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1.
记述了秦岭山区寄生于虹鳟的单殖亚纲一新纪录种:细鳞鲑三代虫Gyrodactylus brachymystacis Ergens,1978,比较了其与我国东北寄生于虹鳟的细鳞鱼三代虫Gyrodactylus lenoki Gussev,1953的区别。初步判断其来源可能一是通过水源来源于秦岭的细鳞鲑,另一种是通过早期虹鳟的引进带人的,其真实的途径及其对环境的风险性还有待于进一步研究。  相似文献   

2.
为查明我国金鱼三代虫的种类,研究采用形态学与分子生物学相结合的方法,对我国6个金鱼主要养殖区的三代虫进行了调查。通过形态测量分析,发现了4种三代虫,分别为:小林三代虫(Gyrodactylus kobayashii)、G.gurleyi、G.longoacuminatus和三代虫未定种(Gyrodactylus sp.)。而通过核糖体rDNA ITS序列比对分析,发现有2种三代虫分别与小林三代虫和G.longoacuminatus相似性在99.1%以上,有1种与G.gurleyi的相似性在98.2%以上,另外,还有1种三代虫与现有序列的相似性都较低,虽然它与小林三代虫的相似性最高,也仅为91.0%,暂为未定种。系统发育分析也显示,金鱼寄生的3种三代虫分别与小林三代虫、G.gurleyi和G.longoacuminatus聚集在一起,另外1种单独聚在一起,这4种三代虫均隶属于G.(Limnonephrotus)亚属,与G.(Gyrodactylus)亚属的秀丽三代虫(G.elegans)的亲缘关系很远。通过对三代虫样品的抽样调查发现,小林三代虫存在于所有采样点,在广州、武汉、郑州3个采样点为优势种,所占的比率都在60%以上;G.gurleyi在海口、南京和上海为优势种,所占的比率都在50%以上;G.longoacuminatus和三代虫未定种所占比率均较小。由此可见,小林三代虫和G.gurleyi是我国金鱼常见的三代虫,G.gurleyi和G.longoacuminatus是中国三代虫新记录种。  相似文献   

3.
文章报道了寄生于鲫(Carassius auratus)鳃部的锚首虫一新种, 鲫锚首虫(Ancyrocephalus carassii sp. nov.)。该虫几丁质结构与寄生于鳜(Siniperca chuatsi)的河鲈锚首虫(A. mogurndae)在整体上很相似, 尺寸略大, 但鲫锚首虫的背联结棒上有两个突起, 背中央大钩基部较后者更粗壮, 且在近钩顶处有一明显的小凹。这是首次在鲫上发现锚首虫科(Ancyrocephalidae)单殖吸虫的寄生。  相似文献   

4.
1、本文为太湖鱼类的寄生蠕虫报告之二。 2、本文报告四种寄生鱼体的複殖吸虫,即鲶后睾吸虫Opisthorchis parasiluri,sp.nov.,寄生鲶胆囊;河鲈源吸虫 Genarches goppo(Ozaki,1925),寄生暗色吐(鱼父)胃肠;鲶似单孔吸虫 Paratormosolus siluri Dubinina et Bychovsky,1954,寄生黃颡鱼及鲶肠;朝鲜鲫吸虫 Garassotrema koreanum Park,1938,寄生鲫、平胸鳊、鲤、蒙古鲌、红眼鳟、青魚、花鲢、白鲢、鲩、短尾鲌、(?)条鱼等消化道。四虫分隸四科四属,其中鲶后睾吸虫为新种,馀三种皆为我国的新纪录。  相似文献   

5.
基于细鳞鲑属Brachymystas鱼类的线粒体DNA控制区基因序列变异,对分布于黑龙江水系中国境内的尖吻细鳞鲑(sharp-snouted lenok)和钝吻细鳞鲑(blunt-snouted lenok),及分布于图们江的图们江细鳞鲑B.tumensis进行分子系统关系研究,为进一步确定黑龙江水系2种细鳞鲑的分类学地位、有效命名及图们江细鳞鲑物种地位性提供分子生物学依据.分布于黑龙江水系的细鳞鲑种群在系统发育树中明显构成2个独立的进化分支,分别对应可经形态鉴别而差异显著的尖吻细鳞鲑和钝吻细鳞鲑,平均序列分歧为1.9%,在属内已达到种间分化水平;图们江细鳞鲑与尖吻细鳞鲑的呼玛河、乌苏里江、奎勒河等种群共同构为1个进化分支,与尖吻细鳞鲑的序列分歧(平均为1.2%)远低于与钝吻细鳞鲑的序列分歧(平均为2.2%).结合形态学的初步研究结果(图们江细鳞鲑的主要形态特征偏向于尖吻细鳞鲑),不支持图们江细鳞鲑独立种的分类地位,建议为尖吻细鳞鲑B.lenok的同物异名,也不支持普遍认为的钝吻细鳞鲑的有效学名为B.tumensis,其有效命名还待商榷,暂属未定名种.综上所述,基于基因序列分析的遗传学结果进一步验证了形态学的分类结论,即在黑龙江水系细鳞鲑属有2个独立的种,分别为尖吻细鳞鲑B.lenok和钝吻细鳞鲑B.sp.,而图们江细鳞鲑B.tumensis应归为尖吻细鳞鲑B.lenok的同物异名.  相似文献   

6.
本文报道我国长江中游铜鱼鳃部寄生的三代虫一新种,即:铜鱼三代虫(新种)Gyrodactylus coreiusisp.nov.,新种的形态特征及其与相近种之间的差别在文中进行了描述和比较。  相似文献   

7.
黑龙江流域两种细鳞鲑的形态学比较及其分类地位初探   总被引:19,自引:0,他引:19  
对比研究了分布于我国黑龙江流域具钝吻和尖吻两种形态特征的细鳞鲑,其主要形态学性状的显著差异达到种间分化水平.细鳞鲑属Brachymystax在中国应有两个种,分别为图们江细鳞鲑B.tumensis(具钝吻特征)和细鳞鲑B.lenok(具尖吻特征).  相似文献   

8.
记述了寄生于广东海洋鱼类黄唇裸颊鲷Lethrinus xanthochilus(Klunzinger),弱棘眶棘鲈Scolopsis eriomma(Jordan et Richardson)和金线鱼Nemipterus virgatus(Houttugn)鳃上的似杯盘虫属Calydiscoides Young,1969 3新种,锚形似杯盘虫Calydiscoides ancoratus sp.nov.,强壮似杯盘虫Calydiscoides robustus sp.nov.和深圳似杯盘虫Calydiscoides shenzhenensis sp.nov.,3新种的鳞盘、背腹中央大钩、中央联结片和侧联结片均相似于已知种,但它们的交接器和阴道与已知种不同.  相似文献   

9.
文章基于线粒体控制区基因序列和微卫星标记比较秦岭细鳞鲑(Brachymystax tsinlingensis Li)、黑龙江流域的尖吻细鳞鲑(Brachymystax lenok Pallas)和钝吻细鳞鲑(Brachymystax tumensis Mori)的分子遗传差异,为澄清其分类地位争议提供分子证据。结果表明:(1)扩增217个样本的mtDNA D-loop区序列,共获得45个单倍型,类群间无共享单倍型;基于单倍型构建的系统进化树显示三个细鳞鲑类群呈独立的支系;(2)基于14个呈多态性位点的遗传分化结果表明,秦岭细鳞鲑与尖吻或钝吻细鳞鲑之间的遗传距离均大于尖吻细鳞鲑和钝吻细鳞鲑之间的遗传距离;(3)基于线粒体D-loop和多态性微卫星位点计算出的遗传分化系数(FST)都远高于0.25表明三个类群间的遗传分化程度极高。这些结果表明,秦岭细鳞鲑与黑龙江流域细鳞鲑之间遗传分化程度高,结合前期发现秦岭细鳞鲑与黑龙江细鳞鲑类群有明显形态分化的研究结果及它们之间地理隔离已久的现状,研究初步判定秦岭细鳞鲑为独立物种,并建议以Brachymystax tsinlinge...  相似文献   

10.
描述了采自广东省阳江市海水网箱养殖尖吻鲈鳃上寄生的单殖吸虫鳞盘虫科Diplectanidae Bychowsky,1957、拟合片虫属Pseudorhabdosynochus Yamaguti,1958中的1新种,文中量度μm,模式标本保存于中山大学华南寄生生物研究中心.  相似文献   

11.
12.
Gyrodactylus ostendicus n. sp. was exclusively found on fins of the common goby Pomatoschistus microps (Krøyer). The haptoral hard parts are among the smallest described for species of Gyrodactylus. A presumed similarity between the new species and G. harengi Malmberg, 1957 (subgenus Metanephrotus Malmberg, 1964) encouraged a comparative approach. A morphological analysis showed the marginal hook sickles of G. ostendicus to be of quite a different type and similar to those of G. arcuatus Bychowsky sensu Bychowsky &; Poljansky (1953) (subgenus Mesonephrotus Malmberg, 1964). The new species has a pharynx with short pharyngeal processes. Its protonephridial system has small bladders, indicating an association with the subgenera Mesonephrotus or Metanephrotus. Molecular phylogenetic analyses, including all of the species of Mesonephrotus and Metanephrotus currently available on the GenBank database, suggested that the new species belongs to Mesonephrotus. Combined morphological and molecular studies of the new species show that G. ostendicus is more closely related to G. arcuatus than to G. harengi.  相似文献   

13.
Lake Tanganyika harbours the most diverse endemic cichlid fish assemblage of Africa, but its monogenean fish parasites have not been investigated. Here we report, for the first time, on the Gyrodactylus parasites in this hotspot of fish biodiversity. Haptor morphometrics and nuclear ribosomal DNA sequences revealed 3 new species on Zambian Simochromis diagramma: Gyrodactylus sturmbaueri n. sp., G. thysi n. sp. and G. zimbae n. sp. Their distinct morphology and strong genetic differentiation suggest that they belong to distant lineages within the genus Gyrodactylus, and phylogenetic reconstructions suggest affinities with other genera of gyrodactylids. Additional U-shaped haptoral plates in G. thysi n. sp. and a second large spine-like structure in the male copulatory organ of G. zimbae seem to represent new features for the genus. Such large diversity on a single host species can probably be explained by host-switching events during the course of evolution, in agreement with the generally accepted concept that ecological transfer is an important aspect of gyrodactylid speciation. Additional parasitological surveys on other host species, covering a broader phylogenetic and geographical range, should clarify the evolutionary history of Gyrodactylidae on cichlids in the African Great Lake and other parts of Africa.  相似文献   

14.
毕志树  郑国杨   《广西植物》1985,(4):361-362
本文报道了广东地区杯伞属Clitocybe(Fr.)Staude的3个新种及5个国内新记录。3个新种是:拟褶杯伞Clitocybe pseudo-phyllophila Bi et zheng,sp.nov.,鳞杯伞Clitocybe furfuracea Bi sp.nov以及亚白杯伞Clitocybe subcandicans Bi sp.nov.。并附与种和种所属分组的检索表。  相似文献   

15.
A Gyrodactylus species from northwestern Sweden is described. Because only one specimen of the species was found no specific name is given. The type of protonephridial system of the new species showed that it belongs to the subgenus G. ( Paranephrotus ). Because of the strong resemblance between the new species and G. hrabei Ergens these two species are placed in a new species group: the G. hrabei-group. The Eurasian fresh water fauna seems to have very few representatives belonging to G. ( Paranephrotus ) and because of this the above find is of special interest.  相似文献   

16.
Gyrodactylus longipes n. sp. (Monogenea, Gyrodactylidae) is described from the gills of farmed juvenile gilthead seabream (Sparus aurata L.) from two sites located in Italy and Bosnia-Herzegovina and represents the second species of Gyrodactylus to be described from S. aurata. Gyrodactylus orecchiae Paladini, Cable, Fioravanti, Faria, Di Cave et Shinn, 2009 was the first gyrodactylid to be described from S. aurata, from populations cultured in Albania and Croatia. In the current study, G. longipes was found in a mixed infection with G. orecchiae on fish maintained in Latina Province, Italy, thus extending the reported distribution of the latter throughout the Mediterranean. The morphology of the opisthaptoral hard parts of G. longipes is compared to those of G. orecchiae, using light and scanning electron microscopy. Gyrodactylus longipes is characterised by having larger, elongated ventral bar processes and long, triangular-shaped toe region to their marginal hook sickles which, by comparison, are rhomboid in G. orecchiae. The marginal hook sickles of G. longipes are almost double the size of G. orecchiae which allows for their rapid discrimination from each other in mixed infections. A comparison of the DNA sequence of the ribosomal internal transcribed spacer 1 and 2 regions (ITS1 and ITS2) of G. longipes with the corresponding sequence from G. orecchiae and with those available in GenBank, supports the separate species status of G. longipes. Part of this study necessitated an overview of the existing Gyrodactylus fauna from Italy and Bosnia-Herzegovina; a summary from each country is provided here to assist future investigations.  相似文献   

17.
Gyrodactylus mexicanus n. sp. and Gyrodactylus lamothei n. sp. are described from the fins and skin of Girardinichthys multiradiatus, an endemic freshwater fish from central Mexico. Gyrodactylus mexicanus is compared to other Gyrodactylus species that parasitize Fundulus spp., the phylogenetically closest group to the Goodeidae from North America. Gyrodactylus mexicanus is distinguished by having large anchors with well-developed superficial roots, enlarged hooks with a proximally disrupted shank (ligament), and a ventral bar with 2 poorly developed anterolateral projections and a small medial process. Gyrodactylus lamothei is distinguished from G. mexicanus and from other species of Gyrodactylus on the North American continent by having anchors with a sclerite on the superficial root and robust hooks with a straight shaft and a recurved point.  相似文献   

18.
We have found that two very common species of North Atlantic shallow water shrimp, Palaemon adspersus and Palaemon elegans, remove and feed on ectoparasites on plaice (Pleuronectes platessa L.). The relationship could be mutualistic, as we did not observe any attempts by the fishes to feed on the shrimps. The ectoparasites removed included monogenean worms (Gyrodactylus sp.) and sea lice (Lepeophtheirus pectoralis). An experiment showed that there were 65% more Gyrodactylus parasites on the fishes that had been apart from compared with those that had been together with shrimps for 48h. Shrimps on coral reefs are known for cleaning fishes, but that shrimps in temperate waters show parasite-cleaning behaviour is, to our knowledge, a new observation.  相似文献   

19.
记述采自湖南省张家界国家森林公园的蚋属Simulium绳蚋亚属Gomphostilbia 2新种,即金鞭绳蚋S.(G.)jinbianense sp.nov,湖南绳蚋S.(G.)hunaiense sp.nov,二者分别以其产地命名.前者主要鉴别特征是两性胫节均具亚基黑环,而后者的雄性后足基跗节呈纺锤形.除对不同虫期作了形态描述外还提供了有关特征图.  相似文献   

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