Metrocoris guizhouensis, Chen, Zhen Ye Ping-Ping & Bu, Wen-Jun, 2016

Chen, Zhen Ye Ping-Ping & Bu, Wen-Jun, 2016, Notes on the Metrocoris lituratus group (Heteroptera: Gerridae: Metrocoris) with descriptions of four new species in Sichuan Basin from China, Zootaxa 4117 (3), pp. 359-374 : 371-372

publication ID	https://doi.org/ 10.11646/zootaxa.4117.3.4
publication LSID	lsid:zoobank.org:pub:441C768B-FE38-47D6-819F-BE19CC167DB7
DOI	https://doi.org/10.5281/zenodo.6063142
persistent identifier	https://treatment.plazi.org/id/43435E3D-7216-E27F-FF40-417CFD1EFE02
treatment provided by	Plazi
scientific name	Metrocoris guizhouensis
status	sp. nov.

Treatment

Metrocoris guizhouensis View in CoL sp. nov.

( Figs. 19 View FIGURES 13 – 20 , 27 View FIGURES 21 – 28 , 32 View FIGURES 29 – 33 , 37, 42, 47, 52, 57, 65, 70, 78–80, 84)

Material examined. Holotype: apterous male, CHINA, Guizhou Prov., Zunyi city, Suiyang county, Kuankuoshui Nature Reserve (28°14'N, 107°11'E), 8 August 2013, 1250 m, leg. Zhen Ye ( NKUM). Paratypes: 1 apterous male and 1 apterous female ( NCTN), 2 apterous males and 2 apterous females ( NKUM), same data as holotype.

Diagnosis. The relatively large body size (male body length 6.75–6.82; female body length: 6.35–6.40) ( Figs. 19 View FIGURES 13 – 20 , 27 View FIGURES 21 – 28 , 32 View FIGURES 29 – 33 ); fore femora only with a subapical indentation and a small single apical tooth ( Fig. 42 View FIGURES 39 – 43 ); unmodified inner surface of the fore tibiae ( Fig. 42 View FIGURES 39 – 43 ); male proctiger with a pair of blackish dots laterally ( Fig. 57 View FIGURES 44 – 58 ); the diagnostic shape of the paramere ( Figs. 65 View FIGURES 59 – 66 , 80 View FIGURES 72 – 83 ); and female abdominal sternum VII laterally constricted, with the apical half forming a broad lobe, and the caudal margin without median notch (Fig. 37), are the diagnostic features of M. guizhouensis sp. nov..

Description. Apterous male ( Figs. 19 View FIGURES 13 – 20 , 27 View FIGURES 21 – 28 ). Body length 6.75–6.82, body width (across acetabula) 2.90–3.00. Colour: dorsum yellow with prominent black stripes; interocular dark mark usually arrowhead-shaped, bifid posteriorly, along inner margin of eyes with narrowly indistinct dark line; first antennal segment yellowish brown, remaining segments usually blackish; rostrum yellowish with black apex; pronotum with T-shaped black stripe, lateral pronotal stripe very broad; mesonotum with median slender longitudinally stripe, sublateral stripes broader than lateral stripes, nearly equal in width to transverse bands; longitudinal dark stripe of mesopleuron slender, running at least 1/2 of its length, close to anterior margin but far from short acetabular mark; anterior transverse stripe of metanotum laterally confluent with posterior stripe of metanotum; fore femora with apical dark ring and four longitudinal marks, ventral mark connected with ring, remaining marks not confluent, inner mark pale and bright, external mark broad and blackish brown; middle and hind femora yellowish, tibiae and tarsi black; abdomen mainly blackish dorsally, abdominal tergites II–V blackish, abdominal tergites VI–VII blackish anteriorly and yellowish posteriorly; abdominal segment VIII with a large rectangular blackish mark in dorsal view, posteriorly with moderately bifid-shaped. Genital segments yellowish brown. Structural characters: head length 0.69–0.72, head width 1.66–1.69, minimum interocular width 0.65–0.68; antenna about 0.82 times as long as body, lengths of antennal segments I–IV: 2.57, 1.23, 1.13, 0.61; pronotum slightly narrower than head, pronotum length 0.67–0.70, pronotum width 1.75–1.78; fore femora slightly incrassate, ratio length/width 5.2, inner side not modified, with a subapical indentation, and a small single apical tooth ( Fig. 42 View FIGURES 39 – 43 ); inner surface of fore tibiae not modified ( Fig. 42 View FIGURES 39 – 43 ); lengths of leg segments (femur, tibia and tarsus): fore leg: 2.92, 2.78 and 1.11 (0.10+1.01), middle leg: 7.60, 5.76 and 2.98 (2.60+0.38), hind leg: 7.53, 5.25 and 0.83 (0.43+0.40); dorsum of abdomen clothed with short shiny golden hair, venter of abdomen densely clothed with pale yellow hairs. Male terminalia: abdominal segment VIII more or less rectangular ( Fig. 47 View FIGURES 44 – 58 ), length 1.61, width 1.01, about 1.59 times as long as wide, posterior margin with dense brown erect hairs ( Fig. 47 View FIGURES 44 – 58 ); pygophore subovate ( Fig. 52 View FIGURES 44 – 58 ), proctiger laterally with a pair of blackish dots ( Fig. 57 View FIGURES 44 – 58 ); paramere moderately stout and curved upwards, extending beyond genital segments, blade of paramere laterally with small protuberance, apex blunt ( Figs. 65 View FIGURES 59 – 66 , 80 View FIGURES 72 – 83 ). Endosoma ( Figs. 70 View FIGURES 67 – 71 , 78, 79 View FIGURES 72 – 83 ): dorsal sclerite long and recurved proximally, accessory lateral sclerites slender and straight, ventral sclerites present and long.

Apterous female ( Fig. 32 View FIGURES 29 – 33 ). Body length 6.35–6.40, body width (across acetabula) 3.26–3.30. Colour similar to apterous male. Structural characters: head length 0.78–0.81, head width 1.67–1.71, minimum interocular width 0.67–0.69; antenna about 0.79 times as long as body, lengths of antennal segments I–IV: 2.18, 1.05, 1.01, 0.78; pronotum slightly narrower than head, pronotum length 0.47–0.49, pronotum width 1.77–1.81; fore femora slender without teeth, ratio length/width 7.2, inner surface of fore tibiae not modified; lengths of leg segments (femur, tibia and tarsus): fore leg: 2.67, 2.35 and 1.11 (0.10+1.01), middle leg: 7.02, 5.35 and 3.03 (2.53+0.50), hind leg: 6.95, 4.88 and 1.01 (0.53+0.47). Female terminalia: abdominal sternum VII relatively large, about as long as length of preceding abdominal sterna together, laterally constricted, apical half forming a broad lobe, caudal margin without median notch, not completely covering apex of abdomen in ventral view (Fig. 37).

Macropterous female and macropterous male. unknown.

Etymology. The specific name is derived from the name of type locality, Guizhou Province, China. Distribution. China (Guizhou) ( Fig. 84 View FIGURE 84 ).

Comparative notes: M. guizhouensis sp. nov. fits the diagnostic characters of the M. lituratus group as defined by Chen & Nieser (1993). The paramere shape in this new species is slightly similar to another of our new species, M. astictus sp. nov. (see above), and both occur in the southern region of the Sichuan Basin. However, the paramere blade of M. guizhouensis sp. nov. is relatively stout, and its subapical part is not curved ( Figs. 65 View FIGURES 59 – 66 , 80 View FIGURES 72 – 83 ), whereas the paramere blade of M. astictus sp. nov. is much more slender and slightly curved subapically ( Figs. 63 View FIGURES 59 – 66 , 74 View FIGURES 72 – 83 ). In addition, the larger body length (apterous male: 6.75–6.82; apterous female: 6.35–6.40) ( Figs. 19 View FIGURES 13 – 20 , 27 View FIGURES 21 – 28 , 32 View FIGURES 29 – 33 ) and male proctiger with a pair of blackish dots laterally in M. guizhouensis sp. nov. ( Fig. 57 View FIGURES 44 – 58 ), are other important differences between these two closely related species.