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目 摘要 for Pristiophoriformes
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主要参考文献 |
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目 |
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Pristiophoriformes saw sharks |
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纲 |
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Elasmobranchii |
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姊妹目 |
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Pristiformes 145 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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late 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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Body sharklike; snout produced in a long flat blade with teeth on each side (teeth unequal in size, usually alternating large and small, and weakly embedded); one pair of long barbels; no dorsal fin spines (sometimes present as internal rudiments); anal fin absent; spiracles large. Maximum length 1.4 m. |
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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, pristis, -eos = a kind of shark + Latin ferre = to carry + Latin, forma = shape (Ref. 45335). |
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科 |
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( n = 1 ) Pristiophoridae |
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