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记述了辽宁西部九佛堂组和义县组中华弓鳍鱼一新种:辽宁中华弓鳍鱼Sinamia liaoningensis,并与该属的其他种进行了比较.新材料具有中华弓鳍鱼科的3个定义特征:单一的顶骨,三对额外肩胛骨和膜质翼耳骨短并与顶骨等长,无疑应归入该科.新种的后眶下骨较小,背鳍长大,鳞片菱形,因此,归入中华弓鳍鱼属.辽宁中华弓鳍鱼在以下几个方面不同于中华弓鳍鱼的5个已知种:体型短粗,吻骨较短,鼻骨近四方形,围眶骨较多(6),前鳃盖骨强烈弯曲,背鳍条较少(18),尾鳍条较多(16),臀鳍鳍基起点到鱼体背缘的鳞列较多(32),鳞片后缘不具锯齿,尾鳍具有纤维状的角质鳍条.  相似文献   

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The shell and anatomy of a new genus and species of Lymnaeidae,Kutikina hispida, are described from the Franklin River, S.W.Tasmania and the implications of this discovery, along withthe origins and relationships of the Australasian Lymnaeidae,are discussed. The new species lives attached to submerged limestonerock, has a very expanded shell aperture and, uniquely, theperiostracum bears short hairs. In addition there are apomorphicradular and anatomical characters separating this genus fromother lymnaeids. The new genus is compared with the other nativeAustralian Lymnaeidae. It is suggested that the taxonomy ofthe only other native Tasmanian species of Lymnaeidae, Austropepleatomentosa, a species widely distributed in temperate Australiaand in New Zealand, requires reexamination. Alternative hypothesesrelating to the zoogeography of the southern members of thefamily are discussed in relation to this taxon and the Recentgenus-group taxa of lymnaeids are listed in an Appendix andtheir differences from the new genus noted. (Received 20 June 1996; accepted 17 January 1997)  相似文献   

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本文报道我国盘菌属中两个具有绣球样子囊果的种。一个是新种贵州盘菌(PezizaguizhouensisM.H.Liu);另一个是国内新记录种希氏盘菌[Pezizshearii(Gilkey)Korf]。文中对新种作了拉丁描述并附图,描述了新记录种并附图。还为该属中具绣球样子实体的已知种提供了检索表。新种模式标本的主模式保藏在HMAS,等模式保藏于贵州省安顺地区卫生防疫站标本室(GZAS)。  相似文献   

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Fossils from the Oligocene of western Montana described in this treatment are the first structurally preserved ovulate cones of Pinus to be reported from the Tertiary of North America. They are about 5.5 cm long and have a maximum diam of 2.5 cm. Numerous scales are arranged spirally around the axis and each scale bears two winged seeds. The bract subtending the ovuli-ferous scale is 3-4 mm long and is free from the scale throughout its length. The pith and cortex of the axis are constructed of thick-walled parenchyma cells and 18-21 resin canals occur at the inner edge of the cortex. Resin canals entering the base of the ovuliferous scale are restricted to the abaxial side with vascular tissues occupying the adaxial side. Vascular strands near the tip of the scale are strongly rounded on the adaxial or phloem side. At the abaxial side of the tip of the ovuliferous scale is a broadly rhomboidal apophysis with a raised umbo that terminates in a short spine. The fossils differ from the several Recent cones examined in having fewer resin canals and biseriate rays in the secondary xylem of the cone axis. The shape of the cone, its anatomical features, and the morphology of the tip of the cone scale indicate affinity with the subgenus Diploxylon.  相似文献   

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A fourth foliicolous species ofAnisomeridiumis described.Anisomeridium musaesporoideshas so far only been found in Guyana and Panama. It is characterized by applanate perithecia with a white marginal zone, large spores with a submedian septum and apical ostiole. A key to all known foliicolousAnisomeridiumspecies is provided.  相似文献   

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辽西下白垩统九佛堂组尾羽龙类—新属(英文)   总被引:2,自引:0,他引:2  
记述了一件采自辽西热河群九佛堂组一新的窃蛋龙类:义县似尾羽龙(Similicaudipteryx yixianensis gen.et sp.nov.),并依据其和尾羽龙属的相似特征,及其匕首状的尾综骨,肠骨、踱骨和脚趾的形态等将其归入窃蛋龙类的尾羽龙科,但其所具有的一些特征也不同于该科已建立的尾羽龙属,如尾综骨的形态和较大的个体等。该化石具有许多典型的窃蛋龙类的特征,如短尾、较短的前肢等,有别于其他窃蛋龙类的特征还包括耻骨和肠骨的长度比为1.46,背椎上发育2个大而深的椎体下突、背椎侧部具孔等。义县似尾羽龙是又一类具有真正尾综骨的恐龙,表明尾综骨这一曾经被认为是鸟类特有的结构可能是在恐龙中独自演化的。它具有一些进步的特征如具尾综骨等,但同时也具有一些原始的特征如5个愈合的荐椎,耻骨联合长,表明在窃蛋龙类中存在着特征的镶嵌进化现象。似尾羽龙与驰龙类、其他窃蛋龙类等恐龙一样,脚趾并没有对握,已有的证据说明完全的对握目前还只是出现于鸟类中。根据其短尾、中部收缩的趾骨和灵巧的身体等都表明它是一类适于快速奔跑的动物。目前为止,已知的尾羽龙类化石均发现于北票四合屯地区的义县组下部尖山沟层(段),距今约125Ma。新标本发现于义县西二虎桥地点,属于九佛堂组,距今约120Ma,这也是迄今为止在九佛堂组发现的惟一一件尾羽龙类化石,对研究早白垩世窃蛋龙类的演化和热河生物群恐龙组合的特征具有重要的意义。  相似文献   

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Fossils described in this treatment are the first structurally-preserved ovulate cones of Picea to be reported from the Tertiary. They are 5.0-5.8 cm long and 1.6-1.8 cm at their widest diameter. Numerous ovuliferous scales are arranged spirally around the axis and each bore two winged seeds. The bract subtending the scale is 4.0-7.0 mm long and is fused to the scale for 1.0 mm. The base of the bract is inflated on the abaxial side extending for about 1.0 mm between the seeds of the adjacent scales. Both the scales and their subtending bracts are recurved at their point of divergence from the axis. The ovuliferous scales taper gradually to a point, and the thickness of the tissues at the scale apex indicates that they were woody. Anatomically, the silicified cones are very similar to those of the Recent species and indicate that all important features of the latter had evolved by Oligocene time.  相似文献   

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记述了我国蚤蝇科蚤蝇属Phora 1新种,又突蚤蝇Phora furcularis Liu et Wang,sp.nov.和1新纪录种,缺齿蚤蝇P.edentata Schmitz.P.furcularis与P.zherikhini Mostovski相似,但前者额向后渐狭,生殖背板侧叶无钩状突,且左侧尾叶后背部生有Y形脊.模式标本存于沈阳大学生物与环境工程学院.  相似文献   

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记述了中国蚤蝇科锥蚤蝇属Conicera 1新种和1新纪录种,指突锥蚤蝇Conicera digitalis sp.nov.和方叶锥蚤蝇Conicera quadrata Michailovskaya.指突锥蚤蝇与肾叶锥蚤蝇相似,但两者在前缘脉指数及侧尾叶形状上有所区别.模式标本存于沈阳大学生物与环境工程学院.  相似文献   

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记述了盲蝽科1新种,金毛束盲蝽Pilophorus fulvicomus sp.nov..报道了中国4新纪录种:印度蚁叶盲蝽Hallodapus indicus(Poppius,1911),九州蚁叶盲蝽Hallodapus kyushuensis Miyamoto,1966,贝克束盲蝽Pillphorus bakeri Schuh,1984和印支宽敖盲蝽Wygomiris indochinensis (Schuh,1984).提供了新种和新纪录种雄性生殖器特征图.模式标本保存于南开大学昆虫学研究所.  相似文献   

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记述采自西藏墨脱地区斑腿蝗科1新属及2新种,即直缘秃蝗属Rectimargipodisma gen.nov.,墨脱直缘秃蝗Rectimargipodisma medogensis sp.nov.及刺胸外斑腿蝗Xenocatantops acanthracus sp.nov.,并首次描述了短翼蚱科的侧角狭蚱Xistra laticorna Zheng的雌性.模式标本保存于华东师范大学生命科学学院标本室.  相似文献   

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Munychryia Walker and Gephyroneura Turner are separated from other Anthelidae as the Munychryiinae subfam. nov., using characters of both adult and immature stages. A new species, M. periclyta , is described from south-western Australia.  相似文献   

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北票尖山沟义县组下部两种膜翅目昆虫化石   总被引:3,自引:0,他引:3  
描述了产自辽这西部北票上园地区尖山沟上侏罗统义县组上部膜翅目昆虫化石1新属2新种。新属新种Procretuania Pristina gen.et sp.nov.归人白垩旗腹姬蜂科(Cretevaniidae),新种Gurvanotrupes liaoningensis sp.nov。归入细蜂科(Serphidae).这是Cretevaniidae科和Gurvanotrupes属在我国的首次发现  相似文献   

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记述了中国长角食蚜蝇属1新种:紫柏长角食蚜蝇Chrysotoxum zibaiensis sp.nov.,模式标本保存于陕西理工学院生物系陕西省资源生物重点实验室动植物标本馆。中国1新纪录种:弓斑长角食蚜蝇Chrysotoxum arcuatum(Linneaus,1758)。 紫柏长角食蚜蝇。新种Chrysotoxum zibaiensis sp.nov.(图1-8) 雌性 未知。 ♂体长12mm,翅长12mm。 正模♂,凤县,2003-06-27;副模1♂,留坝,2003—06—26,霍科科采。 新种近似天台长角食蚜蝇Chrysotoxum tiantaiensis,但新种腹部第1~2背板侧缘黄褐色区域宽,第3背板几乎整个黄褐色,第4背板侧缘黄褐色,第2、4、5背板后缘黄褐色,雄性尾器不同,新种尾器被毛黄褐色。 词源:新种种名以模式产地命名。 弓斑长角食蚜蝇Chrysotoxum arcuatum(Linneaus,1758)中国新纪录 观察标本:1♀,吉林长白山,1977-08-03~12。 国外分布:伊郎,蒙古,日本,欧洲,前苏联。  相似文献   

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Abstract:Porina otagensis P. M. McCarthy (Trichotheliaceae) is described from semi-aquatic rocks near Dunedin in the South Island of New Zealand. It has perithecia with a thin, applanate to convex, spreading involucrellum, rather short but broad, 7-septate ascospores that lack a gelatinous sheath, and comparatively broad conidia.  相似文献   

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The present paper deals with ten new species and one new genus of Delphacidae fromvarious parts of China. These type specimens are kept in the authors institutions re-spectively. 1. Stenocranus hongtiaus Kuoh sp. nov. (fig. 1) This species resembles S. matsumurai Metcalf, but may be separated by the body dis-tinctly smaller, the pronotum and mesonotum with two orge-red stripes, the form ofthe processes of the anal segment, and of the inner margin of the genital styles.  相似文献   

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