Ochthebius (Ochthebius) marinus (Paykull, 1798)

Lee, Dae-Hyun & Ahn, Kee-Jeong, 2016, A taxonomic review of the Hydraenidae in South Korea (Coleoptera), ZooKeys 634, pp. 57-78 : 67

Taxon classification Animalia Coleoptera Hydraenidae

Ochthebius (Ochthebius) marinus (Paykull, 1798) Figs 4, 34-41, 53, 56

Helophorus marinus Paykull, 1798: 245.

Ochthebius pallidus Mulsant, 1844: 61.

Ochthebius holmbergi Mannerheim, 1853: 166.

Ochthebius subabruptus Rey, 1885: 23.

Ochthebius (s. str.) marinus Jäch, 1992: 112; 2003: 330; Jäch and Skale 2015: 157.

Specimens examined.

SOUTH KOREA: Gyeonggi Prov.: 2♂♂ 3♀♀, Ansan-si, Danwon-gu, Daebudo-dong, Dongju-salt farm, N37°14'05.60" E126°36'19.55" 4 m, 7 XI 2013, DH Lee, IS Yoo, SG Lee, saline pond near salt farm (1♂, on slide).

Redescription.

Length 1.7-2.0 mm. Head metallic dark green; pronotum mostly pale yellowish brown and medial part brown; elytra pale yellow and rows of serial punctures dark brown; ventral surface mostly dark brown. Mentum (Fig. 34) as long as wide, widest anterior third and with sparse setae; antero-medial part broadly excised; antero-lateral part protruded. Anterior gena (Fig. 35) with long setae on posterior part in ventral view. Gula (Fig. 35) with spiny microreticulation. Antenna (Fig. 35) with nine antennomeres; 1 longest, approx. 6.0 times as long as 2, with two long setae on lateral part; 2 widest at base; 3 bulbous at apical part; 4 dish-shaped; 5-9 clubbed with pubescence. Maxillary palpomere (Fig. 36) 1 small, approx. 2.0 times as long as wide; 2 bulbous at apical part, 4.0 times as long as 1; 3 largest, bulbous at apical part, slightly longer than 2; 4 slender and paralleled, 0.5 times as long as 3. Pronotum (Fig. 37) reverse trapezoidal, widest at anterior third, with indistinct longitudinal groove on median part; anterior margin nearly straight; anterior corner rectangular; lateral margin protruded at anterior third; posterior corner obtuse; postero-medial part rounded. Elytra (Figs 38, 39) widest at middle, with setae. Mesoventrite (Fig. 40) pentagonal, with transverse thick carina on anterior part; antero-lateral part with two grooves. Metaventrite (Fig. 41) with pubescence on medial part. Sternite VIII with more or less long setae on posterior part. Male terminal sternite semicircular and with long setae on posterior margin. Median lobe of aedeagus (Fig. 53) slightly curved; apical part acute; distal lobe approx. 0.1 times as long as median lobe. Paramere (Fig. 53) shorter than median lobe; apical part oval with setae.

Distribution.

Asia: Korea, China (Beijing, Heilongjiang), Russia (East Siberia); Europe: Denmark, Estonia, Finland, France, Great Britain, Germany, Ireland, Latvia, The Netherlands, Norway, Poland, Russia, Spain, Sweden; North America.

Biological note.

The specimens were collected in saline pond (salinity 32.84‰) with algae and plentiful vegetation near salt farm. They were found with Hydroglyphus coreanus Lee & Ahn ( Dytiscidae ), Berosus lewisius Sharp, Berosus spinosus (Steven), Enochrus simulans (Sharp), and Paracymus aeneus (Germar) ( Hydrophilidae ).

Remarks.

This species is recorded for first time in Korea.