鳍科鱼

Any of several rays of the family Mobulidae,inhabiting tropical and subtropical seas and having a large flattened body,winglike pectoral fin s,a whiplike tail,and two hornlike fin s that project forward from the head.

蝠鲼任一种蝠鲼科的鳐鱼，生活在热带或副热带海域，有大而扁平的身体和翼状的胸鳍，以及鞭状的尾，头的前部有两个角状的向前突出的鳍

Any of various brightly colored fishes of the family Balistidae of warm coastal waters,having a roundish body and an erectile spine on the anterior dorsal fin that locks upright when the fish is threatened.

科的鱼，生长于温暖的海岸水域中，体型较圆，前部的前鳍有两根直立的硬刺，如果受到威胁，硬刺便直立不动

Type genus of the Amiidae.

弓鳍鱼科的一个模式属。

The RAPD results illustrate that the phylogenetic relationship betweenBothriocephalid tapeworm parasitic in Grass carpCtenopharyngodon idellus(C.et V.and Common carp(Cyprinus carpio L.)from different regions ofChina is infraspecific with noticeable variance bwtween them.Thephylogenetic trees based on the 3 sequences analyses above are constructed,which show the following relationships:Bothriocephalid tapeworms fromGrass carp,Common carp and Luciobrama are found to be monophyletic,and are very close to Bothriocephalus opsariichthydis,but are divergent toanother monophyletic group comprising Bothriocephalid tapeworms fromZacco,Hemiculter and Leuciscus.On the basis of phylogenetic reconstruction,autapomorphic species conceptis used in species delimitation suitablefor determining four species in the present study:B.acheilognathi,B.opsariichthydis,and two other bothriocephalids parasitic respectively inHemiculter and Leuciscus.It is also deduced that the differentiation time ofBothriocephalid tapeworms parasitic in cyprinids is earlier than that of theirhosts,and the most recent specification happened about one million yearsago.Key words Bothriocephalid tapeworm Molecular Systematics

具体成果有：通过RAPD分析探明了我国不同地理分布的草、鲤鱼头槽绦虫的亲缘关系属于种下水平，并存在较高变异；通过基因合并分析重建头槽绦虫的系统发育关系，表明草鱼、鲤鱼及鯮鱼头槽绦虫是单系群，它们与马口鱼头槽绦虫亲缘关系较近，而与〓条、宽鳍鱲及雅罗鱼头槽绦虫构成的另一单系群亲缘关系较远；在此基础上，提出符合头槽绦虫种的界定的独征物种概念，据此确定鲤科鱼类寄生头槽绦虫的四个种：鱊头槽绦虫，马口鱼头槽绦虫，以及另两种分别寄生于〓条和雅罗鱼的头槽绦虫：根据上述研究推断鲤科鱼类寄生头槽绦虫的分化年代早于其宿主，最近的一次物种形成距今约一百万年左右。

Any of various small,soft - finned fishes of the family Cyprinodontidae,which includes the killifishes,topminnows,and many species popular in home aquarium s.

科中的一种小软鳍鱼，其中包括？、底？和许多家庭观赏鱼中常见的品种

Any of various small, soft-finned fishes of the family Cyprinodontidae, which includes the killifishes, topminnows, and many species popular in home aquariums.

鳉鳉科中的一种小软鳍鱼，其中包括鳉、底鳉和许多家庭观赏鱼中常见的品种

Any of various small,soft - fin ned fishes of the family Cyprinodontidae,which includes the killifishes,topminnows,and many species popular in home aquariums.

科中的一种小软鳍鱼，其中包括？、底？和许多家庭观赏鱼中常见的品种

Any of several rays of the family Mobulidae, inhabiting tropical and subtropical seas and having a large flattened body, winglike pectoral fins, a whiplike tail, and two hornlike fins that project forward from the head.

蝠鲼任一种蝠鲼科的鳐鱼，生活在热带或副热带海域，有大而扁平的身体和翼状的胸鳍，以及鞭状的尾，头的前部有两个角状的向前突出的鳍

Any of various colorful tropical marine fishes of the family Ostraciidae, having a body enclosed in bony armorlike plates with only the mouth, eyes, fins, and vent exposed.

箱魨箱魨科中的一种多彩热带海洋鱼，身体由骨质盾片所包围，只有嘴、眼睛、鳍和睦门外露

Small tadpole-shaped cold-water fishes with pelvic fins ''.

小的蝌蚪形冷水鱼，长有形成吸盘的腹鳍；与圆鳍鱼科有关。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。