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1.
<正>"这天下是雄性同胞的天下,我不敢说其他动物,但在长颈象鼻虫的世界里是这样的。"长颈象鼻虫维克多先生总是表现出一副高傲的姿态,在无数枝端和叶尖说这样的话。这也难怪,谁让人家长得那么"帅"气逼人。光鲜亮丽是雄虫长颈象鼻虫来自美丽的马达加斯加,酷爱红黑色经典搭配,尽管其背上鲜红的鞘翅看起来很抢眼,但那毕竟是雌雄虫都有的特征,没啥好炫耀的。因此,其实最让雄性长颈象鼻虫引以为傲的还是它们的脖子。雄长颈象鼻虫有点儿拷贝长颈鹿的造型,脖子比自己身体长出好大一截。每天挺着这么酷的脖子走在树枝尖,回头率可想而知。  相似文献   

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长颈树蜂属(Xiphydria)是长颈树蜂科(Xiphydriidae)最大的一个属,全世界已知26种,现增加采自我国云南的一新种。多斑长颈树蜂Xiphydria Plurimaculata,新种。 雌虫:触角第1~4节、第5节基部2/3和最末一节黑色,其余各节黄白色。头部黑色,上颚基部、唇基、触角窝内上方两斑、颊与它相联向后及向眼内缘伸长部分,以及由眼内缘上方向头顶延伸两纵纹黄白色。胸部黑色,前胸背板侧角,前胸侧板大部分、颈  相似文献   

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记述了贵州兴义法郎组竹杆坡段(中三叠世拉丁期)长颈龙属未定种(Tanystropheus sp.)一幼年个体的不完整骨架。这是该属在欧洲和中东以外的首次发现。新材料仅保存部分颈椎、躯干和前肢。根据特殊的颈椎形态将该标本归入长颈龙属,而区别于另一种长颈的海生原龙类——东方恐头龙(Dinocephalosaurus orientalis)。新标本的腕骨形态简单,骨化程度弱,表明长颈龙是终生水生的动物。“长颈、长颈肋”见于多种不同海生爬行动物(如原龙类、初龙类),它们很可能都以“吞吸”的方式捕食。长颈龙化石在我国的发现进一步验证了中国南方三叠纪海生爬行动物群与欧洲西特提斯动物群(western Tethyan fauna)之间的密切关系。  相似文献   

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贵州中三叠世长颈龙属(原龙目:长颈龙科)一幼年个体   总被引:2,自引:1,他引:1  
记述了贵州兴义法郎组竹杆坡段(中三叠世拉丁期)长颈龙属未定种(Tanystropheus sp.)一幼年个体的不完整骨架。这是该属在欧洲和中东以外的首次发现。新材料仅保存部分颈椎、躯干和前肢。根据特殊的颈椎形态将该标本归入长颈龙属,而区别于另一种长颈的海生原龙类———东方恐头龙(Dinocephalosaurus orientalis)。新标本的腕骨形态简单,骨化程度弱,表明长颈龙是终生水生的动物。“长颈、长颈肋”见于多种不同海生爬行动物(如原龙类、初龙类),它们很可能都以“吞吸”的方式捕食。长颈龙化石在我国的发现进一步验证了中国南方三叠纪海生爬行动物群与欧洲西特提斯动物群(western Tethyan fauna)之间的密切关系。  相似文献   

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屏顶螳螂属一新种   总被引:3,自引:2,他引:1  
屏顶螳螂属Kishinouyeum系长颈螳螂亚科Vatinae中分布于我国的特有属,该属由Ouchi氏建立于1938年,模式种天目屏顶螳螂Kishinouyeum sinensis Ouchi系1936年采自浙江天目山。 1981年6月28日,笔者在海南尖峰岭热带林自然保护区采得屏顶螳螂雌虫一头,经鉴定系一新种。记述于下:  相似文献   

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屏顶螳属Kishinouyeum由Ouchi氏建立于1938年,隶属于长颈螳科Vatidae,长颈螳亚科Vatinac.本记述采自云南西双版纳的屏顶螳属一个新种,短屏顶螳Klshinouyeum breve,sp.nov新种模式标本保存于中国科学院上海昆虫研究所.  相似文献   

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为深入了解拉萨河流域亏祖山不同海拔梯度秋季土壤纤毛虫优势种生态位及其与环境因子的关系,于2015年10月在亏祖山共设置11个样点,用土壤采样器采用梅花五点式采集土样,同时记录相应的理化因子,土样在实验室自然风干后,采用"非淹没培养法"和"活体观察法"进行培养和形态学鉴定。亏祖山11个样点中,共鉴定到土壤纤毛虫132种,隶属3纲14目48科66属,其中14个优势种(Y>0.02)。土壤纤毛虫优势种生态位宽度最大的是明显长颈虫(Dileptus conspicuus),生态位宽度最小的是卵圆前管虫(Prorodon ovum)和似肾形虫(Colpoda simulans)。土壤纤毛虫优势种生态位重叠值位于0.02-0.99之间,生态位重叠值最低的为似肾形虫(Colpoda simulans)和卵圆前管虫(Prorodon ovum),而生态位重叠值最高的为念珠角毛虫(Keronopsis monilata)和膨胀肾形虫(Colpoda inflata)。亏祖山14个优势种生态响应速率之和为负值,表明土壤纤毛虫优势种处于衰退阶段。土壤纤毛虫优势种与环境因子的典范对应分析(CCA)结果显示,轴1和轴2累计解释物种变异的37.8%,表明轴1和轴2能较好地反映优势种与环境因子的关系;总氮是显著解释变量,对优势种变异的解释率为17.6%。综上分析得出,明显长颈虫(Dileptus conspicuus)、点滴半眉虫(Hemiophrys pectinata)和前口瞬目虫(Glaucoma frontata)对土壤环境适应能力较强,具有广泛的生态适应幅度;土壤纤毛虫优势种生态位重叠值低,种间竞争比较弱;土壤纤毛虫优势种之间以及优势种和环境之间尚未达到相对的动态平衡,优势种正处衰退阶段;总氮是影响拉萨河流域土壤纤毛虫优势种分布和生态位的主要环境因子。  相似文献   

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在地史上的中生代,长颈恐龙的肺部所产生的巨大浮力,足以使长颈恐龙浮于水面而游动,但是为什么它的身体竟有5米之多的部位始终沉没于水中?这个离奇的不解之谜,引起了各国古生物学者的巨大兴趣。学者D.G.德庇在挖掘长颈恐龙化石时,往往在其胃部发现许多被食而未消化的小动物化石及许多石块,终于揭开了这个不解之谜。原来,长颈恐龙与鳄鱼一样,会把许多石块食进胃中,以增加体重来使身体沉没于水中,将鼻与眼伸出水面,来捕获猎物。此外,学者J.A.比松还研究了长颈恐龙的四只脚,根据其脚是前端呈尖状的翼型,断定长颈恐龙不是依靠脚蹼来游动的,它如同海豹、企鹅一样,借助于上  相似文献   

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寄生于重庆地区鲢、鳙及草鱼五种外寄生车轮虫的描述   总被引:4,自引:0,他引:4  
对采自重庆地区寄生于鲢、鳙及草鱼鳃上的5种外寄生车轮虫进行了形态学及分类学研究,其分别隶属于:车轮虫属、小车轮虫属及三分虫属,其中包含1新种和中国2新纪录。即钝圆车轮虫Trichodina obtusiformis sp.nov.,急尖车轮虫T.acuta Lom,1961,显著车轮虫T.nobilis Chen,1963,周丛小车轮虫Trichodinella epizootica(Rabbe,1950)Sramek-Husek,1953和大型三分虫Tripartiella macrosoma Basson & Van As,1987。文中对新种进行了详细的描述并提供了新种及已知种的附着盘银染标本之显微照片及齿体线条图。  相似文献   

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采用林间调查和室内饲养等方法,发现了油茶林鳞翅目害虫的3种天敌,即印度长颈步甲Ophionea indica、日本长颈步甲Mimocolliuris insulana和茶梢尖蛾长体茧蜂Macrocentrus parametriates ivorus,前2种天敌主要捕食鳞翅目卷叶类害虫、假眼小绿叶蝉Empoasca vitis等,且为首次在油茶林中发现;茶梢尖蛾长体茧蜂寄生茶梢尖蛾Parametriotes theae幼虫,为首次在广东省记录。记述了3种天敌的形态特征、寄主、国内分布及生物学特性等。  相似文献   

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Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera.  相似文献   

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Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted.  相似文献   

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Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable potent antiproliferative synthetic drugs.  相似文献   

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正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases  相似文献   

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