Metrocoris quynhi Tran & Zettel 2005
Creators: name: A. D., Tran
name: Polhemus, D. A.
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Gerridae
Metrocoris
Metrocoris quynhi

description: Metrocoris quynhi Tran & Zettel, 2005
(Figs. 10, 11, 35, 66–70)
Metrocoris quynhi Tran & Zettel, 2005: 45–48, Figs. 10–17, 25, 28, 29 (type locality: Sa Pa, Lao Cai, Vietnam).
Material examined. Holotype and paratypes: see Tran & Zettel (2005).
Others – VIETNAM: Lao Cai Prov.: 1 female (apt), Sa Pa, Hoang Lien N’Park, Nui Xe, upstream of Suoi Vang, coll. Tran A.D., 4 July 2004, TAD0416 (ZRC); 5 males, 25 females (apt), 4 males, 6 females (mpt), Sa Pa, Hoang Lien N’Park, Nui Xe, Suoi Vang, coll. Tran A.D., 4 July 2004, TAD0417 (ZRC); 2 males, 1 female (apt), 1 immature, crest of pass N. of Mt. Fan Si Pan, 18 km NW. of Sa Pa on Lai Chau road, 1980 m asl, 22°21′10″N, 103°45′57″E, water temp. 16°C, 8 April 2000, 09:00–11:00 hrs., CL 4400, coll. D.A. Polhemus, J.T. Polhemus & P. Nguyen (USNM); 2 males, 5 females (apt), Sa Pa, Nui Xe, Tram Ton area, small feeder of Vang stream, near waterfall, coll. Dinh N.H. et al., 23 April 2011, DNH11.05 (ZMHU); 1 male, 1 female (apt), Sa Pa, Nui Xe, Tram Ton area, Vang stream, coll. Dinh N.H. et al., 23 April 2011, DNH11.06 (ZMHU); 2 males, 6 females (apt), Sa Pa, Nui Xe, Tram Ton area, feeder stream of Vang stream, coll. Dinh N.H. et al., 23 April 2011, DNH11.07 (ZMHU); 3 males, 1 female (apt), Sa Pa, Nui Xe, Tram Ton area, northward feeder stream of Vang stream, coll. Dinh N.H. et al., 23 April 2011, DNH11.09 (ZMHU); 1 female (apt), Sa Pa, Trung Chai, km 119 Nat. Road #4D, Mong Sen stream, coll. Dinh N.H. et al., 25 April 2011, DNH11.15 (ZMHU); 1 male (apt), Sa Pa, Nam Cang, Nam Cang stream, coll. Dinh N.H. et al., 23 October 2012, DNH12.08 (ZMHU); 5 males, 2 females (apt), 6 males, 5 females (mpt), Sa Pa, Nui Xe, Tram Ton area, Vang stream and its feeders, coll. Tran A.D., 30 May 2013, TAD1319 (ZMHU); 3 males, 3 females (apt), Sa Pa, Nui Xe, Tram Ton area, Vang stream, coll. Tran A.D. et al., 25 October 2013, TAD1356 (ZMHU); 12 males, 17 females (apt), Sa Pa, Nui Xe, Tram Ton area, feeder stream of Vang stream, coll. Tran A.D. et al., 25 October 2013, TAD1357 (ZMHU); 5 males, 5 females (apt), Sa Pa, stream from waterfall by roadside from Nui Xe to Sa Pa town, ca. 13 km from Sa Pa, coll. Tran A.D. et al., 25 October 2013, TAD1358 (ZMHU). Lai Chau Prov.: 1 male, 1 female (apt), Tam Duong, stream at San Xa Ho bridge, km 85 Nat. Road #4D, coll. Tran A.D., 31 May 2013, TAD1323 (ZMHU).
Diagnosis. Male: fore femur incrassate (ratio length/width 3.22–3.67), distal one-third constricted, but without distinct ventral indentation, with bipartite apical tooth, of which the distal part is the elevated rim of the ventral surface; inner face of fore tibia with subbasal tooth-like elevation (Fig. 66). Male genitalia: abdominal segment 8 large (see Tran & Zettel, 2005: Fig. 11); pygophore, on dorsal view, prolonged and subapically constricted, with apical margin straight, and with straight, slender dorsolateral process (Figs. 67, 68); proctiger long, with narrow distal part (Fig. 68); paramere hook-shaped, apically pointed (Figs. 35, 69); endosoma: dorsal sclerite long and recurved proximally, apical accessory sclerite indistinct, lateral sclerite straight, ventral sclerite long (see Tran & Zettel, 2005: Figs. 15, 16). Abdomen of female: sternum 7 (Fig. 70) with large medial lobe; lateral parts with longitudinal ridge from anterior end of incision to hind margin, and with small, mediad directed, wing-shaped lobes covering most-lateral parts of medial lobe; medial lobe subtrapezoidal, with distinctly notched hind margin, slanted dorsocaudad; on dorsal view, tergum 7 small, hidden under tergum 6.
Size: apterous males: length 6.3–7.0 (holotype 6.6), width 3.03–3.25 (holotype 3.10), macropterous males: length 6.4–6.5, width 3.00–3.30; apterous females: length 5.4–5.8 (allotype 5.45), width 3.30–3.40 (allotype 3.40), macropterous females: length 5.0–5.5, width 3.01–3.30.
Remarks. Metrocoris quynhi belongs to the M. anderseni species group (sensu Chen & Nieser, 1993) and is the first species of this group found in Vietnam. The morphological characteristics of the M. anderseni group and a detailed comparison of Metrocoris quynhi to other members of this group has already been provided by Tran & Zettel (2005: 44–45).
Distribution. Vietnam: Lao Cai, Lai Chau (first record) (Fig. 139).
description: Published as part of A. D., Tran & Polhemus, D. A., 2017, The genus Metrocoris Mayr, 1865 (Gerromorpha: Gerridae) in Vietnam, with descriptions of five new species, pp. 109-149 in Raffles Bulletin of Zoology 65 on pages 122-123, DOI: 10.5281/zenodo.4502634