四川动物  2020, Vol. 39 Issue (3): 309-315

扩展功能

文章信息

王成, 甘佳慧, 米小其
WANG Cheng, GAN Jiahui, MI Xiaoqi
贵州微蟹蛛属一新种及裸微蟹蛛的雄性新发现(蜘蛛目:蟹蛛科)
A New Species of the Genus Lysiteles, with the First Male Description of L. nudus from Guizhou, China (Araneae: Thomisidae)
四川动物, 2020, 39(3): 309-315
Sichuan Journal of Zoology, 2020, 39(3): 309-315
10.11984/j.issn.1000-7083.20200009

文章历史

收稿日期: 2020-01-05
接受日期: 2020-03-19
贵州微蟹蛛属一新种及裸微蟹蛛的雄性新发现(蜘蛛目:蟹蛛科)
王成 *, 甘佳慧 , 米小其     
铜仁学院农林工程与规划学院, 贵州铜仁 554300
摘要:记述了产自中国贵州的微蟹蛛属Lysiteles一新种:梵净微蟹蛛L. fanjingensis sp. nov.及首次记述了裸微蟹蛛L. nudus Yu & Zhang,2017的雄性。提供了它们的外形及外生殖器显微照片和点线覆墨图。标本保存于铜仁学院标本馆。
关键词分类学    蟹蛛    新种    雄性补充    
A New Species of the Genus Lysiteles, with the First Male Description of L. nudus from Guizhou, China (Araneae: Thomisidae)
WANG Cheng *, GAN Jiahui , MI Xiaoqi     
College of Agriculture and Forestry Engineering and Planning, Tongren University, Tongren, Guizhou Province 554300, China
Abstract: A new Lysiteles species, L. fanjingensis sp. nov. (♀), and the unknown male of L. nudus Yu & Zhang, 2017 from Guizhou Province of China are described. Color photographs and plot drawings of diagnostic characters are provided. All specimens are deposited in the Museum of Tongren University, Guizhou Province, China.Lysiteles fanjingensis sp. nov. (Plates Ⅰ, Ⅱ, Ⅴ: C-F)Type material: holotype , Huguosi, Fanjing Mountain National Nature Reserve (108.669 436°E, 27.914 813°N, 1 994 m), Guizhou Province, 14 June 2019, Cheng Wang & Jiahui Gan leg. Paratypes 1 3♀, same date as holotype.Etymology: the species name is derived from the name of type locality; adjective.Diagnosis: the new species resembles those of L. saltus Ono, 1979 (see Ono, 2001: 220, figs. 36-43) in male palp having 2 tibial apophyses (the retrolateral one obviously longer than the ventral one), short embolus less than 1/3 cymbial width, and in female epigyne having foliiform atrial membrane anterior-medially, but differs in: (1) retrolateral tibial apophysis slightly curved medially in ventral view versus straight in L. saltus; (2) ventral tibial apophysis longer and terminally curved towards inner side in ventral view versus straight in L. saltus; (3) embolus curved medially and its tip directed towards 02:30 o'clock in ventral view versus straight and its tip directed towards 04:00 o'clock in L. saltus; (4) atrial membrane of epigyne wider than length versus almost equal to the length in L. saltus; (5) copulatory ducts short, the diameter larger than its length versus less than the length obviously in L. saltus.Genitalia: Male palptibia wider than length, with 2 apophyses, ventral apophysis stout, curved terminally, retrolateral apophysis heavily sclerotized, thumb-shaped and distally blunt; cymbium flat; bulb almost round, with sperm duct extending along the margin; embolus sclerotized, originating at 11:00 o'clock position of bulb, slightly curved medially and with pointed tip directed towards 02:30 o'clock in ventral view. Epigyne with a transparent and foliiform atrial membrane wider than length, located anterior-medially; copulatory openings indistinct, located at the anterior part of the atria, covered by the lateral side of the atrial membrane; copulatory ducts short, its diameter larger than length; spermathecae spherical, the distance between them about 1/3 their diameter.Lysiteles nudus Yu & Zhang, 2017 (Plates Ⅲ, Ⅳ, Ⅴ: A-B)L.nudus Yu & Zhang, 2017: 73, figs. 4-6 (Df).Material examined: 2 3 ♀, Xiangshuiyan, Leigong Mountain National Nature Reserve (108.159 833°E, 26.362 245°N, 1 204 m), Guizhou Province, 1 May 2018, Guijie Tian and Hong Liu leg.Diagnosis: Female diagnosed by Yu & Zhang (2017). The male resembles those of L. niger Ono, 1979 (see Tang et al., 2008: 26, figs. 13a-k) in palp having flat embolus, 2 tibial apophyses (the retrolateral one slightly longer than the ventral one), but differs in: (1) ventral tibial apophysis widest at base in ventral view versus widest at terminal in L. niger; (2) embolus slightly curved terminally in ventral view versus straight in L. niger; (3) ventral tibial apophysis wider than retrolateral tibial apophysis in retrolateral view versus narrower than retrolateral tibial apophysis in L. niger.Genitalia: Female well described by Yu & Zhang (2017); male palp tibia wider than length, with 2 apophyses, ventral apophysis digitiform, retrolateral apophysis heavily sclerotized, distally folded; cymbium flat, widest medially; bulb almost round, with sperm duct extending along the margin; embolus flat, originating from the anterior edge of the bulb, widest at base, slightly curved terminally.
Keywords: taxonomy    crab spider    new species    male supplement    

微蟹蛛属Lysiteles是蟹蛛科Thomisidae中相对较大的一个属,已知的59种主要分布在东亚和南亚(World Spider Catalog,2020)。该属由Simon于1895年根据模式种L. catulus的特征而建立。建立后的80多年内,该属一直被认为是单型属且没有鉴别特征图,直到Ono(1979)重描述了模式种,记述了尼泊尔喜马拉雅地区的8个新种,以及移入了其他3属6种。该属的分类学研究相对较为深入,Ono(1980, 1988, 2001)及Tang等(2007, 2008)先后对日本、不丹和中国云南的微蟹蛛进行了地区性修订。然而,包括模式种在内的25个物种仅有单性记录表明该属仍是一个有待进一步研究的类群。中国是微蟹蛛属种类最丰富的国家,目前已知43种,其中29种为中国特有种(World Spider Catalog,2020)。

笔者在整理贵州梵净山和雷公山蟹蛛科蜘蛛标本时,发现了微蟹蛛属一新种L. fanjingensis sp. nov.和裸微蟹蛛L. nudus Yu & Zhang,2017的未知雄性。本文中所有的测量单位均为mm。步足的测量如下:全长(腿节长、膝节长+胫节长、后跗节长、跗节长)。

梵净微蟹蛛Lysiteles fanjingensis sp. nov. (图版ⅠⅤ:C~F)
图版Ⅰ 梵净微蟹蛛,新种 Plate Ⅰ Lysiteles fanjingensis sp. nov. A-C.雄性触肢male palp,D,E.雄性触肢胫节male palpal tibia;A.前侧面观prolateral view;B,D.后侧面观retrolateral view;C,E.腹面观ventral view;E.插入器embolus,RTA.后侧胫节突retrolateral tibial apophysis,SD.贮精管sperm duct,VTA.腹侧胫节突ventral tibial apophysis;比例尺scales=0.1 mm

图版Ⅱ 梵净微蟹蛛,新种 Plate Ⅱ Lysiteles fanjingensis sp. nov. A,B.外雌器epigyne;C,D.阴门vulva;E,F,G.外形habitus;A.酒精中的腹面观ventral view (in alcohol);B.阿拉伯胶中的腹面观,ventral view (in arabic gum);C.酒精中的背面观dorsal view (in alcohol);D.阿拉伯胶中的背面观dorsal view (in arabic gum);E.雄性,背面观male,dorsal view;F.雄性,腹面观male,ventral view;G.雌性,背面观female,dorsal view;AM.交媾腔膜atrial membrane,CD.交媾管copulatory duct,FD.受精管fertilization duct,S.纳精囊spermathecae;比例尺scales:A-D=0.1 mm,E-G=0.5 mm

图版Ⅴ 梵净微蟹蛛,新种和裸微蟹蛛 Plate Ⅴ Lysiteles fanjingensis sp. nov. and Lysiteles nudus Yu & Zhang, 2017 A,B. Lysiteles nudus Yu & Zhang,2017;C-F. Lysiteles fanjingensis sp. nov.;A,D.雄性触肢,腹面观male palp,ventral view;B,C.雄性触肢胫节,后侧面观male palpal tibia,retrolateral view;E.外雌器,腹面观epigyne,ventral view;F.阴门,背面观vulva,dorsal view;AM.交媾腔膜atrial membrane,CD.交媾管copulatory duct,E.插入器embolus,FD.受精管fertilization duct,RTA.后侧胫节突retrolateral tibial apophysis,S.纳精囊spermathecae,VTA.腹侧胫节突ventral tibial apophysis;比例尺scales=0.1 mm

模式标本:正模♂,贵州省梵净山国家级自然保护区护国寺(108.669 436°E,27.914 813°N,1 994 m),2019年6月14日,王成、甘佳慧采;副模1 ♂ 3♀,采集信息同正模。

词源学:新种拉丁名以模式产地梵净山命名。

鉴别特征:新种与跳微蟹蛛L. saltus Ono,1979(见Ono,2001:220,figs. 36~43)相似,表现在雄性触肢均有2个胫节突,且后侧突均明显长于腹侧突;均有短的插入器,长度不足跗舟宽度的1/3;雌性外雌器前中部均有叶片状的交媾腔膜。但新种明显区别后者在于:1)后侧胫节突腹面观中部略弯曲,而后者明显笔直;2)腹侧胫节突腹面观末端明显向内部弯曲且其长度长于后者,而后者笔直;3)插入器腹面观中部弯折且末端指向02: 30方向,而后者笔直且末端指向04: 00方向;4)外雌器交媾腔膜宽大于长,而后者长宽约相等;5)交媾管短且直径大于长,而后者直径小于长。

描述:雄性体长2.80。头胸部长1.35,宽1.18。腹部长1.61,宽1.01。额高0.18。眼径:前中眼0.10,前侧眼0.15,后中眼0.06,后侧眼0.11;眼间距:前中眼间距0.14,前中侧眼间距0.15,后中眼间距0.24,后中侧眼间距0.26,中眼域长0.26,前边长0.32,后边长0.38。步足量度:Ⅰ 4.59(1.39、1.59、0.93、0.68),Ⅱ 4.80(1.51、1.66、0.95、0.68),Ⅲ 3.24(1.02、1.17、0.59、0.46),Ⅳ 3.37(1.05、1.20、0.66、0.46)。背甲(图版Ⅱ:E)黑棕色,具有不明显的黑色条纹,被有短而细的毛。前后眼列均明显后曲。螯肢黑棕色。颚叶(图版Ⅱ:F)长大于宽,端部具毛簇。胸板(图版Ⅱ:F)棕色,近心形,被稀疏的棕色毛。除第一、二步足腿节和胫节红棕色外,其余步足均为黄色。腹部(图版Ⅱ:E~F)长卵圆形,深棕色,背面前端具有白色条纹,中部有1对黄色斑块,后侧有3条平行的黄色横纹;腹面棕色,两侧具有1对纵向的白色条纹。

触肢器(图版ⅠⅤ:C~D):胫节宽大于长,腹侧胫节突粗壮,末端弯曲,后侧胫节突角质化,拇指状,末端钝;跗舟扁平;生殖球近圆形,贮精管沿其边缘环绕延伸;插入器强角质化,起源于生殖球11: 00方向,中部稍弯曲,末端锋利指向02: 30方向。

雌性体长2.85。头胸部长1.18,宽1.02。腹部长1.73,宽1.56。额高0.20。眼径:前中眼0.10,前侧眼0.19,后中眼0.06,后侧眼0.14;眼间距:前中眼间距0.15,前中侧眼间距0.12,后中眼间距0.25,后中侧眼间距0.28,中眼域长0.25,前边长0.33,后边长0.37。步足量度:Ⅰ 3.39(1.07、1.20、0.61、0.51),Ⅱ 3.53(1.12、1.29、0.61、0.51),Ⅲ 2.70(0.83、0.98、0.40、0.49),Ⅳ 2.90(0.90、1.05、0.46、0.49)。外形特征(图版Ⅱ:G)除颜色稍浅外,均与雄性相似。

外雌器及阴门(图版Ⅱ:A~D图版Ⅴ:E~F):交媾腔膜膜质透明,叶片状,宽大于长,位于前中部;交媾孔不明显,位于交媾腔前侧位,被交媾腔膜侧边缘覆盖;交媾管短,其直径大于长;纳精囊球形,二者间距约为其直径的三分之一。

分布:中国(贵州)。

裸微蟹蛛Lysiteles nudus Yu & Zhang,2017 (图版ⅢⅤ:A~B)
图版Ⅲ 裸微蟹蛛 Plate Ⅲ Lysiteles nudus Yu & Zhang, 2017 A-C.雄性触肢male palp,D,E.雄性触肢胫节male palpal tibia;A.前侧面观prolateral view;B,D.后侧面观retrolateral view;C,E.腹面观ventral view;E.插入器embolus,RTA.后侧胫节突retrolateral tibial apophysis,SD.贮精管sperm duct,VTA.腹侧胫节突ventral tibial apophysis;比例尺scales=0.1 mm

图版Ⅳ 裸微蟹蛛 Plate Ⅳ Lysiteles nudus Yu & Zhang, 2017 A,B.外雌器epigyne;C,D.阴门vulva;E,F,G.外形habitus;A.酒精中的腹面观ventral view (in alcohol);B.阿拉伯胶中的腹面观ventral view (in arabic gum);C.酒精中的背面观dorsal view (in alcohol);D.阿拉伯胶中的背面观dorsal view (in arabic gum);E.雄性,背面观male,dorsal view;F.雄性,腹面观male,ventral view;G.雌性,背面观female,dorsal view;CD.交媾管copulatory duct,CO.交媾孔copulatory opening,FD.受精管fertilization duct,S.纳精囊spermathecae;比例尺scales:A-D=0.1 mm,E-G=0.5 mm

L.nudus Yu & Zhang,2017:73,figs. 4~6 (Df).

标本观察:2 ♂ 3♀,贵州省雷山县雷公山国家级自然保护区响水岩(108.159 833°E,26.362 245°N,1 204 m),2018年5月1日,刘洪、田贵杰采。

鉴别特征:雌性鉴别特征见Yu & Zhang (2017)。雄性与黑微蟹蛛L. niger Ono,1979(见Tang et al., 2008:26,figs. 13a~k)相似,表现在触肢均有扁平的插入器;均有2个胫节突,且后侧突均稍长于腹侧突。但明显区别后者在于:1)腹侧胫节突腹面观基部最宽,而后者是端部最宽;2)插入器腹面观末端稍弯曲,而后者明显笔直;3)腹侧胫节突后侧面观宽于后侧胫节突,而后者明显窄于后侧胫节突。

描述:雄性体长2.95。头胸部长1.45,宽1.31。腹部长1.66,宽1.24。额高0.18。眼径:前中眼0.09,前侧眼0.18,后中眼0.06,后侧眼0.10;眼间距:前中眼间距0.13,前中侧眼间距0.10,后中眼间距0.21,后中侧眼间距0.25,中眼域长0.25,前边长0.32,后边长0.37。步足测量:Ⅰ 4.59(1.61、2.00、1.22、0.76),Ⅱ 5.76(1.68、2.05、1.27、0.76),Ⅲ 3.70(1.10、1.24、0.68、0.68),Ⅳ 3.90(1.17、1.27、0.78、0.68)。背甲(图版Ⅳ:E)黄色,两侧边缘棕色。眼域(图版Ⅳ:E)红棕色,前后眼列均明显后曲。螯肢红棕色。颚叶(图版Ⅳ:F)深黄色,长大于宽,端部具毛簇。胸板(图版Ⅳ:F)黄色,近心形,被棕色细毛。第一、二步足黄棕色,第三、四步足黄色。腹部(图版Ⅳ:E~F)卵圆形,棕色,背面被一不规则的条纹贯穿,前端具有白色的斑点,被细毛;腹面灰白色,中后部有纵向的棕色区域。

触肢器(图版ⅢⅤ:A~B):胫节宽大于长,腹侧胫节突指状,后侧胫节突高度角质化,其末端向后侧面折叠延伸;跗舟扁平,中部最宽;生殖球近圆形,贮精管沿其边缘环绕延伸;插入器扁平,始于生殖球顶部,基部最宽,末端稍弯曲。

雌性:详见Yu & Zhang (2017)

分布:中国(贵州)。

致谢: 感谢铜仁学院刘洪、田贵杰参与蜘蛛标本采集。

参考文献
Ono H. 1979. Thomisidae aus dem Nepal-Himalaya. Ⅱ. Das Genus Lysiteles Simon 1895 (Arachnida: Araneae)[J]. Senckenbergiana Biologica, 60: 91-108.
Ono H. 1980. Thomisidae aus Japan Ⅲ. Das Genus Lysiteles Simon 1895 (Arachnida: Araneae)[J]. Senckenbergiana Biologica, 60: 203-217.
Ono H. 1988. A revisional study of the spider family Thomisidae (Arachnida, Araneae) of Japan[M]. Tokyo: National Science Museum.
Ono H. 2001. Crab spiders of the family Thomisidae from the Kingdom of Bhutan (Arachnida, Araneae)[J]. Entomologica Basiliensis, 23: 203-236.
Tang G, Yin CM, Peng XJ, et al. 2007. Five crab spiders of the genus Lysiteles from Yunnan Province, China (Araneae: Thomisidae)[J]. Zootaxa, 1480: 57-68. DOI:10.5281/zenodo.176872
Tang G, Yin CM, Peng XJ, et al. 2008. The crab spiders of the genus Lysiteles from Yunnan Province, China (Araneae: Thomisidae)[J]. Zootaxa, 1742: 1-41. DOI:10.11646/zootaxa.1742.1.1
World Spider Catalog. 2020. World spider catalog, natural history museum bern[EB/OL]. [2020-01-02].http://wsc.nmbe.ch.
Yu H, Zhang JS. 2017. Two Lysiteles species from Leigong Mountains in Guizhou Province, China (Araneae: Thomisidae)[J]. Acta Arachnologica Sinica, 26(2): 71-75.