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راسته خلاصه for Heterodontiformes
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مرجع اصلي |
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راسته |
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Heterodontiformes bullhead and horn sharks |
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رده _ تيره |
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Elasmobranchii |
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Sister Order |
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Orectolobiformes 170 M years |
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مرجع |
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First Fossil Record |
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middle Jurassic |
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Occurs in |
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دريايي |
Fresh |
لب شور |
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Remark |
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Two dorsal fins, each with a spine; anal fin present; five gill slits; eyes without nictitating fold; spiracle present but small; nostrils connected with mouth by deep grove. |
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رده _ تيره etymology |
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Greek eulanein, elasmos = metal beaten out + Greek brangchia = gills. Ref. 45335. |
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راسته etymology |
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Greek, heteros = other + Greek, odous = teeth + Latin, forma = shape (Ref. 45335). |
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خانواده ها |
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( n = 1 ) Heterodontidae |
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