目 摘要 for Hexanchiformes
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主要参考文献 |
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目 |
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Hexanchiformes frill and cow sharks |
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纲 |
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Elasmobranchii |
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姊妹目 |
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Heterodontiformes 195 M years |
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参考文献 |
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最早的化石记录 |
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middle Jurassic |
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生存于 |
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海洋 |
淡水 |
半咸淡水 |
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附注 |
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One dorsal fin, without spine; anal fin present; six or seven gill slits; eyes without nictitating fold; spiracle present but small and well behind eye. |
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纲 词源 |
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Greek eulanein, elasmos = metal beaten out + Greek brangchia = gills. Ref. 45335. |
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目 词源 |
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Greek, exa = six + Greek, agkone, agko, to strangle, strangulate + Latin, forma = shape (Ref. 45335). |
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科 |
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