Ordre Résumé for Squaliformes
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Réf. Princ. |
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Ordre |
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Squaliformes sleeper and dogfish sharks |
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Classe |
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Elasmobranchii |
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Ordre frère |
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Squatiniformes 155 M years |
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Réf. |
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Premier signalement fossile |
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late Jurassic |
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Présent dans |
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Marin |
Eau douce |
Saumâtre |
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Remarque |
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Two dorsal fins, with or without spines; anal fin absent; five gill slits; spiracles present; nictitating lower eyelid absent. Many species are known from deep water. |
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Classe Étymologie |
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Greek eulanein, elasmos = metal beaten out + Greek brangchia = gills. Ref. 45335. |
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Ordre Étymologie |
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Latin, squalus, squalidus = weak, pale, with rough skin + Latin, forma = shape (Ref. 45335). |
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Familles |
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