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目 摘要 for Carcharhiniformes
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主要参考文献 |
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目 |
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Carcharhiniformes ground sharks |
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纲 |
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Elasmobranchii |
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姊妹目 |
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Lamniformes 135 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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early Cretaceous |
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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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Two dorsal fins (one dorsal fin in the scyliorhinid Pentachus profundicolus, known only from the holotype), without spines; anal fin present; five gill slits, with the last one to three over the pectoral fin; gill rakers absent; eyes with nictitating fold or membrane; spiracles present or absent; intestinal value of spiral or scroll type. Development may be oviparous, ovoviparous, or viviparous. |
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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, carcharias = shark Latin, clupea}, sardine + {Latin. Shape}, look, appearance, shape. 1880 (Ref. 45335). |
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科 |
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