Chimarrhometra yunnanensis Ye, Zhou & Bu, 2016, sp. n.
Creators: name: Ye, Zhen
name: Zhou, Yanyan
name: Bu, Wenjun
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Gerridae
Chimarrhometra
Chimarrhometra yunnanensis

description: Chimarrhometra yunnanensis sp. n.
(Figs. 3, 4, 7, 8, 11, 12, 16, 17, 18, 21, 22, 23, 24)
Material examined. Holotype: apterous male, China, Yunnan Prov., Yingjiang county, Tongbiguang village (24°35'N, 97°39'E), 1326 m, 13.VII.2016, coll. Zhen Ye (NKUM). Paratypes: 2 apterous males, 3 apterous females, same data as holotype (NKUM). 1 apterous male, 2 apterous females, Yingjiang county, Tongbiguang village, Dadieshui (24°36'N, 97°39'E), 20.V.2009, coll. Min Li (NKUM).
Diagnosis. The diagnostic features of C. yunnanensis sp. n. are the strongly incrassate male fore femur (Fig. 3); abdominal segment VIII dorsally with a distinct depression in lateral view (Fig. 8); the sub-ovate pygophore (Figs. 11, 12); the antler-shaped processes on the caudal margin of the pygophore bear a narrower posterior lobe and a longer triangular anterior lobe (Figs. 11, 12); the proctiger is slender and with dense hairs on the posterior margin (Fig. 16); the parameres are falciform, with the medial part bending inwards and with apices crossing beneath the pygophore and gradually tapering (Figs. 17, 18); the inner lobe of the first gonopophysis is relatively slender, less infuscated, and with several setae concentrated apically (Fig. 21).
Description. Apterous male (Fig. 3). Colour: ground colour yellowish brown; head dorsum yellowish brown with broad median blackish band, ventrally yellowish; antennal segments I–II brownish yellow, apex of segments darker, III–IV brownish; pronotum yellowish brown, with median and lateral narrow yellowish stripes; mesonotum yellowish brown, with pair of triangular dark, frosted spots; longitudinal bands on thoracic pleura and spots on acetabula blackish with prominent silvery pubescence; legs yellowish brown, with apices of femora, tibiae and tarsi weakly infuscated, fore femora and tibiae ventrally with rows of black spine-like hairs; abdominal dorsum brown, covered with minute golden hairs; ventrally, body including genital segments brownish yellow; abdominal segment VIII dorsally weakly infuscated; pygophore and paramere yellowish, strongly infuscated apically.
Structural characteristics: body length 7.60–7.80 (holotype: 7.75), body width (across acetabula) 2.68–2.72 (holotype: 2.70), body elongate and stout, bearing short, golden or silver, appressed pubescence; head directed forward, head length: 1.15–1.20, head width: 1.41–1.50, head width about 1.23 times length; eyes large, globose, with inner margin emarginated in posterior half; antennal segment I longest, without spine-like hairs, antenna about 0.80 times as long as body, lengths of antennal segments I–IV: 1.90, 1.47, 1.32, 1.38; pronotum width: 1.50–1.57, length: 1.06–1.10, about 1.55 times as wide as long; intersegmental suture between mesothorax and metathorax distinct laterally,; mesonotum about 3.6 times as long as metanotum; fore femur strongly incrassate (Fig. 3); fore tibia slightly curved; middle tarsus about two fifths tibial length; hind femur shorter than middle femur; hind tibia shorter than hind femur; middle and hind tibiae and tarsi ventrally with rows of spine-like hairs; pretarsus inserted slightly before apex of last tarsal segment; lengths of leg segments (femur, tibia and tarsus): fore leg: 2.44, 2.30 and 0.59 (0.21+0.38), middle leg: 6.60, 4.61 and 1.97 (1.35+0.62), hind leg: 5.70, 3.41 and 1.50 (1.00+0.50); pregenital abdominal venter distinctly depressed posteriorly, connexiva slightly widened. Genital segments: abdominal segment VIII much shorter ventrally than dorsally, length: 1.30, width: 1.05, about 1.24 times as long as wide, posterior margin with short, erect, blackish hairs (Figs. 7, 8); abdominal segment VIII dorsally with distinct depression in lateral view (Fig. 8); pygophore sub-ovate (Figs. 11, 12), forked into pair of prominent, vertically raised, antler-shaped processes (Figs. 11, 12), lateral processes bear a narrower posterior lobe and a longer triangular anterior lobe (Figs. 11, 12); proctiger slender, with dense hairs on posterior margin (Fig. 16); paramere large, falciform, medial part bending inwards, with apices crossing beneath pygophore and gradually tapering (Figs. 17, 18).
Apterous female (Fig. 4). Body slightly longer and wider than male, other coloration and markings similar to that of male; body length 8.20–8.55, body width (across acetabula) 2.90–3.05; structure of head including antennae as in male, head length: 1.18–1.20; head width: 1.45–1.50; about 1.23 times as wide as long; antenna about 0.72 times as long as body; lengths of antennal segments I–IV: 1.88, 1.34, 1.30, 1.40; pronotum width: 1.50–1.62, length: 1.00–1.05, about 1.43 times as wide as long; legs similar to those of male except fore femur relatively slender (Fig. 4); lengths of leg segments (femur, tibia and tarsus): fore leg: 2.61, 2.50 and 0.64 (0.23+0.41), middle leg: 6.80, 4.69 and 2.03 (1.38+0.65), hind leg: 5.90, 3.35 and 1.29 (0.78+0.51); genital segments protruding from abdominal apex, proctiger small and cone-shaped; inner lobe of first gonopophysis relatively slender, less infuscated, and with several setae concentrated apically (Fig. 21).
Macropterous male and female: unknown.
Etymology. The specific name is derived from the type locality (Yunnan, China).
Distribution. China (Yunnan) (Fig. 24).
Comparative notes: The general appearance of the new species, C. yunnanensis sp. n. is similar to C. orientalis. However, there are clear differences between the two species as follows. Abdominal segment VIII of C.
yunnanensis sp. n. has a distinct dorsal depression in lateral view (Fig. 8), whereas that of C. orientalis has only a subtle depression (Fig. 6). The antler-shaped processes on the caudal margin of the pygophore in C. yunnanensis sp. n. each bear a narrower posterior lobe and longer triangular anterior lobe (Figs. 11, 12), but those of C. orientalis bear a broad posterior lobe and shorter triangular anterior lobe (Figs. 9, 10). The apical half of the paramere in C. yunnanensis sp. n. is slightly longer than in C. orientalis (Figs. 14, 15, 17, 18). In addition, the inner lobe of the first gonopophysis in C. yunnanensis sp. n. is relatively slender, less infuscated, and with several setae concentrated apically (Fig. 21), whereas the inner lobe of first gonopophysis in C. orientalis is relatively stout, infuscated, and with several uniformly distributed setae (Figs. 19, 20).
description: Published as part of Ye, Zhen, Zhou, Yanyan & Bu, Wenjun, 2016, Description of a new species of Chimarrhometra Bianchi, 1896 (Hemiptera: Heteroptera: Gerridae) from China, pp. 180-188 in Zootaxa 4175 (2) on pages 182-186, DOI: 10.11646/zootaxa.4175.2.6, http://zenodo.org/record/267241