首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 38 毫秒
1.
张文堂(1966)以Palaeolenus deprati Mansuy,1912为模式种建立的Megapalaeolenus Chang,1966,被广泛用作沧浪铺阶上部的三叶虫化石带。然而,近年来有人认为Palaeolenus deprati Mansuy,1912是P.douvillei Mansuy,1912的晚出异名,视Megapalaeolenus属为无效名。本文依据采自云南昆明高楼房下寒武统乌龙箐组上部Megapalaeolenus deprati(Mansuy)的新材料,结合Mansuy(1912)的模式标本进一步对Palaeolenus deprati Mansuy与P.douvillei Mansuy进行仔细对比,确证两者不是同一个种。认为Megapalaeolenus Chang,1966属应该成立。根据地层分布,Palaeolenus和Megapalaeolenus两个三叶虫属仍然可以作为中国下寒武统年代地层单位沧浪铺阶上部的两个化石带。  相似文献   

2.
峡东地区寒武纪三叶虫Palaeolenus的新材料   总被引:4,自引:2,他引:2  
对采自峡东地区宜昌、秭归等地的Palaeolenus Mansuy,1912的新材料的形态、保存状态、挤压变形以及个体发育等方面的研究,提出Megapalaeolenus Chang,1966的模式种Palaeolenus deprati Mansuy。1912是Palaeolenus Mansuy的模式种Palaeolenus douvillei Mansuy,1912的晚出异名,属名Mega palaeolenus Chang和种名Palaeolenus deprati Mansuy均应予以废弃。文中还对原归于Palaeolenus和Megapalaeolenus的种作较大的归并和修订。  相似文献   

3.
作者2004年根据保存于法国的模式标本和产自我国三峡地区的新材料以及对以往所发现的化石材料的研究,认为Megapalaeolenus Chang,1966一属不能成立,是Palaeolenus Mansuy,1912的晚出异名;其模式种Palaeolenus deprati Mansuy,1912也是Palaeolenus的模式种Palaeolenus douvillei,Mansuy,1912的晚出异名.提出属名Megapalaeolenus Chang和种名Palaeolenusdeprati Mansuy均应废弃的结论.最近,罗惠麟等发表了一系列采自模式标本产地附近的标本,为笔者的上述结论提供了更有力的证据.根据这些新材料,笔者不同意罗惠麟等认为Megapalaeolenus继续有效、Palaeolenusdeprati能够成立的观点.  相似文献   

4.
文中通过对我国己发表的palaeolenid类三叶虫中的34个种头盖特征组合进行Q型聚类分析,研究我国palaeolenid类三叶虫属种的分类,并结合传统定性分析,对该34个种(包括2个属、1个亚属和1个亚种)进行修订,且合并成1个属4个种(亚种),即:Palaeolenus douvillei Mansuy,1912,Palaeolenus lantenoisi Mansuy,1912,Palaeolenus lantenoisi longispinus(Chang and Chu,1980)和Palaeolenus fengyangensis Chu,1962。文中还提出沧浪铺组乌龙箐段可采用Palaeolenus fengyangensis带(上)和Palaeolenus lantenoisi带(下)两生物带意见。  相似文献   

5.
文中简要回顾大古油栉三叶虫属Megapalaeolenus是否是有效属的有关讨论。对罗惠麟等(2014)《再论大古油栉虫属Megapalaeolenus》一文做了简要评述,再次从定量分析角度,研究我国Palaeolenus fengyangensis带的palaeolenid类三叶虫分类。其所获得的结论与笔者(2004,2009)从定性分析和林天瑞(2014)应用聚类分析对我国palaeolenid类三叶虫分类及其生物带划分的结论完全一致,即Megapalaeolenus是Palaeolenus的晚出异名,应予废弃;Megapalaeolenus带无效,所在层位属Palaeolenus lantenoisi带。  相似文献   

6.
兰氏古油栉虫(Palaeolenus lantenoisi)的个体发育   总被引:1,自引:1,他引:1       下载免费PDF全文
三叶虫个体发育材料的研究将为分类及系统演化的研究提供重要的依据,因此,历来为各国古生物学家所关注.本文拟就兰氏古油栉虫(Palaeolenus lanlenoisi Mansuy)的个体发育进行一些探讨.所描述标本主要采集于云南昆明筇竹寺地区,个别成虫标本采自云南武定.  相似文献   

7.
古油节虫(Palaeolenus)在安徽凤阳的发现   总被引:2,自引:0,他引:2  
本文所描述的古油节虫(Palaeolenus)的标本,系1960年中国科学院地质古生物研究所和安徽省地质局地质研究所组成的皖中地层队在安徽凤阳发现的。化石产于下寒武统猴家山组的顶部,含化石地层出露情况如下:凤阳林场至蚂蚁山剖面:上复地层:下寒武统馒头组——整合——猴家山组:9.灰色、暗灰色块状灰岩,含矽质及少量燧石结核,产:Palaeolenus fengyangensis Chu(新种)Redlichia sp.1.97米  相似文献   

8.
通过对福建宁化县泉下镇石灰窑下村上石炭统达拉阶(竹蜒)类的系统研究,共描述(竹蜒)类10属35种,包括3个未定种.根据(蜒)类化石在地层中的分布和垂向变化规律,自上而下建立两个(竹蜒)带、三个亚带:Ⅱ.Fusulina-Fusu-linella带,3)Fusulina quasicylindrica亚带,2)Beedeina mayiensis亚带和1)Fusulinella helenae-Pseudosta ffella paradoxa亚带,Ⅰ.Pseudoendothyra ninghuaensis带.为该区以及我国石炭系地层的划分和对比提供重要的素材.  相似文献   

9.
贵州西部晚二叠世的䗴类   总被引:3,自引:0,他引:3       下载免费PDF全文
芮琳 《古生物学报》1979,(3):271-297
本文系统描述了贵州西部晚二叠世的(竹蜓)类6属、51种、一亚种和一未定种,其中24新种;建立了两个带和两亚带,自下而上为:1.Codonofusiella 带,2.Palaeofusulina 带,后者包括(1)P.minima-Nankinella guizhouensis 和(2)Palaeofusulina sinensis 两亚带。对Codonofusiella 带的涵意作了进一步阐述,讨论了Palaeofusulina 作为二叠系和三叠系分界标志的重要意义。并扼要介绍了国外晚二叠世含(竹蜓)地层和贵州西部晚二叠世的(竹蜓)类化石带的对比。  相似文献   

10.
滇东属于奥陶纪扬子地层区西缘的重要组成部分,本文系统描述该地区奥陶系8个层位的三叶虫,共计10科17属18种(其中包括1个新属种,即Daketia spinata gen.and sp.nov.),初步建立区内的三叶虫动物群地层序列,据此可靠确定有关地层的时代,包括:汤池组(特马豆克晚期—弗洛最早期)、红石崖组(弗洛早期—达瑞威尔最早期)、下巧家组(大坪期—达瑞威尔中期)、上巧家组(达瑞威尔晚期—桑比早期)。典型的红石崖组发育于滇东南部的昆明和宜良一带,其上部为含二叶石砂岩,假整合于泥盆纪石英砂岩之下,但是这部分层段在武定-寻甸一线以北地区并未见及,却沉积了一套砂岩、页岩、泥灰岩和白云质灰岩(即下巧家组);按区内地层发育的时空分布来判断,Zhou等(2011)提出的下巧家组和红石崖组上部应系同期异相沉积的观点得到证实。各地层单元的三叶虫动物群分异度低且均为扬子陆块浅水区的常见地方性分子(包括原来记录于越南北部的Vietnamia douvillei(Mansuy)),指示浅内陆棚环境。  相似文献   

11.
12.
13.
14.
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   

15.
16.
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   

17.
18.
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   

19.
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   

20.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号