1．脊索幼时或终生具有脊索或类似脊索的构造，脊索动物门(Chordata)即以此得名。脊索是由含胶质的细胞所组成，是一条支持身体纵轴的棒状结构，位于神经索腹侧，消化管的背方。
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拉丁文名:Crettochelys insculpt英文名:the Fly River turtle,the Pig-nosed turtle门: 脊索动物门 ( Chordt )纲:爬行纲(Reptili)目:龟鳖目(Testudint)科:两爪鳖科(Crettochelydide)属:两爪鳖属(Crettochelys)种:猪鼻龟(Insculpt)猪鼻龟 .
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比如，凡长有脊索（包括鲨鱼，蟒蛇，鹈鹕还有你的脊柱）的生物都归属于脊索动物门。
For instance, everything with anotochord (which would be a spine for sharks, pythons, pelicans, you) belongsin the phylum Chordata.
鳄鱼是脊索动物门爬行纲鳄目动物的通称。鳄鱼不仅具有良好的经济价值，还有极高的药用价值。
The crocodile is a general term of animals of Crocodilia, Reptilia, which have high economic and medical value.
这种来自墨西哥和美国西南部的、全为雌性的蜥蜴物种（脊索动物门臼齿蜥科Aspidoscelis属）能够在无需雄性授精帮助的情况下繁殖良种后代。
This all-lady lizard species (of theAspidoscelis genus) from Mexico and the U.S. Southwest manage to produce well-bred offspring without the aid of male fertilization.
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