Eotrechus vietnamensis Tran & Yang, 2006

Polhemus, John T., Tran, A. D. & Polhemus, Dan A., 2009, The Genus Eotrechus (Heteroptera: Gerridae) In Vietnam With Descriptions Of Two New Species, Raffles Bulletin of Zoology 57 (1), pp. 29-37 : 37

Eotrechus vietnamensis Tran & Yang, 2006

Eotrechus vietnamensis Tran & Yang, 2006: 11–20 , Figs. 1–6 , 26 (type locality: Tam Dao , Vinh Phuc, Vietnam).

Material examined. – VIETNAM, Vinh Phuc Prov.: 1 apterous male, 1 apterous female, Tam Dao National Park, Suoi Thac Bac (near Doi Che), coll. A.D. Tran & Q.K. Hoang, 17 Jun.2003, TAD0351 (holotype and allotype, ZMHU). For paratypes, see Tran & Yang (2006) .

Diagnosis. – Dorsal body with yellow markings on brown background (see Tran & Yang, 2006: fig. 26). Antennae longer than body length, first antennal segment longer than width of head across eyes. Abdomen relatively short in both sexes. Male sternites II–VI with patch of long hairs on median line, sternum VII with a deep rectangular median notch. Male genital segments large, pygophore broadly suboval, with a pair of disto-lateral projections, each directed obliquely upwards, plate like, and with slightly pointed apex in lateral view.

Remarks. – See remarks for E. pumat .

Distribution. – Northern Vietnam: Vinh Phuc, Ba Vi, Lai

Chau, Dien Bien, and Lao Cai provinces (Tran & Yang, 2006) .

Habitats. – This species occurs on wet bedrock faces and rheocrenes; see discussion in Tran & Yang (2006).

Figures

Figs. 1–3. Type locality for E. fansipan, new species, at a waterfall 17 km. northwest of Sa Pa, Vietnam. Both E. brevipes and E. fansipan, new species, occurred at this location. 1, general view of waterfall and surroundings, showing wet rheocrenes adjacent to the fall itself, on the left side of the photo, which provided habitat for E. fansipan, new species, and dry slopes to the right side of the photo, which provided habitat for E. brevipes. The senior author, standing to the right of the fall, provides scale; 2, lateral view of fall, showing dry bedrock faces in the foreground on which E. brevipes occurred; the photo was taken from near the position of the senior author in Fig. 1; 3, detail of E. brevipes habitat, showing clumps of vegetation scattered on open bedrock. Individuals of E. brevipes sheltered within the vegetation clumps.

Figs. 4–10. Eotrechus fansipan, new species, structural details: 4, male foreleg; 5, female abdomen, left lateral view; 6, male proctiger, left lateral view; 7, male proctiger, dorsal view; 8, male terminal abdomen, ventral view; 9, male pygophore, left lateral view; 10, male pygophore, dorsal view.