Metrocoris quynhi Tran & Zettel, 2005

A. D., Tran & Polhemus, D. A., 2017, The genus Metrocoris Mayr, 1865 (Gerromorpha: Gerridae) in Vietnam, with descriptions of five new species, Raffles Bulletin of Zoology 65, pp. 109-149 : 122-123

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 ).

Figures

Figs. 3–17. Dorsal colour patterns of Metrocoris species, all apterous morph. 3, 4: M. stranguloides, specimens from Vietnam, Gia Lai Prov., 60 km N. of An Khe (CL 4309). 5, 6: M. bilobatoides, specimens from Vietnam, Lao Cai Prov., 12 km NW. of Sa Pa (CL 4404). 7, 8: M. johnpolhemi, new species, specimens from Vietnam, Lai Chau Prov.; male from 12 km N. of Lai Chau (CL 4410), female from Nam Ceung stream (CL 4409). 9: M. vietnamensis, paratype, from Vietnam, Da Nang Prov., Ba Na - Nui Chua (TAD0334) (9 reproduced and modified from Tran & Zettel, 2005). 10, 11: M. quynhi, specimens from Vietnam, Lao Cai Prov., 18 km NW. of Sa Pa (CL 4400). 12, 13: M. obscurus, specimens from Vietnam, Lao Cai Prov., 4 km NE. of Sa Pa (CL 4407). 14, 15: M. acutus, specimens from Vietnam, Hai Hung Prov., 22 km N. of Chi Linh (CL 4375). 16, 17: M. nigrofascioides, specimens from Vietnam, Binh Dinh Prov., An Khe Pass (CL 4291).

Figs. 32–43. Parameres of Metrocoris species. 32: M. stranguloides, specimen from Vietnam, Gia Lai Prov., 60 km N. of An Khe (CL 4309). 33: M. bilobatoides, specimen from Vietnam, Lao Cai Prov., 12 km NW. of Sa Pa (CL 4404). 34: M. johnpolhemi, new species, specimen from Vietnam, Lai Chau Prov., Nam Ceung stream (CL 4409). 35: M. quynhi, specimen from Vietnam, Lao Cai Prov., 18 km NW. of Sa Pa (CL 4400). 36: M. obscurus, specimen from Vietnam, Lao Cai Prov., 4 km NE. of Sa Pa (CL 4407). 37: M. acutus, specimen from Vietnam, Hai Hung Prov., 22 km N. of Chi Linh (CL 4375). 38: M. nigrofascioides, specimen from Vietnam, Binh Dinh Prov., An Khe Pass (CL 4291). 39: M. sicilis, new species, specimen from Vietnam, Hanoi, Ba Vi N’Park (CL 4393). 40: M. triangulatus, specimen from Vietnam, Gia Lai Prov., N. of Tram Lap (ROM-961066). 41: M. ciliatus, paratype, from Vietnam, Lai Chau Prov., Muong Te (TAD1329). 42: M. nigriventris, new species, paratype, from Vietnam, Lao Cai Prov., 20 km NE. of Sa Pa (CL 4406). 43: M. monticola, new species, paratype, from Vietnam, Lao Cai Prov., Sa Pa, Sin Chai (TAD1363).

Figs. 66–73. Morphological features of Metrocoris species. 66–70: M. quynhi (65–70 reproduced from Tran & Zettel, 2005). 66: right fore leg of male. 67: pygophore, lateral view. 68: male genital capsule, dorsal view. 69: left paramere. 70: female sternum 7, in situ. 71–73: M. obscurus. 71: right fore leg of male. 72: left paramere. 73: sternum 7 of female, ventral view (66, 71 same scale; 67, 68 same scale; 69, 72 same scale; 70, 73 same scale).

Figs. 18–31. Dorsal colour patterns of Metrocoris species. 18, 19: M. inthanon, specimens from Vietnam, Nghe An Prov., Pu Mat Nature Reserve (CL 4385). 20, 21: M. sicilis, new species, paratypes, from Vietnam, Hanoi, Ba Vi N’Park (CL 4393). 22, 23: M. triangulatus, specimens from Vietnam, Kontum Prov., 60 km NW. of Kontum (CL 4280). 24, 25: M. nigriventris, new species, paratypes, from Vietnam, Lai Chau Prov., 12 km N. of Lai Chau (CL 4410). 26, 27: M. monticola, new species, paratypes, from Vietnam, Lao Cai Prov., Sa Pa, Sin Chai (TAD1363). 28, 29: M. sapa, new species, paratypes, from Vietnam, Lao Cai Prov., Sa Pa, Nui Xe (TAD0416). 30, 31: M. tenuicornis, specimens from Vietnam, Gia Lai Prov., 60 km N. of An Khe (CL 4309).

Fig. 139. Distribution records in Vietnam of Metrocoris obscurus, M. quynhi, M. acutus, and M. nigrofascioides.