (1 ♂, on slide).

Published Korean records.

Gyrinus japonicus : Kolbe (1886: 179); Takizawa (1931: 18); Kamiya (1936: 20); Mochizuki and Tsunekawa (1937: 78) Mochizuki and Matsui (1939: 55); Ishii (1940: 43); Cho (1957: 201); Cho (1969: 191); Kim and Nam (1982: 25); Lee et al. (1985: 402); Yoon (1988: 616); Kim and Lee (1991: 65); Lee et al. (1992; 52); Lee (1994: 15); Lee (1995: 13); Mazzoldi (1995: 158); Nilsson et al. (2001: 29); Hua (2002: 41); Mazzoldi (2003: 27). Gyrinus japonicus franki (synonym): Kwon and Suh (1986: 98); Kim et al. (1994: 134); Kim (1995: 132); Han et al. (2007: 271); Han et al. (2008: 259); Cho and Park (2010: 95).

Diagnosis.

Length 6.5-8.5 mm. Ventral surface mostly black; mouthparts, prosternum, legs, sternite VIII brown to reddish brown; hypomera, epipleura dark brown. Ligula with a row of compact spines on antero-medial part. Anterior margin of mesoventrite acute and posterior margin bifid; shallow pit (arrow in Fig. 26) and vertical plica present on postero-medial part; shallow plica present on antero-lateral parts. Metepisternum with a pit (arrow in Fig. 27) and shallow groove on anterior part. Sternite II with small pit and transverse plica on anterior part (arrow in Fig. 28). Median lobe of aedeagus (Figs 47-49) parallel-sided at middle to apex, shorter than paramere, narrowest at middle; apical margin nearly straight; sperm-groove as in Fig. 48. Paramere as in Figs 47 and 49.

Distribution.

Korea, China (Northeast Territory), Japan, Russia (Far East) ( Mazzoldi 2003).

Habitat.

Specimens were collected in ponds with plentiful vegetation and low water temperature. In summer, we often found that a large number of individuals gathered whirling on surface of water.