Metrocoris stranguloides Chen & Nieser, 1993

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 : 112-116

publication ID

https://doi.org/10.5281/zenodo.4502634

publication LSID

lsid:zoobank.org:pub:E9197A2F-EE46-4E5E-93C5-37E4CEC1A240

DOI

https://doi.org/10.5281/zenodo.4776461

persistent identifier

https://treatment.plazi.org/id/03E887F5-3765-3F02-FCF1-FC3993763101

treatment provided by

Carolina

scientific name

Metrocoris stranguloides Chen & Nieser, 1993
status

 

Metrocoris stranguloides Chen & Nieser, 1993

( Figs. 3, 4 View Figs , 32 View Figs , 44–46 View Figs )

Metrocoris stranguloides Chen & Nieser, 1993: 16–18 , Figs, 29, 38, 44–45 (type locality: Hainan Island, China); Zettel & Chen, 1996: 152, 176 (faunistic notes).

Material examined. VIETNAM: Quang Binh Prov.: 1 female (apt) , 1 male (mpt), Phong Nha, upstream of Thac Xoi waterfall, coll. Tran A.D., 15 July 2004, DY0407 ( ZRC) . Da Nang Prov.: 6 males, 3 females (apt) , 1 male, 3 females (mpt), Ba Na - Nui Chua, Suoi Cat Lon , 700 m asl, coll. Tran A.D. & Tan H.H., 28 February 2005, THH05-19 ( ZRC) ; 1 male, 1 female (apt), Ba Na - Nui Chua , rocky cascade along road to summit, coll. Tran A.D. & Tan H.H., 28 February 2005, THH05-20 ( ZRC) ; 1 male, 1 female (mpt), Ba Na-Nui Chua, Suoi Nai - Thac Cau Vong , coll. Tran A.D. & Tan H.H., 01 March 2005, THH05-23 ( ZRC) ; 2 males, 1 female (apt), 3 males (mpt), Ba Na - Nui Chua foothills, Suoi Lanh , coll. Tran A.D. & Tan H.H., 01 March 2005, THH05-25 ( ZMHU) . Quang Ngai Prov.: 18 males, 27 females (apt) , 4 males, 1 female (mpt), rocky stream crossing road on E. side of Via Lac Pass, 109 km NE. of Kontum on Hwy. 24, 305 m asl, 14°46′27″N, 108°32′18″E, water temp. 26.5°C, 17 March 2001, CL 4297, coll. D.A. Polhemus, J.T. Polhemus & P. Nguyen ( USNM, BPBM) GoogleMaps . Kon Tum Prov.: 2 males, 5 females (apt.), stream 77 km NE. of Kontum on Hwy. 24, 1195 m asl, 14°38′23″N, 108°23′38″E, water temp. 19°C, 6 March 2001, CL 4283, coll. J.T. Polhemus and P. Nguyen ( USNM) GoogleMaps ; 3 males, 6 females (apt), 3 females (mpt), small stream 97 km NE. of Kontum on Hwy. 24, 1065 m asl, 14°42′28″N, 108°27′46″E, water temp. 21°C, 20 March 2001, CL 4303, coll. D.A. Polhemus, J.T. Polhemus & P. Nguyen ( USNM, BPBM) GoogleMaps ; 4 males, 12 females (apt), 1 male, 2 females (mpt), stream 96 km NE. of Kontum on Hwy. 24, 1020 m asl, 14°41′58″N, 108°27′33″E, water temp. 22°C, 20 March 2001, CL 4304, coll. D.A. Polhemus, J.T. Polhemus & P. Nguyen ( USNM, BPBM) GoogleMaps . Gia Lai Prov.: 12 males, 11 females (apt) , 2 males, 3 females (mpt), 40 km NW. An Khe, Buon Luoi , 14°10′N, 108°30′E, 620–750 m asl, coll. Pacholátko & Dembicky, 28 March–12 April 1995 ( NHMW, 5 males, 5 females in ZRC) GoogleMaps ; 12 males, 16 females (apt), 1 female (mpt), Tral Stream, 60 km N. of An Khe , 700 m asl, 14°20′28″N, 108°34′49″E, water temp. 23.5°C, 22 March 2001, CL 4309, coll. D.A. Polhemus, J.T. Polhemus & P. Nguyen ( USNM, BPBM) GoogleMaps ; 4 males, 7 females (apt), 1 male, 1 female (mpt), small hill stream in primary forest, 68 km N. of An Khe , 840 m asl, 14°20′52″N, 108°32′57″E, water temp. 21°C, 22 March 2001, CL 4311, coll. D.A. Polhemus, J.T. Polhemus & P. Nguyen ( USNM, BPBM) GoogleMaps ; 1 female, 1 male (apt), Nuoc Stream, 47 km N. of An Khe , 580 m asl, 14°14′17″N, 108°36′17″E, water temp. 24°C, 23 March 2001, CL 4312, coll. D.A. Polhemus, J.T. Polhemus & P. Nguyen ( USNM, BPBM) GoogleMaps . Binh Dinh Prov.: 9 males, 4 females (apt), stream in boulders on E. side of An Khe Pass, 16 km E. of An Khe on Hwy. 19, 365 m asl, 13°57′43″N, 108°45′48″E, water temp. 19.5°C, 21 March 2001, CL 4307, coll. D.A. Polhemus, J.T. Polhemus & P. Nguyen ( USNM, BPBM) GoogleMaps . Phu Yen Prov.: 1 male, 5 females (apt), seeps and streamlets on S. side of Ca Pass, 33 km S. of Tuy Hoa on Hwy. 1, 105 m asl, 12°51′47″N, 109°23′53″E, water temp. 25°C, 25 March 2001, CL 4315, coll. D.A. Polhemus, J.T. Polhemus & P. Nguyen ( USNM, BPBM) GoogleMaps . Lam Dong Prov.: 19 males, 10 females (apt), Suoi Vang, 18 km NW. of Da Lat, coll. Vásárhelyi, 17 October 1988, No. 308 ( MTMB, NHMW) ; 69 males, 115 females (apt), 7 males, 13 females (mpt), 12 km N Dalat-LangBian, coll. P. Pacholátko & L. Dembicky, 28–30 April 1994 ( NHMW, ZRC) ; 5 males, 3 females (apt), 2 females (mpt), 12 km N Dalat-Langbian , 12°03′N 108°27′E, 1680–1750 m asl, coll. Pacholátko & Dembicky, 17–21 April 1995 ( NHMW, 4 males, 4 females in ZRC) GoogleMaps ; 1 male, 3 females (apt), 1 female (mpt), 16 km N Da Lat-Ankreot , 12°05′N, 108°24′E, 1400 m asl, coll. Pacholátko & Dembicky, 15 April 1995 ( NHMW) GoogleMaps ; 5 females (apt), Duc Me, 15 km S. of Bao Loc , 700 m asl, coll. Vásárhelyi, 23 October 1988, No. 371 ( MTMB) ; 1 male, 1 female (apt), Suoi Baco, 12 km S. of Bao Loc , 800 m asl, coll. Vásárhelyi, 25 October 1988, No. 386 ( MTMB) ; 1 male, 1 female (apt), 1 male, 4 females (mpt), Da Lat, a stream running into Dankia lake , coll. Tran A.D., 21 May 2003, TAD0330 ( ZRC) ; 4 males, 3 females (apt), 1 female (mpt), Da Lat, Datanla waterfall, coll. Tran A.D., 22 May 2003, TAD0333a ( ZRC) ; 3 males, 3 females (apt), 1 female (mpt), Dambri Waterfall, N. of Bao Lac , 850 m asl, 11°38′14″N, 107°44′54″E, water temp. 24°C, 7 May 1998, CL 3075, coll. J.T. Polhemus & P. Nguyen ( USNM, BPBM) GoogleMaps ; 7 males, 12 females (apt), small steeply dropping stream at Mother Mary Shrine, along Hwy. 20 on S. side of Bao Lac Pass , 18 km W. of Bao Lac , 800 m asl, 11°27′09″N, 107°43′21″E, water temp. 24.5°C, 7 May 1998, CL 3076, coll. J.T. Polhemus & P. Nguyen ( DAPC) GoogleMaps ; 3 males, 3 females (apt), stream below Suoi Vàng hydro project (= Gold Stream), 16 km N. of Dalat , 1430 m asl, 11°59′26″N, 108°22′06″E, water temp. 24.5°C, 9 May 1998, CL 3078, coll. J.T. Polhemus & P. Nguyen ( DAPC) GoogleMaps ; 10 males, 9 females (apt), 1 female (mpt), small tribs. to stream below Suoi Vàng hydro project (= Gold Stream), 16 km N. of Dalat , 1430 m asl, 11°59′26″N, 108°22′06″E, water temp. 19.5°C, 9 May 1998, CL 3079, coll. J.T. Polhemus & P. Nguyen ( DAPC) GoogleMaps ; 1 male (apt), spring fed trib. to stream below Suoi Vàng hydro project (= Gold Stream), 16 km N. of Dalat , 1430 m asl, 11°59′26″N, 108°22′06″E, 9 May 1998, CL 3080, coll. J.T. Polhemus & P. Nguyen ( DAPC) GoogleMaps ; 6 males, 8 females (apt), 2 males, 1 female (mpt), Prenn Falls, 13 km S. of Dalat on Hwy. 20, 1160 m asl, 11°52′43″N, 108°28′19″E, water temp. 25.5°C, 10 May 1998, CL 3083, coll. J.T. Polhemus & P. Nguyen ( DAPC) GoogleMaps ; 3 males, 1 female (apt), 4 males, 5 females (mpt), small rocky stream at Lang Biang Mtn., 12 km N. of Dalat , 1465 m asl, 12°01′12″N, 108°25′27″E, water temp. 20°C, 11 May 1998, CL 3084, coll. J.T. Polhemus & P. Nguyen ( USNM, BPBM) GoogleMaps ; 35 males, 27 females (apt), 3 males, 7 females (mpt), tributary stream to main river at Suoi Vang , 1430 m asl, 11°59′26″N, 108°22′06″E, water temp. 21°C, 11 and 18 May 1998, CL 3085, coll. J.T. Polhemus & P. Nguyen ( USNM, BPBM) GoogleMaps ; 3 females (apt), 2 males (mpt), stream and cascade 6 km S. of Dalat on Hwy. 20, 1390 m asl, 11°54′10″N, 108°26′46″E, 20 May 1998, CL 3095, coll. J.T. Polhemus & P. Nguyen ( DAPC) GoogleMaps ; 15 males, 24 females (apt), 4 males, 5 females (mpt), stream in pine forest 13 km N. of Dalat on Suoi Vang road, 1495 m asl, 11°59′26″N, 108°23′19″E, water temp. 21.5°C, 28 March 2001, CL 4317, D.A. Polhemus, J.T. Polhemus and P. Nguyen ( USNM, BPBM) GoogleMaps . Ninh Thuan Prov.: 1 male (apt), Nui Chua N’Park , suoi Lo O, coll. Quang N.V., 26 June 2004, NC-03 ( ZRC) ; 19 males, 40 females (apt), 2 males (mpt), first small stream on E. side of Belleview Pass (Ngoan Muc Pass), 66 km NW. of Phan Rang , pools and cascades, 915 m asl, 11°50′25″N, 108°39′21″E, water temp. 24°C, 12 May 1998 and 26 March 2001, CL 3087, coll. D.A. Polhemus, J.T. Polhemus & P. Nguyen ( DAPC, USNM, BPBM) GoogleMaps ; 3 males, 1 female (apt), 1 male (mpt), spring fed stream in granite at shrine on E. side of Belleview Pass (Ngoan Muc Pass), 58 km NW. of Phan Rang , 700 m asl, 11°50′41″N, 108°39′57″E, water temp. 724°C, 12 May 1998, CL 3089, coll. D.A. Polhemus, J.T. Polhemus & P. Nguyen ( DAPC) GoogleMaps .

CHINA: Hainan Prov.: 1 female (apt), Hainan (193), 30 km E. Maoyang, 600 m asl, Wuzhi Shan Resort, coll. Jäch, 17–18 January 1996 ( NHMW) ; 1 female (mpt), Wuzhishan, hill stream near Fanxiang, before Shuiman , coll. I-S. Chen et al., 9 September 2005, THH05-67 ( ZRC) ; 13 males, 7 females (apt), 1 female (mpt), Qiongzhong, Baihua waterfall, near Qiongzhong town , coll. I-S. Chen et al., 11 September 2005, THH05-73 ( ZRC) ; 1 male (apt), Qiongzhong, Linmushan forest park, ca. 15 km into track from road, coll. I-S. Chen et al., 11 September 2005, THH05-77 ( ZRC) ; 1 male, 4 females (apt), 1 female (mpt), Baisha, river along road near Yuanmen, to Wuzhishan , coll. I-S. Chen et al., 12 September 2005, THH05-82 ( ZRC) .

LAOS: Luang Nam Tha Prov.: 3 males, 1 female (apt) , 2 females (mpt), 20 km SE. Muang Sing, 950 m asl, coll. Schillhammer (25), 12 June 1996 ( NHMW) .

Diagnosis. Male: fore femur strongly incrassate with two sub-apical teeth and a median tooth ( Figs. 44, 45 View Figs ). Male genitalia large: pygophore sub-ovate (ventral view), slightly raised posteriorly (lateral view); proctiger elongate; paramere long and slender, curved at distal part, but not twisted ( Fig. 32 View Figs ); endosoma as in Chen & Nieser (1993: Figs. 44, 45 View Figs ). Female: sternum 7 with broad median lobe, posterior margin of median lobe almost straight ( Fig. 46 View Figs ).

Size: apterous males: length 5.5–6.5, width 2.81–3.23, macropterous males: length 7.2–8.3, width 2.71–3.14; apterous females: length 4.8–5.4, width 2.57–3.05, macropterous females: length 6.2–7.4, width 2.67–3.20.

Remarks. Metrocoris stranguloides is the only species of the M. strangulator group known from Vietnam. As defined by Chen & Nieser (1993), the following are characteristics of this group: strongly incrassate fore femur (males), with two sub-apical teeth and a median tooth; large male genitalia with prominent paramere; sternum 7 of female with broad medial lobe. This group contains five species: M. stragulator Breddin (from Java and Sumatra), M. armatus Chen & Nieser (from Thailand), M. malayensis Chen & Nieser (from Thailand and Peninsular Malaysia), M. nieseri Chen & Zettel (from Thailand), and M. stranguloides Chen & Nieser (initially described from Hainan Island and S. Vietnam). Metrocoris stranguloides can be easily distinguished from the other four species in this group by having a long and slender paramere, simply curved on the distal part but not twisted ( Chen & Nieser, 1993). Females of this species are also rather different from those of the other four taxa in having a straight hind margin of the median lobe on sternum 7 (females of the other four species have a clearly notched posterior margin on sternum 7).

Distribution. Vietnam: Quang Binh (first record), Da Nang (first record), Ninh Thuan (first record), Gia Lai, Lam Dong, Kon Tum (first record), Quang Ngai (first record) ( Fig. 138 View Fig ). Extralimital records: Hainan Island ( China), Laos (first record).

ZRC

Zoological Reference Collection, National University of Singapore

ZMHU

Zoologisches Museum der Humboldt Universitaet

USNM

Smithsonian Institution, National Museum of Natural History

BPBM

Bishop Museum

NHMW

Naturhistorisches Museum, Wien

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hemiptera

Family

Gerridae

Genus

Metrocoris

Loc

Metrocoris stranguloides Chen & Nieser, 1993

A. D., Tran & Polhemus, D. A. 2017
2017
Loc

Metrocoris stranguloides

Zettel H & Chen PP 1996: 152
Chen PP & Nieser N 1993: 18
1993