目 摘要 for Petromyzontiformes
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主要參考文獻 |
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目 |
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Petromyzontiformes lampreys |
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綱 |
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Petromyzonti |
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姊妹目 |
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Chimaeriformes 455 M years |
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參考文獻 |
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最早的化石記錄 |
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late Ordovician |
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生存於 |
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海洋 |
淡水 |
半鹹淡水 |
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附註 |
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No bone; seven pairs of external lateral gill openings; eyes lateral (except in Mordacia; tail isocercal in adults, hypocercal in ammocoete larvae; body naked, eel-like; no paired fins. |
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綱 詞源 |
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Greek, Kephale = head + Greek, aspidos = shield + Greek morphe= shape. Ref. 45335. |
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目 詞源 |
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Latin, petra = stone + Greek, myzo = to suckle + Latin, forma = shape (Ref. 45335). |
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科 |
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