Research Article |
Corresponding author: Jian-Jun Guo ( jjguo@gzu.edu.cn ) Academic editor: Vladimir Pesic
© 2020 Xin-Yao Gu, Lan Jia, Dao-Chao Jin, Jian-Jun Guo.
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:
Gu X-Y, Jia L, Jin D-C, Guo J-J (2020) Contributions to Chinese fauna of Torrenticolidae Piersig, 1902 (Acari, Hydrachnidia), with the description of three new species. ZooKeys 955: 97-111. https://doi.org/10.3897/zookeys.955.52584
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Five species of torrenticolid mites (Acari, Hydrachnidia), collected in the Anzihe and Qingliangfeng national nature reserves, R. P. China, are identified. Three species are described as new to science: Torrenticola pseudosiamis Gu & Guo, sp. nov., T. anziensis Gu & Guo, sp. nov., and Monatractides sichuanensis Gu & Guo, sp. nov. The other two species, M. macrocorpis Gu & Guo, 2019, M. xiaoxiensis Gu & Guo, 2019, are newly reported from Zhejiang Province. Descriptions and illustrations of these species are included.
China, morphology, running waters, taxonomy, torrenticolid mites, water mites
China is rich in ecological diversity and types of water bodies, which suggests that a rich species diversity of water mites is expected in the Chinese fauna. In the number of species, the family Torrenticolidae is one of the largest groups of water mites. Until now, the total number of torrenticolid mites is about 600 worldwide, but only 38 species are known from China, including the three new species added in this paper (
In this paper, five species of Torrenticolidae are identified from two national nature reserves in China, Anzihe National Nature Reserve in Sichuan Province and Qingliangfeng National Nature Reserve in Zhejiang Province. Three of these species are new to science: Torrenticola pseudosiamis Gu & Guo, sp. nov., T. anziensis Gu & Guo, sp. nov., and Monatractides sichuanensis Gu & Guo, sp. nov. The other two are newly reported from Zhejiang Province: M. macrocorpis Gu & Guo, 2019 and M. xiaoxiensis Gu & Guo, 2019. These five species are described and illustrated here.
Water mites were collected, preserved, cleaned, and mounted following the usual methods (
The following abbreviations are used (
All measurements of palp and legs are of the dorsal margin, given in micrometers (μm) and following
Family Torrenticolidae Piersig, 1902
Subfamily Torrenticolinae Piersig, 1902
Genus Torrenticola Piersig, 1896
Holotype : ♀ (ZJ-TO-20180701), Qingliangfeng National Nature Reserve, Lin’an, Zhejiang Province, P. R. China (30°6'44"N, 118°53'36"E, 940 m a.s.l.), collected by Xinyao Gu, 31-VII-2018. Paratype: 2 ♀♀ (ZJ-TO-20180702, ZJ-TO-20180703), same data as holotype.
Idiosoma elliptical; dorsal plate 4+1; infracapitular bay U-shaped; E4 at the same level as the 6th pair of acetabula; gnathosoma with a short rostrum, the lateral view of gnathosoma regular triangle-like.
Female (n = 3): Idiosoma elliptical, L 847 (774–887), W 586 (586–648), L/W ratio 1.4 (1.3–1.4). Dorsal plate 4+1 (Fig.
Male. Unknown.
Streamlet.
Due to the characteristic shape of gnathosoma and dorsal shield (i.e., gnathosoma with a short rostrum, the lateral view of gnathosoma regular triangle-like), this new species is similar to Torrenticola siamis Pešić & Smit, 2009 (
The specific name is from Latin affix: “pseudo-”, which means fake or simulated; this new species is named after its similar species, T. siamis.
China (Zhejiang).
Holotype : ♀ (SC-TO-20160701), Anzihe, Chongzhou, Sichuan Province, P. R. China (30°47'43"N, 103°12'36"E, 1690 m a.s.l.), collected by Zhuhui Ding, 29-VII-2016. Paratype: 1 ♀ (SC-TO-20160702), same data as holotype.
Dorsal plate 4+1; infracapitular bay U-shaped and wide; genital flaps with six pairs of setae at the margins; E4 at the same level as the 3rd pair of acetabula; V1 fused with the line of primary sclerotization; gnathosoma: rostrum long, dorsal apodemes short and sharp, ventral apodemes slender and sharp, claw short.
Female (n = 2): Idiosoma elliptical, L 840 (836), W 583 (576), L/W ratio 1.4 (1.5). Dorsal plate 4+1 (Fig.
Male. Unknown.
Streamlet.
Due to the characteristic shape of gnathosoma and dorsal shield (i.e., gnathosoma with a long rostrum, dorsal and ventral apodemes sharp), this new species is similar to Torrenticola haliki Pešić & Smit, 2010 (
This new species is named after Anzi (Anzi River), where the new species was collected.
China (Sichuan).
Holotype : ♀ (SC-TO-20160703), Anzihe National Nature Reserve, Chongzhou, Sichuan Province, P. R. China (30°47'43"N, 103°12'36"E, 1690 m a.s.l.), collected by Zhuhui Ding, 29-VII-2016. Paratype: 1 ♀ (SC-TO-20160704), same data as holotype.
Infracapitular bay U-shaped and wide; the tip of Cx-I with a papillary cuticular extension, E4 at the same level as the posterior margins of Gf; V1 fused with the line of primary sclerotization; D2 on the same level with muscle scars; dorsal and ventral apodemes of gnathosoma slender and sharp; dorsal seta on P-1 long.
Female (n = 2): Idiosoma elliptical, L 749 (715), W 497 (469), L/W ratio 1.5 (1.5). Dorsal plate 4+1 (Fig.
Male. Unknown.
Streamlet.
This new species is similar to Monatractides harveyi Pešić & Smit, 2012 (
This new species is named after Sichuan Province, where it was collected.
China (Sichuan).
Qingliangfeng National Nature Reserve, Lin’an, Zhejiang Province, P. R. China (30°6'44"N, 118°53'36"E, 940 m a.s.l.), collected by Xinyao Gu, 31-VII-2018, 1 ♀(ZJ-TO-20180704), 2 ♂♂ (ZJ-TO-20180705, ZJ-TO-20180706).
Male (n = 1): Idiosoma L 1083, W 833, L/W ratio 1.3. Dorsal plate 4+1 (Fig.
Female (n = 2). Body features same as the male except: Idiosoma L 1212 (1213), W 945 (949), L/W ratio 1.2 (1.3). Dorsal plate (Fig.
Streamlet.
The populations from Zhejiang Province fit the definition of Monatractides macrocorpis Gu & Guo, 2019 (
China (Hunan, Zhejiang).
Qingliangfeng National Nature Reserve, Lin’an, Zhejiang Province, P. R. China (30°6'12"N, 118°55'12"E, 440 m a.s.l.), female, collected by Xinyao Gu, 31-VII-2018, 3 ♀♀ (ZJ-TO-20180707 – ZJ-TO-20180709).
Female (n = 3): Idiosoma elliptical, L 741 (722–762), W 473 (472–491), L/W ratio 1.6 (1.5–1.6). Dorsal plate 4+1 (Fig.
Male. Unknown.
Streamlet.
The specimens match the general morphology of Monatractides xiaoxiensis Gu & Guo, 2019, a species from China (
China (Hunan, Zhejiang).
Special thanks are given to Zhuhui Ding (Institute of Entomology, Guizhou University, P. R. China) for the collection of the specimens. This research was supported by Guizhou Science and Guizhou Graduate Research Fund Project No. Qianjiaohe YJSCXJH [2019]105, National Natural Science Foundation of China No. 31772421, 31750002, Technology Project No. Qiankehe Pingtai Rencai [2017]5788, Xinyao Gu is supported by a scholarship from the China Scholarship Council (CSC201906670003).