Ochthebius (Ochthebius) lobatus Pu, 1958

Lee, Dae-Hyun & Ahn, Kee-Jeong, 2016, A taxonomic review of the Hydraenidae in South Korea (Coleoptera), ZooKeys 634, pp. 57-78 : 65-66

Taxon classification Animalia Coleoptera Hydraenidae

Ochthebius (Ochthebius) lobatus Pu, 1958 Figs 3, 26-33, 52, 56

Ochthebius (s. str.) lobatus Pu, 1958: 256; Jäch 1995: 178; 2003: 351; Jäch and Skale 2015: 157.

Specimens examined.

SOUTH KOREA: Gangwon Prov.: 4♂♂ 2♀♀, Samcheok-si, Wondeok-eub, Wolcheon-ri, Gagok-steam, 1 V 1994, SH Lee, beside stream (4♂1♀, on slides); 5♂♂ 7♀♀, same data as former except for, 1 VI 1995; 1♀, same data as former except for, 25 VI 1995; Gyeongbuk Prov.: 2♂♂ 3♀♀, Uljin-gun, Namdae-stream, 17 VII 1995, SH Lee.

Published South Korean records.

Ochthebius lobatus : Jäch and Skale (2015: 157). Ochthebius inermis : Lee (1995: 13) [misidentification].

Redescription.

Length 2.2-2.6 mm. Head dark brown; pronotum and elytra brown to dark brown; ventral surface mostly brown. Dorsum (Figs 27, 30, 31) with whitish long setae. Mentum (Fig. 28) 1.2 times as wide as long and with sparse setae, widest anterior third; antero-lateral part protruded. Anterior gena without long setae on posterior part in ventral view. Antenna with nine antennomeres; 1 longest, approx. 6.0 times as long as 2, two long setae present on lateral part; 2 bulbous at medial part; 3 bulbous at apical part; 4 semicircular; 5-9 clubbed and with pubescence. Maxillary palpomere (Fig. 29) 1 small, approx. 2.0 times as long as wide; 2 bulbous at apical part, 3.5 times as long as 1; 3 bulbous at apical part, as long as 2; 4 slender and parallel-sided, 0.5 times as long as 3. Pronotum (Fig. 30) reverse trapezoidal, widest at anterior three seventh, with distinct longitudinal groove on medial part, two rounded grooves on anterior part, two oval grooves on posterior part; anterior margin bisinuate; antero-median margin straight; anterior corner rectangular; posterior corner obtuse; postero-medial part rounded. Elytra (Fig. 31) widest at middle, with long setae. Mesoventrite (Fig. 32) pentagonal with T-shaped carina on anterior part; anterior margin transverse. Metaventrite (Fig. 32) with pubescence on medial part. Sternite VIII (Fig. 33) with more or less long setae on posterior part. Male terminal sternite semicircular with few spines on posterior part. Median lobe of aedeagus (Fig. 52) weakly slender, curved; subapical part vented, inflated at anterior third; apical part acute with few setae; distal lobe cylindrical, approx. 0.25 times as long as median lobe. Paramere (Fig. 52) slender, shorter than median lobe, with few setae on apical part.

Distribution.

Korea, China (Chongqing, Jilin, Liaoning, Sichuan, Yunnan).

Remarks.

Lee (1995) first reported Ochthebius inermis Sharp in South Korea but we found that this was a misidentification of Ochthebius lobatus , based on our examination of his voucher specimens (4♂♂ 2♀♀, Samcheok-si, Wondeok-eub, Wolcheon-ri, Gagok-steam, 1 V 1994, SH Lee, ex. beside stream). This species can be distinguished from Ochthebius inermis by elytra brown and distal lobe of aedeagus robust.