Eotrechus brevipes Andersen, 1982

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 brevipes Andersen, 1982

Fig. 24

Eotrechus brevipes Andersen, 1982: 17-19, figs 13, 19, 25-27, 32-33 (type locality: Goom, Darjeeling, India).

Eotrechus brevipes : Andersen (1998: 4-5) (descriptive notes); Chen and Andersen (1993: 70) (checklist China); Thirumalai (2002: 59) (checklist India); Polhemus et al. (2009: 30-32, figs 1-3) (diagnosis, record Vietnam).

Material examined.

Paratypes: India • 1 ♀ (apterous); "N. India: Darjeeling , 7000ft., 11-20.iii.1924, Maj. R.W.G. Hingston / Everest Exp. Brit. Mus. 1924-386"; BMNH • 1 ♀ (macropterous); "Gopaldhara, Darjeeling, 4720 [not 4729 as in Andersen, 1982]- 6100 ft., on wet ground, 24-7-17, H. Stevens, Brit. Mus. 1922-307"; BMNH .

Other material.

India • 1 ♀ (apterous); NW Bengal, Rimbik-Srikhola; 2650 m a.s.l.; 15-27 May 2006; E. Kučera leg.; NHMW .

Nepal • 1 ♀ (apterous); Seti /D: Bajhang #34, 24 km NE Chainpur, vic. Dhalum ; 29°42.083'N, 81°22.067'E; 2400-2600 m a.s.l.; 26 Jun. 2009; J. Küßner leg.; NME .

Diagnosis.

Size: apterous males, length 7.2-7.8, width 2.2-2.6; macropterous males, length 8.7-8.9, width 2.3; apterous females, length 6.8-7.8, width 2.5-2.6; macropterous females, length 8.9, width 2.6 (with additional data from Andersen, 1982, 1998). Dorsum mainly brown, covered with green, reflective pubescence. Mesosternum 3.2-3.5 × length of metasternum. Male: fore femur incrassate at basal part, gradually tapering towards apex, without stiff setae on flexor side; sternum VII distinctly longer than two preceding sterna combined, posterior margin slightly emarginated. Male genitalia: pygophore with two broad and flattened posterolateral projections, each projection with a small, finger-like process at apex; proctiger simple, with narrow apex. Female: fore femur more slender than in male; abdomen about half of body length; sternum VII large, ca. 1.3 × length of two preceding sterna combined; genitalia concealed in abdomen by sternum VII and tergum VIII.

Remarks.

Eotrechus brevipes appears to be related to the E. vietnamensis species group in having broad posterolateral projections of the male pygophore. However, the set of characteristics, as in the diagnosis above, distinguishes it from the E. vietnamensis species group, which thus supports it in a species group of its own. In addition, the finger-like process on posterolateral projections of the male pygophore in E. brevipes is unique within Eotrechus .

Distribution.

India: Arunachal Pradesh, Sikkim, and West Bengal; Nepal (new record); China: Fujian ( Andersen 1982; Chen and Andersen 1993; Thirumalai 2002); Vietnam: Lao Cai ( Polhemus et al. 2009) (Fig. 24 ).

Eotrechus vietnamensis species group

Diagnosis. Dorsum brown with extensive yellowish markings. Male: fore femur moderately incrassate and constricted before apex; posterior margin of metasternum with a median fringe of short, black setae; abdominal venter with a median patch of long, yellow setae on sterna II-VI; posterior margin of sternum VII deeply notched, about half the length of sternum VII length; pygophore with a pair of broad, posterolateral projections, each directed obliquely dorsad; proctiger simple, with round apex. Female: sternum VII distinctly longer than two preceding sterna combined; genitalia visible in lateral view.

Species included. E. vietnamensis Tran & Yang, 2006 and E. pumat J. Polhemus, Tran & D. Polhemus, 2009.

Figures

Figure 24. Distribution records of species of Eotrechus. Squares represent E. brevipes species group; circles represent E. hygropetricus species group.