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Smith (1944) divided the familiar genus Volvox L. into four sections, placing seven species that lacked cytoplasmic bridges between adult cells in the section Merrillosphaera. Herein, we describe a new member of the section Merrillosphaera originating from Texas (USA): Volvox ovalis Pocock ex Nozaki et A. W. Coleman sp. nov. Asexual spheroids of V. ovalis are ovoid or elliptical, with a monolayer of 1,000–2,000 somatic cells that are not linked by cytoplasmic bridges, an expanded anterior region, and 8–12 gonidia in the posterior region. Visibly asymmetric cleavage divisions do not occur in V. ovalis embryos as they do Volvox carteri F. Stein, Volvox obversus (W. Shaw) Printz, and Volvox africanus G. S. West, so the gonidia of the next generation are not yet recognizable in V. ovalis embryos prior to inversion. Molecular phylogenetic analyses of the five chloroplast genes and the internal transcribed spacer (ITS) regions of nuclear rDNA indicated that V. ovalis is closely related to Volvox spermatosphaera Powers ( Powers 1908 , as “spermatosphara”) and/or Volvox tertius Art. Mey.; however, V. ovalis can be distinguished from V. spermatosphaera by its larger gonidia, and from V. tertius by visible differences in gonidial chloroplast morphology.  相似文献   

3.
The life history of a new homothallic species of Chlamydomonas is described. Sexual reproduction involves the pairing and fusion of naked gametes.  相似文献   

4.
毕志树  李泰辉   《广西植物》1986,(3):193-199
本文根据Henri Romagnesi(1967)的分类系统就作者在广东地区所采集到的红菇属Russula33个种作了分类上的研究。其中新种1种即广东红菇Russula guangdongensis Bi & T.H.Li,sp.nov.,新变种一种即小小红菇Russula minutula var.minor Bi var.nov.和12种国内新记录种。文中有新种及新变种的形态描述及微观图,分种及所属亚组的检索表。  相似文献   

5.
Steering their swimming direction toward the light is crucial for the viability of Volvox colonies, the larger members of the volvocine algae. While it is known that this phototactic steering is achieved by a difference in behavior of the flagella on the illuminated and shaded sides, conflicting reports suggest that this asymmetry arises either from a change in beating direction or a change in beating frequency. Here, we report direct observations of the flagellar behavior of various Volvox species with different phyletic origin in response to light intensity changes and thereby resolve this controversy: Volvox barberi W. Shaw from the section Volvox sensu Nozaki (2003) changes the direction of the flagellar beating plane, while species encompassed in the group Eudorina (Volvox carteri F. Stein, Volvox aureus Ehrenb., and Volvox tertius Art. Mey.) decrease the flagellar beating frequency, sometimes down to flagellar arrest.  相似文献   

6.
Species of Volvox sect. Volvox (Volvocaceae, Chlorophyceae) are unique because they have thick cytoplasmic bridges between somatic cells and spiny‐walled zygotes. This section is taxonomically important because the genus Volvox is polyphyletic. However, taxonomic studies of species in Volvox sect. Volvox have not been carried out on cultured material. Here, we performed a taxonomic study of monoecious species of Volvox sect. Volvox based on the comparative morphology and molecular phylogeny of chloroplast genes and the internal transcribed spacer (ITS) regions of nuclear rDNA using various strains originating from Japan and two preserved strains from the USA. The strains were clearly divided into four species, V. globator L., V. barberi W. Shaw, V. kirkiorum sp. nov., and V. ferrisii sp. nov., on the basis of differences in numbers of zygotes (eggs) in the sexual spheroids, form of zygote wall, and somatic cell shape. Sequences for ITS of nuclear rDNA resolved that the two new species have phylogenetic positions separated from V. globator, V. barberi, V. capensis F. Rich et Pocock, and V. rousseletii G. S. West UTEX 1862 within Volvox sect. Volvox.  相似文献   

7.
生于蒙古栎(Quercus mongolica)和波罗栎(Q.Dentata)上的齿裂菌属一新种,即异襄齿裂菌(Coccomycesdimorphus)。该种因子囊同时以两种状态存在而明显区别于齿裂菌属其它成员。主、副模式标本保藏于安徽农业大学森林保护教研室(AAUFP)。  相似文献   

8.
对中国盲蜈蚣科Cryptopidae盲蜈蚣属Cryptops Leach,1815进行了分类整理,记述了 1新种:宋氏盲蜈蚣Cryptops songi sp.nov.和1新纪习种:多氏盲蜈蚣Cryptops dorize Pocock,1891,提供了该属中国种类检索表.模式标本保存于河北大学生命科学学院.  相似文献   

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记述了泥蜂科沙泥蜂亚科Ammophilinae中国1新纪录属:异足沙泥蜂属Parapsammophila Taschenberg,1869,及该属的1个新种,无脊异足沙泥蜂Parapsammophila vecarinata sp.nov..新种与P.foleyi(de Beaumont)相似,但前者雌性的唇基前缘中部具凹缺,唇基中部无中纵脊;中胸腹板前面正常;前足跗节不对称性较后者强;中足胫节具1距;上颚基半部、唇基前部、触角柄节、鞭节Ⅰ节基部内侧、3对足除基节基部外、前胸背板侧叶、翅基片、腹部除背板Ⅰ基部外为红黄色;雄性触角鞭节Ⅶ~X节内侧为暗红色;外生殖器阳茎端突外缘无齿等特征与后者明显有别.模式标本均采自我国新疆.模式标本保存在云南农业大学昆虫标本室.  相似文献   

11.
A new species of Predaea (Gigartinales, Rhodophyta) is described from Hawaii. It is compared in important morphological details with other species of the genus, all of which are distributed in the subtropics. Predaea is likewise compared to the genera of Nemastomataceae, and should be included in that family. The genus Yadranella Ercegovic (Nemaliales, Rhodophyta) is placed in synonymy with Predaea.  相似文献   

12.
首次报道桂斑螟属Gunungia在中国的分布,首次报道该属的雌性个体,并据此对属征进行了补充描述。桂斑螟属目前只包括模式种Gunungia rimba Roesler & Küppers,分布于印度尼西亚苏门答腊岛。本文记述了采自我国广西、贵州和云南的1新种——凹头桂斑螟Gunungia capitirecava sp.nov.,编制了已知种的检索表,提供了新种的特征图。模式标本均保存在南开大学生命科学学院昆虫标本室。 凹头桂斑螟,新种Gunungia capitirecavasp.nov.(图1 -7) 翅展16.0 -24.5mm。新种与G.rimbaRoesler & K櫣ppers近似,但新种雄性头顶被白色V型鳞毛簇;抱器背在端部1/6处具一齿状突起,阳茎基环两侧臂粗壮,末端圆钝。 正模♂,广西防城港峒中林场, 640m, 2002-04-08 ,郝淑莲、薛怀军采(玻片号RYD04343)。副模: 7 ♂♂,1♀,贵州赤水桫椤, 240m, 2000-09-21 -23 ,于海丽; 1 ♀,云南瑞丽珍稀植物园, 1 000m, 2005-08-05 ,任应党采; 1 ♂,1♀,云南西双版纳自然保护区补蚌管理站,650m,2005—08—25,任应党采。  相似文献   

13.
王遵明 《昆虫学报》1989,32(1):101-104
本文记述青海省瘤虻属一新种,以及过去未记载的Haemetopota ustulata(Kr(?)ber),Tabanus grandicaudus Xu,的雄虫。模式标本保存于中国科学院动物研究所。 1.无带瘤虻Hybomitra(Tibetomyia)afasciata新种(图1)  相似文献   

14.
报道了中国新纪录属脉蚤蝇属Anevrina Lioy,并记述该属2新种,微毛脉蚤蝇A microcilia Liu et Fang,sp.nov.和裸斑脉蚤蝇A.glabrata Liu et Zhu,sp.nov..微毛脉蚤蝇与A.unispinosa(Zetterstedt)相似,但前者Rs脉的细毛极弱,尾器侧尾叶细长;裸斑脉蚤蝇以中足腿节前表面的长卵形裸斑区别于本属其它种.模式标本存于沈阳大学生物与环境工程学院.  相似文献   

15.
记述小石蛾属2新种,长毛小石蛾Hydroptila caesariata Zhou et Yang,sp.nov.(广西)和侧丝小石蛾Hydroptila latifilis Zhou et Yang,sp.nov.(广西);及2新纪录种,一致小石蛾Hydroptila sidong Oláh,1989和穗钩小石蛾Hydroptila verticordia Malicky et Chantaramongkol,2007.根据雄外生殖器下附肢、亚生殖突及第9节后侧突等特征,将我国小石蛾属已知30种归入Marshall(1979)的5个种团,即H.occulta-group,H.pulchricornis-group,H.sparsa-group,H.sparsa-group,H.tineoides-group,H.uncinata-group,及新建种团H.giama-group,编写了6个种团的检索表;新种H.caesariata Zhou et Yang,sp.nov.隶属于H.uncinata种团,新种H.latifilis Zhou et Yang,sp.nov.隶属于H.occulta种团,H.sidong Oláh,1989隶属于H.giama种团.新种及新纪录种模式标本保存于南京农业大学昆虫标本馆.  相似文献   

16.
A new order, Parmales, in the Chrysophyceae has cells with siliceous walls made up of round, triradiate and sometimes oblong plates all fitting edge to edge. In the new family, Octolaminaceae, cell walls have eight plates. Cell walls in the new genus Tetraparma have four round plates and four triradiate plates. Cell walls in the new genus Triparma have three round plates of equal size, one larger round plate, one triradiate plate and three oblong plates. In the new family, Pentalaminaceae, cell walls have three round and two triradiate plates. A total of seven new species and four subspecies are described from subarctic Pacific and Antarctic waters.  相似文献   

17.
中国蚁科新纪录属及一新种记述(膜翅目:蚁科)(英文)   总被引:1,自引:0,他引:1  
本文记述蚁科昆虫一中国新纪录属:凹头臭蚁属PhilidrisShattuck及该属一新种:南方凹头臭蚁P.notialasp.nov.。新种与粗凹头臭蚁P.cruda(Smith)相似,主要区别为:唇基前缘平直;上颚咀嚼缘具10齿,其基缘远端具一列清晰的细齿;体具中等密度的直立毛和丰富的茸毛。正模工蚁,广西北流市,1995年8月26日,沈文铭采.副模5工蚁,记载同正模.正模标本保存于陕西师范大学动物研究所,副模标本保存于广西师范大学生物系。  相似文献   

18.
缘脊叶蝉亚科一新属一新种(同翅目:叶蝉科)   总被引:1,自引:0,他引:1  
本文报道缘脊叶蝉亚科脊翅叶蝉族1新属——长索叶蝉属OmanelinusZhang,gen.n.。并记述该属1个新种——杨长索叶蝉OmanelinuspopulusZhang,sp.n.。模式标本保存在西北农业大学昆虫博物馆(NWAU)和英国伦敦自然博物馆(NHM)。  相似文献   

19.
Abstract  The genus Philidris Shattuck is recorded in China for the first time, and a new species i. e. P. notiala sp. nov. is described in the present paper.  相似文献   

20.
Abstract The present paper deals with the genus Thecabius Koch from China, including 3 subgenera, 9 species and 1 subspecies, among them 1 subgenus, 7 species and 1 subspecies are new to science. The key to the Chinese species of Thecabius is given. At the same time, we discuss the evolutionary relationship between Thecabius and other closely related genera. The specimens studied including the types are deposited in the Institute of. Zoology, Academia Sinica.  相似文献   

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