Eotrechus vietnamensis Tran & Yang, 2006

Tran, Anh Duc, Zettel, Herbert & Sites, Robert W., 2023, Revision of the genus Eotrechus Kirkaldy (Hemiptera, Heteroptera, Gerridae), with descriptions of six new species, Deutsche Entomologische Zeitschrift 70 (1), pp. 69-111 : 69

Eotrechus vietnamensis Tran & Yang, 2006

Figs 1A , 26

Eotrechus vietnamensis Tran & Yang, 2006: 12-14, figs 1-6, 26 (type locality: Tam Dao, Vinh Phuc, Vietnam).

Eotrechus vietnamensis : Polhemus et al. (2009: 37) (key, diagnosis); Tran et al. 2014: 26 (record Phu Tho, Vietnam).

Material examined.

Vietnam • 1 ♂ (apterous); Lao Cai Province, Sa Pa, Sin Chai, Sin Chai stream, site 1; 27 Oct. 2013; Tran A.D. et al. leg.; TAD1363; ZVNU • 1 ♀ (apterous); Lao Cai Province, Sa Pa, Sin Chai, Muong Hoa stream; 22 Apr. 2011; Dinh N.H. et al. leg.; DNH11.03; ZVNU • 11 ♂♂, 11 ♀♀ (apterous), 1 ♂ (macropterous); Ha Giang Province, Vi Xuyen, Xin Chai commune, Da stream by the road from Thanh Thuy to Lao Chai ; 09 May 2014; Tran A.D. et al. leg.; TAD1405; ZVNU • 3 ♂♂, 3 ♀♀ (apterous); Ha Giang Province, Hoang Su Phi, Nam Ty commune, bridge at km 34 road 177, waterfall & stream, ca. 65km to Coc Pai ; 10 May 2014; Tran A.D. et al. leg.; TAD1411; ZVNU • 2 ♂♂, 1 ♀ (apterous), 1 nymph; Ha Giang Province, Xin Man, Nam Dan commune, Thac Tien - Deo Gio , waterfall & stream; 11 May 2014; Tran A.D. et al. leg.; TAD1414; ZVNU • 2 ♂♂ (apterous); Cao Bang Province, Phia Oac - Phia Den National Park, connecting road from Road #212 to Road #34, upstream of fish farm; 28 Oct. 2020; Tran A.D. leg.; TAD20-27; ZVNU • 6 ♂♂, 9 ♀♀ (apterous), 3 nymphs; Cao Bang Province, Phia Oac - Phia Den National Park, km 3 Road #212, 25 km to Na Ban ; 30 Oct. 2020; Tran A.D. leg.; TAD20-30; ZVNU • 2 ♂♂ (apterous), 2 nymphs; Cao Bang Province, Phia Oac - Phia Den National Park, km 6 Road #212, 22 km to Na Ban ; 30 Oct. 2020; Tran A.D. et al. leg.; TAD20-32; ZVNU • 2 ♂♂, 2 ♀♀ (apterous), 4 nymphs; Phu Tho Province, Xuan Son National Park, Kim Thuong, Tan Ong stream, site 1, at Chin Tang waterfall; 6 Jun. 2013; Tran A.D. et al. leg.; TAD1334; ZVNU • 3 ♂♂, 2 ♀♀ (apterous); Hanoi, Ba Vi National Park , small creek by main road to summit, ca. 9.5km from park head quarter; ca. 600 m asl.; 11 Jun. 2010; Tran A.D. leg.; TAD1014; ZVNU .

Diagnosis.

Size: apterous males, length 5.50-5.90 (holotype 5.90), width 1.85-2.07 (holotype 1.97); apterous females, length 6.30-7.00, width 2.22-2.39; macropterous females, length 7.20-7.80, width 2.20-2.44. Dorsum covered with silvery or greenish pubescence, background colour brown with yellowish markings. Mesosternum 4.4-5.3 × length of metasternum, posterior margin of metasternum with a median fringe of closely-set, black setae. Male: fore femur simple, distal part slightly constricted; abdominal venter with patch of long, yellow, soft setae on mediosternites II-VI; sternum VII more than twice as long as two preceding sterna combined; posterior margin of sternum VII with a deep, rectangular notch. Male genitalia: pygophore broadly suboval, with a pair of flat, posterolateral projections, projection with slightly triangular apex pointing laterad. Female: flexor side of fore femur with 4-5 stiff setae at basal part; sternum VII ca. 1.2 × length of two preceding sterna combined; genitalia visible in lateral view.

Distribution.

Vietnam (northern provinces): Vinh Phuc, Lai Chau, Dien Bien, Lao Cai, Phu Tho, Hanoi (Ba Vi) ( Tran and Yang 2006; Polhemus et al. 2009; Tran et al. 2014); Ha Giang, Cao Bang (new records) (Fig. 26 ).

Figures

Figure 1. In-situ photographs of Eotrechus. A. E. vietnamensis, apterous male, from Ha Giang Province, Vietnam; B. E. konkakinh sp. nov., apterous male, from Gia Lai Province, Vietnam.

Figure 26. Distribution records of species of Eotrechus. Circles represent E. longipes species group; squares represent E. petraeus species group; stars represent E. vietnamensis species group.