蛇类在自然界的地位

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east;mso-hansi-theme-font:minor-fareast; color:black;mso-ansi-language:ZH-CN">和动物界 宋体;mso-ascii-theme-font:minor-fareast;mso-fareast-theme-font:minor-fareast; mso-hansi-theme-font:minor-fareast;color:black">(AnimaliaKWhittaker 宋体;mso-ascii-theme-font:minor-fareast;mso-fareast-theme-font:minor-fareast; mso-hansi-theme-font:minor-fareast;color:black;mso-fareast-language:ZH-CN">I mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black">969) mso-ascii-theme-font:minor-fareast;mso-fareast-theme-font:minor-fareast; mso-hansi-theme-font:minor-fareast;color:black;mso-ansi-language:ZH-CN">。动物界中已知现今存在于地球上的动物约有150万种，如果包括亚种在内，已命名的动物种类可能已超过200万种。为了辨认、研究和利用如此丰富多彩的生物界，人们将它们加以系统整理，分门别类。种，是生物分类的基本单位，具有客观性，是有机界亿万年历史发展的结果。生物之间存在着一定的亲缘关系，为了阐明各种生物之间客观上存在着的关系，根据形态学、解剖学、生理学、胚胎学、生态学和古生物学等方面研究的结果，把相近的“种”归并为“属”， mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black;mso-ansi-language:ZH-CN">相近的属归并为“科”，相近的科归并为“目”,相近的目归并为“纲”，相近的纲归并为“门”， mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black;mso-ansi-language:ZH-CN">相近的门归并为“界”。形成了一个用界 mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black">( mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black;mso-fareast-language:ZH-CN">Kingdom minor-fareast;mso-hansi-theme-font:minor-fareast;color:black">) mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black">、 mso-ascii-theme-font:minor-fareast;mso-fareast-theme-font:minor-fareast; mso-hansi-theme-font:minor-fareast;color:black;mso-ansi-language:ZH-CN">门 mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black">( mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black;mso-fareast-language:ZH-CN">Phylum minor-fareast;mso-hansi-theme-font:minor-fareast;color:black">) mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black">、 mso-ascii-theme-font:minor-fareast;mso-fareast-theme-font:minor-fareast; mso-hansi-theme-font:minor-fareast;color:black;mso-ansi-language:ZH-CN">纲 mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black">( mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black;mso-fareast-language:ZH-CN">Class minor-fareast;mso-hansi-theme-font:minor-fareast;color:black">) mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black">、 mso-ascii-theme-font:minor-fareast;mso-fareast-theme-font:minor-fareast; mso-hansi-theme-font:minor-fareast;color:black;mso-ansi-language:ZH-CN">目 mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black">（ mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black;mso-fareast-language:ZH-CN">Order minor-fareast;mso-hansi-theme-font:minor-fareast;color:black">) mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black">、 mso-ascii-theme-font:minor-fareast;mso-fareast-theme-font:minor-fareast; mso-hansi-theme-font:minor-fareast;color:black;mso-ansi-language:ZH-CN">科 宋体;mso-ascii-theme-font:minor-fareast;mso-fareast-theme-font:minor-fareast; mso-hansi-theme-font:minor-fareast;color:black;mso-fareast-language:ZH-CN">(Family mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black;mso-ansi-language:ZH-CN">)、属 宋体;mso-ascii-theme-font:minor-fareast;mso-fareast-theme-font:minor-fareast; mso-hansi-theme-font:minor-fareast;color:black;mso-fareast-language:ZH-CN">(Genus mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black;mso-ansi-language:ZH-CN">)、种 宋体;mso-ascii-theme-font:minor-fareast;mso-fareast-theme-font:minor-fareast; mso-hansi-theme-font:minor-fareast;color:black;mso-fareast-language:ZH-CN">(Species mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black">) mso-ascii-theme-font:minor-fareast;mso-fareast-theme-font:minor-fareast; mso-hansi-theme-font:minor-fareast;color:black;mso-ansi-language:ZH-CN">这样的分类阶元来表明各种生物之间的亲缘关系的系统。有时，为了更精确地表达种的分类地位，又将各阶元进一步细分，在其下设亚门、亚 mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black;mso-ansi-language:ZH-CN">纲、亚目、亚种，或在其上设超纲、超目等。

minor-fareast;mso-hansi-theme-font:minor-fareast;color:black;mso-ansi-language: ZH-CN">按照这样的分类系统，蛇在自然界的地位应该是： minor-fareast;mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black;mso-ansi-language:ZH-CN;mso-fareast-language:ZH-CN">动物界 mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black">Animal mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black;mso-ansi-language:ZH-CN;mso-fareast-language:ZH-CN">脊索动物门 mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black">Chordata mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black;mso-ansi-language:ZH-CN;mso-fareast-language:ZH-CN">脊椎动物亚门 mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black">Vertebrata mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black;mso-ansi-language:ZH-CN;mso-fareast-language:ZH-CN">爬行纲 mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black">Reptilia mso-ascii-theme-font:minor-fareast;mso-fareast-theme-font:minor-fareast; mso-hansi-theme-font:minor-fareast;color:black;mso-ansi-language:ZH-CN; mso-fareast-language:ZH-CN">有鱗亚纲 minor-fareast;mso-hansi-theme-font:minor-fareast;color:black">Squamata mso-ascii-theme-font:minor-fareast;mso-fareast-theme-font:minor-fareast; mso-hansi-theme-font:minor-fareast;color:black;mso-ansi-language:ZH-CN; mso-fareast-language:ZH-CN">蛇目 minor-fareast;mso-hansi-theme-font:minor-fareast;color:black">Serpentes

mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black;mso-ansi-language:ZH-CN">即蛇在自然界的位置是属于动物界 mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black">， mso-ascii-theme-font:minor-fareast;mso-fareast-theme-font:minor-fareast; mso-hansi-theme-font:minor-fareast;color:black;mso-ansi-language:ZH-CN">脊索动物门 mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black">， mso-ascii-theme-font:minor-fareast;mso-fareast-theme-font:minor-fareast; mso-hansi-theme-font:minor-fareast;color:black;mso-ansi-language:ZH-CN">脊椎动物亚门 mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black">， mso-ascii-theme-font:minor-fareast;mso-fareast-theme-font:minor-fareast; mso-hansi-theme-font:minor-fareast;color:black;mso-ansi-language:ZH-CN">爬行纲 mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black">， mso-ascii-theme-font:minor-fareast;mso-fareast-theme-font:minor-fareast; mso-hansi-theme-font:minor-fareast;color:black;mso-ansi-language:ZH-CN">有鱗亚纲 mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-fareast; color:black">， mso-ascii-theme-font:minor-fareast;mso-fareast-theme-font:minor-fareast; mso-hansi-theme-font:minor-fareast;color:black;mso-ansi-language:ZH-CN">蛇目。