Research Article |
Corresponding author: Guo-Qing Liu ( liugq@nankai.edu.cn ) Academic editor: James Zahniser
© 2018 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 (2018) Notes on some toad bugs from China (Hemiptera, Heteroptera, Gelastocoridae). ZooKeys 759: 137-147. https://doi.org/10.3897/zookeys.759.21627
|
The three species of Nerthra Say, 1832 (Hemiptera: Heteroptera: Gelastocoridae) occurring in China are reviewed. Dorsal habitus photographs of the two species, Nerthra asiatica (Horváth, 1892) and Nerthra indica (Atkinson, 1889), are provided, accompanied by illustrations of male genitalic structures and female ventral aspect of posterior abdominal segments. The male of Nerthra asiatica is recorded and reviewed for the first time.
Hemiptera , Gelastocoridae , Nerthra , China
Toad bugs (Gelastocoridae) are a remarkable group of aquatic bugs (Nepomorpha) which are derived from aquatic ancestors and have become secondarily terrestrial (
The male genitalia were examined in glycerol and illustrated using a Zeiss Discovery V8 microscope. All measurements are given in millimetres (see Table
Species and sex | Range | Body length | Body width | Head length | Head width | Pronotum length | Pronotum width |
Nerthra asiatica | |||||||
Male (N = 1) | 12.3 | 8.2 | 0.8 | 4.8 | 3.3 | 7.2 | |
Female (N = 4) | min | 11.6 | 8.1 | 0.9 | 4.6 | 0.9 | 7.7 |
max | 12.3 | 8.9 | 1.2 | 4.8 | 1.3 | 8.2 | |
average | 11.8 | 8.5 | 1.1 | 4.7 | 1.2 | 8.0 | |
Nerthra indica | |||||||
Male (N = 31) | min | 8.7 | 5.9 | 0.4 | 3.9 | 2.3 | 6.1 |
max | 9.2 | 6.3 | 0.6 | 4.2 | 2.7 | 6.5 | |
average | 9.0 | 6.1 | 0.5 | 4.0 | 2.6 | 6.3 | |
Female (N = 48) | min | 9.6 | 6.6 | 0.4 | 3.9 | 2.4 | 6.7 |
max | 10.3 | 7.8 | 1.1 | 4.5 | 3.1 | 7.8 | |
average | 9.9 | 7.3 | 0.7 | 4.3 | 2.9 | 7.5 | |
Nerthra macrothorax* | |||||||
Male | min | 7.9 | 6.0 | – | – | – | 5.9 |
max | – | – | – | – | – | – | |
average | – | – | – | – | – | – | |
Female | min | 9.2 | 6.7 | – | – | – | 6.8 |
max | 10.6 | 8.2 | – | – | – | 8.2 | |
average | 9.9 | 7.45 | – | – | – | 7.5 |
Mononyx asiaticus Horváth, 1892: 136.
Mononyx
grossus
Montandon, 1899: 395 (syn.
Nerthra
asiatica
:
CHINA: Sichuan Province: 1♂, Mount Emei [峨眉山], 29.58N, 103.41E, 24. IV. 1962, Bai-juan CHEN leg.; 1♀, Ya’an [雅安], 29.98N, 103.01E, 4. VII. 1963, alt. 600–900m, Jiang XIONG leg.; Hubei Province: 1♀, Wufeng Tujia Autonomous County [五峰土家族自治县], 30.20N, 110.67E, 10. VII. 1999, alt. 1000m, Chuan-ren LI leg.; 1♂, National Natural Reserve of Xingdou Mountain [星斗山国家级自然保护区], 30.14N, 109.00E, 30. VII. 1999, alt. 840–900m, Chuan-ren LI leg.; Xizang (Tibet) Autonomous Region: 1♀, Mêdog county [墨脱县], 29.33N, 95.34E, alt. 800m, VIII. 1984, Tan HE leg.
Body large size for the genus. Body dorsally brown with scutellum slightly darker than rest (Fig.
Head. Apical tubercle absent, lateral and superapical tubercles small, irregular in shape, not sharply pointed.
Thorax. Pronotum widest at transverse furrow, a little narrower than abdomen; lateral margins of pronotum parallel or nearly so, anterior and posterior margin weakly sinuate; surface coarsely granulate. Scutellum elevated, apex slightly lobed, with tumescences at the middle of the lateral margins. Hemelytra not extending to the end of the abdomen, membrane well developed; embolium with the basal half of the lateral margin nearly straight, not expanded laterally at middle. Connexivum greatly expanded laterally in females. Bristles short or moderately long, clavate, slightly curved, bristles in rows and clumps on hemelytra and in clumps on scutellum and pronotum.
Abdomen. Abdominal V-IV sternites of male mostly asymmetrical, ninth sternite rather oval, wider than long, not as long as eighth sternite; seventh sternite sternite about half as long as eighth sternite; fifth sternite very short medially (Fig.
China (Sichuan Province, Hubei Province, Xizang (Tibet) Autonomous Region), India (
This is the first time the male has been described. In the shape of the pronotum it would seem to be closely related to N. spissa (Distant, 1911), but the right paramere (Fig.
The holotype is a female from China: Flumen Poi-ho (G. N. Potanin)’ [= Sichuan, Gar Qu (= Pai Ho River)] (
Mononyx
indicus
Atkinson, 1889: 345;
Mononyx
projectus
Distant, 1911: 310 (syn.
Mononyx
turgidulus
Distant, 1911: 311 (syn.
Nerthra
turgidula
:
Nerthra
indica
:
Nerthra
arunachalensis
Thirumalai, 1998: 190; syn.
CHINA: Jiangxi Province: 1♂, Jinggang Mountain [井冈山], 26.75N, 114.29E, 27. VII. 2002, Wan-liang ZHANG & Jian-hua DING leg.; Fujian Province: 1♀, ChongAn [崇安], 27.75N, 118.03E, VI. 1982, Qiang HE leg.; 1♂, Jianning Country [建宁县](26.83N, 116.84E), 26. IX. 2002; Wan-liang ZHANG leg.; 1♂, 2♀, Natural reserve of Jiangshi [将石自然保护区], 27.12N, 117.26E, 13. VIII. 2011, Zhen YE leg.; Guangxi Zhuang Autonomous Region: 1♂, Longsheng country [龙胜县], 25.80N, 110.01E, 14. VI. 1963, Si-kong LIU leg.; 1♀, Yao Autonomous County of Jinxiu[金秀瑶族自治县], 24.13N, 110.19E, 23. IX. 1981, Collector unknown; 1♀, Shengtang Mountain of Jinxiu[金秀圣堂山], 24.96N, 110.12E, alt. 900m, 18. V. 1999, Fu-sheng HUANG leg.; 1♂, 1♀, Defu of Napo country[那坡德孚], 23.39N, 105.83E, alt. 1350m, 21. VI. 2000, Jian YAO leg.; 1♀, Beidou of Napo country[那坡北斗], 23.04N, 105.93E, alt. 550m, 22. VI. 2000, Jian YAO leg.; 1♀, Jingxi Diding Autonomous Region[靖西底定自治区], 23.09N, 105.99E, alt. 1000–1700m, 23. VI. 2000, Jian YAO leg.; 1♂, Tiantang mountain of Rong country[玉林市容县黎村天堂山], 22.58N, 110.73E, alt. 730–740m, 17. VIII. 2009, Bo CAI & Ke-long JIAO leg.; Guizhou Province: 1♂, 7♀, Maolan National Nature Reserve[茂兰国家级自然保护区], 23.43N, 103.02E, 30. VII. 2013, Tong-yin XIE & Fu-xia HE leg.; Yunnan Province: 1♀, Pingbian Miao Autonomous county[屏边苗族自治县], 22.98N, 103.68E, alt. 1500m, 28. V. 1996, Wen-jun BU leg.; 1♂, 1♀, Mengkuan river of Mengla country[勐腊县勐仑镇勐宽河], 21.45N, 101.56E, 18.VIII.2010, Jing WANG leg.; 15♂, 24♀, Menglun town of Mengla country[勐腊县勐仑镇], 21.94N, 101.25E, alt. 534m, 4. VIII. 2010, Kai DANG leg.; 1♀, Nangun river of Cangyuan country[沧源县班洪乡南滚河保护区], 23.29N, 99.10E, alt. 534m, 6. V. 2011; Zhen YE leg.; Xizang (Tibet) Autonomous Region: 1♂, Mêdog county[墨脱县], 29.33N, 95.34E, alt. 1100m, VIII. 1984, Tan HE leg. 2♂, Mêdog county suburb[墨脱城郊], 29.30N, 95.36E, alt. 1100m, 15. VIII. 2003, Huai-jun XUE & Xin-pu WANG leg.; 1♂, 2♀, Beibeng town of Mêdog county[墨脱背崩县城], 29.24N, 95.18E, alt. 780–1100m, 13. VIII. 2003, Huai-jun XUE & Xin-pu WANG leg.; 1♀, Mêdog county-108K[墨脱县城-108K], 29.33N, 95.33E, alt. 880–1100m, 16. VIII. 2003, Huai-jun XUE & Xin-pu WANG leg..
Body middle sized for the genus. Body dorsally brown, with variable yellowish or other marking, often obscured by muddy crust. Scutellum slightly darker than rest of dorsal surface (Fig.
Head. Apex of head with four tubercles, one at the apex is not visible in the dorsal view, the others sometimes rather indistinct (Fig.
Thorax. The lateral margins of the pronotum markedly asymmetrical, pronotum about as wide at anterior third as at the level of the transverse furrow. Scutellum elevated, tumescent laterally and at apex, with curved ridge paralleling sinuosity of posterior margin of pronotum. The outline of the ovipositor was the same and the ventral submarginal tumescences on the last visible abdominal sternite absent. Hemelytra not quite reaching end of abdomen in the females, membrane well developed; embolium narrow at base, dilated before middle, anterior portion and apex of dilation more or less rounded. Ventral surface and the apex of the fore, middle, and hind legs dark brown.
Abdomen. Abdomen greatly expanded laterally in females. Bristles mostly short and clavate, groups of long black bristles on basal tumescences and median part of pronotum. Abdominal sternites of male mostly asymmetrical, but nearly symmetrical in female. Lobes of ovipositor asymmetrical slightly lobed and projecting posteriorly. Ninth sternite wider than long, not as long as eighth sternite; seventh sternite sternite about half as long as eighth sternite; fifth sternite very short medially. Right paramere swollen apically and stick out at middle.
Body shape most closely related to N. lobata (Montandon, 1899) from which it may be separated by the male genitalia shape (Fig.
China (Jiangxi, Fujian, Guangxi Zhuang Autonomous Region, Sichuan, Guizhou, Yunnan, Xizang (Tibet) Autonomous Region), India, Nepal, Vietnam, Laos (
Galgulus macrothorax Montrouzier, 1855: 110.
Scylaecus
macrothorax
:
Peltopterus
macrothorax
:
Nerthra
macrothorax
:
(from
Scutellum rather small, apex narrowed, basal portion depressed, inclining to apex which is the most elevated part. Hemelytra entirely coriaceous, fused together, extending slightly beyond end of abdomen, large longitudinal carinae present; base of embolium greatly expanded laterally. Connexivum broadly expanded laterally in both sexes. Entire body covered with short, broadly clavate bristles, bristles pale and especially dense on pronotum and on the elevations of the head.
Abdominal sternites of female nearly symmetrical except for posterior margin of last sternite, which is slightly emarginated, but with apex slightly convex just below the lobes of the ovipositor, the latter somewhat rounded and the left one overlapping the right. Abdominal sternites of male rather small, last visible abdominal sternite wider than long, nearly twice as long as seventh sternite, which has the right side elongate, spatulate.
Clasper of male rather sickle-shaped, but nearly straight, very slightly enlarged at apex then tapering to a blunt point.
During the daytime this species hides in wet mud or sand, or under stones or plant debris (
China (Taiwan), Japan, Philippines, Malaysia, Indonesia, Australia (
We would like to express our sincere thanks to Dávid Rédei (Nankai University) for providing references and Petr Kment (National Museum, Kunratice) for critically reading the manuscript and providing important suggestions. This study is supported by the “Young Talents” Project of Northeast Agricultural University (No. 16QC04), the Natural Science Foundation of Heilongjiang Province, China (No. C2017017) and Key Laboratory of Soybean Biology, in Chinese Ministry of Education, Northeast Agricultural University (SB16B01).