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Research Article
A new species of the genus Cenocorixa (Hemiptera, Heteroptera, Corixidae) from China
expand article infoTong-Yin Xie‡, Guo-Qing Liu§
‡ Northeast Agricultural University, Harbin, China
§ Nankai University, Tianjin, China

Corresponding author: Guo-Qing Liu ( liugq@nankai.edu.cn )

Academic editor: Laurence Livermore
© 2021 Tong-Yin Xie, Guo-Qing Liu.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation: Xie T-Y, Liu G-Q (2021) A new species of the genus Cenocorixa (Hemiptera, Heteroptera, Corixidae) from China. ZooKeys 1055: 89-94. https://doi.org/10.3897/zookeys.1055.63567
ZooBank: urn:lsid:zoobank.org:pub:991016A4-3D48-4201-955D-194A28024F91
Open Access

Abstract

A new species of the genus Cenocorixa Hungerford (Hemiptera, Heteroptera, Corixidae) is described from China. Cenocorixa yuanjiangensis sp. nov. is reported from Yunnan Province. An updated key to the Chinese species of Cenocorixa is presented.

Keywords

Cenocorixa, China, Corixidae, Heteroptera, Nepomorpha, new species

Introduction

The genus Cenocorixa was erected by Hungerford in 1948 and currently contains 11 species. Usinger (1956) provided a key to the Californian (USA) species based on male characters. Jansson (1972) revised the genus, provided a revised key to males, and suggested that stridulation is important for the reproductive isolation of species. Stonedahl and Lattin (1986) reported six species of this genus from Oregon and Washington states (USA). The genus Cenocorixa was widely distributed in the western United States and Canada (Hungerford 1948; Brooks and Kelton 1967; Jansson 1972). Ren and Zhu (2010) subsequently reported three species of this genus from Yunnan Province, China.

In the present paper, we add one new species, Cenocorixa yuanjiangensis sp. nov. With the addition of this new species, the genus Cenocorixa now contains four species in China and eight species in the United States and Canada (GBIF 2021).

Materials and methods

The specimens were obtained from the Institute of Entomology, Nankai University (NKU), Tianjin, China. All specimens were cleaned in an ultrasound cleaner. The antennae were dissected, dried in ethanol, mounted, and sputtered with gold or chromium. The whole specimens and prepared antennae were observed with the use of a Hitachi S-3400N scanning electron microscope in the microscopy laboratory of the large scale instrument and equipment sharing service platform of Northeast Agricultural University, Harbin. Photographs were taken with a camera mounted on a Zeiss Discovery V20 microscope. All specimens studied are deposited in the Institute of Entomology, Nankai University (NKU), Tianjin, China.

Taxonomy

Key to the species of Cenocorixa from China

1 Pala with distinct ridge across face, bearing a curving peg row consisting of 2–35 pegs (Fig. 3A–C) 2
– Pala with inconspicuous ridge across face, bearing a curving peg row consisting of 28 pegs (Fig. 2A) Cenocorixa yuanjiangensis sp. nov.
2 Pala with peg row continuous at transversal oblique ridge 3
– Pala with peg row separated (interrupted) at transversal oblique ridge, containing13 anterior and 16 posterior pegs (Fig. 3C, F) Cenocorixa montana
3 Strigil with 4 or 5 combs, each comb with more than 25 teeth (Fig. 3A, D) Cenocorixa bui
– Strigil with 4 or 5 combs, basal 2 combs with less than 5 teeth, apical combs with more than 25 teeth (Fig. 3B, E) Cenocorixa crestiforma

Cenocorixa yuanjiangensis sp. nov.

http://zoobank.org/88B196AD-A8AA-4000-AE62-9F5B58BC8345
Figures 1, 2

Type material

Holotype ♂, China: Yuanjiang Wangxiangtai Nature Reserve [元江望乡台保护区], 23.38°N, 101.92°E, Yunnan Province, alt. 2020 m, 19.VII.2006, Ming LI leg. Paratypes: same date as holotype, 3♂ 9♀.

Figure 1. 

Dorsal habitus of Cenocorixa yuanjiangensis sp. nov. A male B female.

Diagnosis

The new species is morphologically similar to C. crestiforma Ren & Zhu, 2010, from which it can be separated by the outline of the male pala (Figs 2A, 3B), the distinct pronotal carina on anterior part of pronotum, the feature of strigil (Figs 2F, 3E), and the right paramere (Fig. 2E, G). The Cenocorixa of China are somewhat smaller than species from the Nearctic, varying from 5.10 to 5.80 mm in length. The Nearctic Cenocorixa are distinguished by the presence of the abdominal strigil and by the narrower, more reticulate dark bands of the hemelytra, which tend to form longitudinal stripes (Lauck 1979).

Figure 2. 

Male of Cenocorixa yuanjiangensis sp. nov. A tibia B metaxyphus C pronotal carina D antenna E left paramere F seventh abdominal segment (strigil) G right paramere.

Description

Measurements: Male: Length of body 5.35 mm, width of body 1.72 mm; length of head 0.4 mm, width of head 1.72 mm, width of an eye 0.8 mm, interocular space 0.61 mm; length of pronotum 0.88 mm, width of pronotum 1.53 mm; length of pala 0.50 mm, width of median 0.17 mm; length of front tibia 0.33 mm, length of front femur 0.61 mm; length of segments of mesoleg: femur: tibia: tarsus: claw = 1.88: 0.91: 0.63: 0.80. length of forewing 4.50 mm, length of claval suture 2.11 mm, length of pruinose area of claval suture 0.82 mm; length of prenodal pruinose area of embolium 1.81 mm, length of postnodal pruinose area of embolium 1.02 mm. female: length of body 5.37 mm and width 2.02 mm; length of head 0.33 mm, width of head 1.88 mm, width of an eye 0.82 mm, interocular space 0.68mm; length of pronotum 0.70 mm, width of pronotum 1.58 mm; length of pala 0.59 mm, width of median 0.17 mm; length of front tibia 0.32 mm, length of front femur 0.62 mm; length of segments of mesoleg: femur: tibia: tarsus: claw = 1.81: 0.90: 0.62: 0.79; length of forewing 4.6 mm, length of claval suture 2.12 mm, length of pruinose area of claval suture 1.03 mm.

Moderately large and hairy, varying from 5.10 to 5.37 mm in length. Pattern on hemelytra consisting of numerous small, irregular, broken and anastomosing figures. Postocular space narrow; face depressed in male (Fig. 1A, B); median pronotal carina evident only on anterior third (Fig. 2C). Male pala broad, with longitudinal ridge on outside, at least basally; abdominal asymmetry dextral; strigil moderately large (Fig. 2F).

Color

Body brown, with yellowish patterns (Fig. 1); transverse bands on pronotum yellow; corium and membrane separated by a pale line; Basal 3 segments brown except lateral and posterior margin in male whereas abdomen ventral yellowish in female.

Vertex of head rounded and broad in both sexes; 7–9 bands on pronotum, sometimes discontinuous, equal or slightly wider than dark interspaces; lateral angle of pronotum blunt; lateral lobes of prothorax narrow, sides almost parallel, apex rounded; pala of male broad, with inconspicuous ridge across face, bearing a curving peg row consisting of 28–29 pegs, distal 5–7 pegs longer and spiculate (Fig. 2A); upper palmar bristles separated into two parts, 5 anterior and 26 posterior (Fig. 2A); metaxyphus triangular, base narrower than long; hemelytron with vermiculate patterns but irregular at apex of clavus (Fig. 2B); antennae with four segments, segment I–II thick and short, segment III thick and longest, segment IV slender and half the length of segment III (Fig. 2D); strigil quadrate consisting of 5 combs (Fig. 2F); median setiferous lobe of 7th abdominal tergite narrow and curved, apex blunt(Fig. 2F); right paramere strongly curved at apical 1/3, with a small pointed lobe at tip (Fig. 2G); left paramere of male as shown in Figure 2E.

Figure 3. 

Male foreleg and strigil (Ren and Zhu 2010). A–D Cenocorixa bui B–E Cenocorixa crestiforma C–F Cenocorixa montana.

Distribution

Currently known only from Yunnan Province, China (Fig. 4).

Figure 4. 

Distribution of Cenocorixa within China.

Etymology

Referring to Yuanjiang County in which the type locality situated.

Acknowledgements

This study is supported by the „Academic Backbones“ Project of Northeast Agricultural University (no. 19XG03).

References

  • Brooks AR, Kelton LA (1967) Aquatic and semiaquatic Heteroptera of Alberta, Saskatchewan, and Manitoba (Hemiptera). Memoirs of the Entomological Society of Canada 99: 7–92. https://doi.org/10.4039/entm9951fv
  • Hungerford HB (1948) The Corixidae of the Western Hemisphere (Hemiptera). University of Kansas Science Bulletin 32: 652–724.
  • Lauck DR (1979) Family Corixidae. In: Menke AS (Ed.) The Semiaquatic and Aquatic Hemiptera of California (HeteropteraHemiptera). Bulletin of the California Insect Survey 21: 87–123.
  • Stonedahl GM, Lattin JD (1986) The Corixidae of Oregon and Washington (Hemiptera: Heteroptera). Agricultural Experimental Station, Technical Bulletin 150: 29–38.
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