稀见枝角类瘦尾细额溞的研究

一、种名细额溞(Oxyurella Dybowski et Grochowski,1894)隶属于甲壳纲双甲目盘肠溞科之盘肠溞亚科,是淡水枝角类中较小的一属鹾奔鱿质蔽窒∩伲灰酌?获。至今仅记载过4个种,即:瘦尾细额溞Oxyurella tenuicaudis(Sars,1862)、环纹细额溞O.singalensis(Daday,1898)、长尾细额溞O.longicaudis(Birge,1909)和林氏细额溞O.1indbergi Brehm,1953。对后一种尚有争议,认为可能是环纹细额溞的同物异名(Green1962)。另外,Brehm(1933)采自非洲Banfora湖的新种Alona gauthieri,R2óska(1952)、Fryer(1957)、Green(1862)等都认为…     

奇异尖额溞若干生物学问题的初步探讨

奇异尖额溞(Alona eximia)系R.Müller氏采自我国广州珠江,由R.W.Kiser于1948年命名发表为新种。我国学者自1954年以来曾先后于广东、黑龙江、江苏、江西、河北等省采获。《中国动物志》记载还分布于广西和山东,作者亦曾在长江的四川和湖北两省境内多处江段中采到。奇异尖额溞在国外分布于尼日利亚(Green,1962),马里(Dumont等,1981)和几内亚(Dumont,1981)。其踪迹涉及亚、非两洲,但发现次数、地点和采获标本数均极少。在江苏太湖中是“分布广,数量小”(堵南山等,1958)。因此认为这个种的特性之一是稀少而种群密度低(Dumont,1981)。1986…     

西方笔纹溞的若干生物学特征

西方笔纹溞的若干生物学特征陈受忠,张道源,张世萍中国科学院水生生物研究所武汉４３００７２华中农业大学水产系西方笔纹（ＧｒａｐｔｏｌｅｂｅｒｉｓｔｅｓｔｕｄｉｎａｒｉａｏｃｃｉｄｅｎｔａｌｉｓＳａｒｓ,１９０１）在我国最初发现于江西￣［４］,嗣后又记述...     

中国枝角类低额溞属一新记录密刺低额溞Simocephalus congener (Koch, 1841)

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尖额溞属一新种(双甲目:盘肠溞科)

本文记述采自四川嘉陵江中的枝角类尖额溞属一新种,其主要特征是后腹部很短而宽,后末缘并不拱圆突出,却缓斜而后急转向肛门陷,使转折处形成一钝角,这在本属中尚不多见。新种复眼大于单眼,爪刺基部无细刺,后腹部栉毛束中各毛长短相近,肛刺有8一10个;壳瓣腹缘前后两端无特别长的刚毛;唇片上也无一撮细毛等特征可与近似种相区别。     

中国枝角类低额溞属一新记录——密刺低额溞Simocephalus congener(Koch,1841)（英文）

<正>The genus Simocephalus Schoedler 1858,a large,nonpelagic daphniidae,are abundant in the littoral zone,expecially with submerged aquatic vegetation in freshwater bodies all over the world.More than 63 specific and subspecific names have been proposed.But in the recent research,all of them were divided into 4 subgenus and regarded as 20valid names[1].More than 12 species of genus Simocephalus were recorded in China[2—5],and most of them need to be re-examined according to modern standards.The valid of Simocephalus congener was controversial.Most authors suppose S.congener to be a synonym of S.exspinosus or a variety in the last century[1].Nowadays,S.     

中国脊额细蜂属分类研究(膜翅目,细蜂科)(英文)

记述了我国脊额细蜂属6种,其中2新种:卜氏脊额细蜂P.buisp.nov.和黑胫脊额细蜂P.nigritibialis sp.nov.;2新纪录种:冠脊额细蜂P.cristatus Townes et Townes和点柄脊额细蜂P.punctibasis Townes et Townes;新种和新纪录种均附有详细特征图,并编制了我国脊额细蜂属分种检索表。模式标本保存于浙江大学膜翅目寄生蜂标本馆(ZJUH)。     

中国美丽尖额溞(甲壳纲:双甲目)的新资料

美丽尖额溞(Alona pulchella King,1853)是广泛分布于澳大利亚区、埃塞俄比亚区以及新热带区的一种枝角类。据中国动物志淡水枝角类卷的记载,在我国只分布于广东、福建、北京、陕西及西藏,而且并不常见,雄性特征也不明。1989年6月中、下旬,在武汉市的中国科学院水生生物研究所一只曾用于培养本市东湖的水草而后閒弃室外的小水缸中,出现了美丽尖额溞的种群,而且有雌雄两性以及带卵鞍的个体,这在过去的文献中从未报道过。     

大齿大尾溞一新亚种(鳃足纲:双甲目)

本文绘图描述了大齿大尾骚的一新亚种,定名为长毛大尾溞Leydigia macrondonta longiseta subsp.nov.新亚种与其它亚种的主要不同是:后腹部每簇侧刚毛中的3—4根刚毛自前至后趋长,并且都比较长。     

The female genitalic region and gonoducts of Embioptera (Insecta), with general discussions on female genitalia in insects

The exoskeleton of the female postabdomen, including the external genitalia and ectodermal gonoducts, was studied in five phylogenetically distant species of Embioptera from the genera Metoligotoma (Australembiidae), Clothoda (Clothodidae), Aposthonia (Oligotomidae), Biguembia (Archembiidae), and Enveja (without family assignment). The morphological interpretation of the embiopteran postabdominal sclerites and gonoduct components is discussed in a wider context of Insecta. This includes some issues of general importance, such as effects of the translocation of the gonopore from venter 7 to venter 8, the definition of gonopore location, and the definition of the vagina. We then compare the five study species regarding their postabdominal morphology, and define characters that can be used for future phylogenetic and taxonomic work on Embioptera; the corresponding character states are presented in a matrix. Important results on Embioptera are as follows. (1) The gonopore appears to lie in the posterior part of venter 8, but this apparent location probably only results from the median parts of venter 8 having been formed from an extension of venter 7. (2) The ectodermal gonoducts consist of a common oviduct and an extended oviduct, while there is either no vagina or only a very short and wide one. (3) In contrast to earlier reports, accessory glands are absent from venter 9 (although there may be vestiges in Enveja). (4) No support was found in female genital characters for the conventional view that the Clothodidae are the sister group of the remaining Embioptera; instead, we report several character states suggesting Metoligotoma as sister to the remaining Embioptera.     

On the resurrection of the cladoceran species Chydorus reticulatus Daday, 1898 (Chydoridae,Cladocera) and its relationship to Chydorus ventricosus Daday, 1898

The chydorid species Chydorus reticulatus Daday, 1898 and Chydorus ventricosus Daday, 1898 are redescribed and literature records reevaluated on the basis of new material from India.Contribution 9 Department of Biology, Indiana University, Bloomington. This study was supported in part by NSF Grant DEB76-20237 to D. G. Frey.     

The Cladocera of Sri Lanka (Ceylon), with remarks on some species

The freshwater Cladocera of Sri Lanka has been revised based on the study of over 700 zooplankton samples collected from all habitat types during 1965–1980. The cladoceran fauna is represented by six families; members of the families Polyphemidae, Leptodoridae and Holopedidae are absent. The common temperate genus Daphnia is rare.Sixty-two species have been recorded from Sri Lanka. Of these, five are new records. Remarks on a few species are given with illustrations. The distribution of Cladocera in different types of habitats is discussed. The greatest species diversity was found in ponds. The Sri Lankan fauna is numerically and in species diversity typical of tropical cladoceran fauna. It resembles the southern Indian fauna very closely except for the absence in Sri Lanka of the genera Acroperus and Camptocercus.     

ParStream-seq: An improved method of handling next generation sequence data

The exponential growth of next generation sequencing (NGS) data has put forward the challenge for its storage as well as its efficient and faster analysis. Storing the entire amount of data for a particular experiment and its alignment to the reference genome is an essential step for any quantitative analysis of NGS data. Here, we introduce streaming access technique ‘ParStream-seq’ that splits the bulk sequence data, accessed from a remote repository into short manageable packets followed by executing their alignment process in parallel in each of the compute core. The optimal packet size with fixed number of reads is determined in the stream that maximizes system utilization. Result shows a reduction in the execution time and improvement in the memory footprint. Overall, this streaming access technique provides means to overcome the hurdle of storing the entire volume of sequence data corresponding to a particular experiment, prior to its analysis.     

Contributions to the Cladocera fauna from Papua New Guinea

Twenty-eight taxa of the Cladocera are identified in collections from Papua New Guinea, 17 being new records for New Guinea, bringing the total number of Cladocera taxa reported for this region to 39. Most of the taxa are circumtropical. One species (Sarsilatona papuana) is endemic to Papua New Guinea and northern Australia. The species list includes two species that are normally listed as Holarctic:Alonella nana andAlona rustica. Widespread genera such asDaphnia, Pleuroxus, Disparalona, Acroperus were strikingly absent from the Papua New Guinean material.     

A checklist of the Cladocera of Israel and Eastern Sinai

Sixty species of Cladocera are recorded from Israel and Eastern Sinai after the examination of several collections, and include 18 new records for the area as well as 9 species known only from the literature. Chydoridae dominate the fauna, with 27 species recorded, followed by Daphniidae with 21 species.     

Morphology and the classification of the so-called Cladocera

The validity as a monophyletic taxon of the group of branchiopod crustaceans long regarded as constituting the Cladocera is questioned. This seems in fact to be a heterogeneous assemblage whose members probably merit assignment to four separate orders. The Onychopoda and Haplopoda (the so-called Gymnomera) clearly stand apart from the Ctenopoda and Anomopoda (the so-called Calyptomera) and differ in important respects from each other. While sharing several characters, some doubtless indicative of distant ancestral similarities, others probably convergent, the Ctenopoda and Anomopoda differ in many respects, have clearly evolved along different lines, and are probably much less closely related than is generally assumed.