Dineutus (Spinosodineutes) orientalis (Modeer, 1776)

Lee, Dae-Hyun & Ahn, Kee-Jeong, 2015, A taxonomic review of the Gyrinidae (Coleoptera) in Korea, ZooKeys 509, pp. 87-107 : 89

Taxon classification Animalia Coleoptera Gyrinidae

Dineutus (Spinosodineutes) orientalis (Modeer, 1776) Figs 1, 7-14, 41-43, 59

Gyrinus orientalis Modeer, 1776: 160.

Dineutus marginatus Sharp, 1873: 56. Synonymized by Ochs (1926: 136).

Dineutus quadrispina Fairmaire, 1878: 88. Synonymized by Ahlwarth (1910: 6).

Dineutus (Spinosodineutes) orientalis : Ochs (1930: 9).

Specimens examined.

NORTH KOREA: Gangwon Prov.: 1 ♂ 1♀, Uonsan-city, Anbyon-gun, Pisan-ri, 23.VII.2008, Changdo Han. SOUTH KOREA: Gangwon Prov.: 2 ♂♂ 1 ♀, Cheorwon-gun, Dongsong-eub, Odeok-ri, Hakji-reservoir, 15.IX.1990; Gyeongbuk Prov.: 3 ♂♂ 3 ♀♀, Euiseong-gun, Geumseo-myeon, Sujeong-ri, 27.VII.2010, SW Jung, DH Lee, valley (1 ♂, on slide); 1 ♂ 1 ♀, Gumi-si, Okgye-dong, 18.VI.1990, SH Lee; 1 ♀, Gyeongju-si, Geoncheon-eub, Sinpyeong-ri, 28.V.1993, SH Lee; 1 ♂, Gyeongju-si, Wolseong-dong, 5.VI.1987, HM Lee; Gyeonggi Prov.: 1 ♂ 2 ♀♀, Hwaseong-si, Songsan-myeon, Dokji-ri, N37°15'25.08", E126°40'49.68", 5 m, 4.VII.2013, DH Lee, SG Lee, pond near brackish zone; 1 ♀, Incheon-si, Ganghwa-gun, Gyodong-myeon, 6.X.2009, HM Lim; 1 ♂, same data as former except for, Naega-myeon, 16.IX.1990, SH Lee, pond; 1 ♀, Suwon-si, 24.VI.1969; Jeju Prov.: 1 ♂, Bukjeju-gun, Jocheon-eub, Seonheul-ri, 11.VI.2005, DH Lee, pond; 1 ♂, Seoguipo-si, Daejeong-eub, Boseong-ri, 9.VII.1985; Jeonnam Prov.: 1 ♂, Haenam-gun, Hwangsan-myeon, Namri-ri, 13.VI.2010, SH Lee; 1 ♂, Hawsun-gun, Dong-myeon, Jangdong-ri, 3.VIII.2009, SH Lee.

Published Korean records.

Dineutus (Spinosodineutes) orientalis : Mazzoldi (1995: 160); Mazzoldi (2003: 26). Dineutus orientalis : Kamiya (1936: 16); Mochizuki and Tsunekawa (1937: 78); Mochizuki and Matsui (1939: 56); Kamiya (1940: 130); Cho (1957: 201); Cho (1963: 46); Cho (1969: 191); Kim and Nam (1982: 25); Lee et al. (1985: 402); Kwon and Suh (1986: 98); Yoon (1988: 617); Lee et al. (1992: 55); Kim et al. (1994: 14); Lee (1995: 15); Hua (2002: 41); Han et al. (2007: 271); Han et al. (2008: 261); Park et al. (2008 a: 248); Cho and Park (2010: 95). Dineutus marinatus : Okamoto (1924: 167); Takizawa (1931: 15); Yoshino (1935: 16); Kusanagi (1936: 323).

Diagnosis.

Length 9.0-10.0 mm. Dorsal surface mostly dark grey; clypeus, labrum, interorbital area metallic green; lateral parts of pronotum, margin of elytra yellow. Maxillary palpi shorter than labial palpi, palpomere 4 as long as 1-3 combined. Anterior margin of ligula slightly bisinuate; labial palpomere 3 as long as 1-2 combined. Gula with few setae on lateral margin. Postero-lateral and apical parts of elytron sharply pointed (arrows in Fig. 9). Antero-medial margin of prosternum (Fig. 10) strongly rounded. Prosternal process nearly parallel-sided (arrow in Fig. 10). Median lobe of aedeagus (Figs 41-43) shorter than paramere; apical part acute; sperm-groove as in Fig. 42. Paramere (Figs 41, 43) slightly curved at anterior fourth; apical margin rounded.

Distribution.

Korea, China (Fujian, Guangdong, Guizhou, Guangxi, Hebei, Jiangsu, Liaoning), Japan, Russia (Far East) ( Mazzoldi 2003).

Habitat.

Most Korean specimens are found in ponds or mountain streams with plentiful vegetation and low water temperature. Some specimens were collected in ponds near brackish water.