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Order Summary for Lamniformes
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Main Ref |
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Order |
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Lamniformes mackerel sharks |
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Class |
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Elasmobranchii |
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Sister Order |
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Carchariniformes 135 M years |
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Ref. |
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First Fossil Record |
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early Cretaceous |
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Occurs in |
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Marine |
Fresh |
Brackish |
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Remark |
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Two dorsal fins, without spines; anal fin present; five gill slits, last two may be above pectoral fin; spiracles usually present, small and behind eyes; eyes without nictitating membrane; mouth extending well behind eyes. |
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Class etymology |
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Greek eulanein, elasmos = metal beaten out + Greek brangchia = gills. Ref. 45335. |
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Order etymology |
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Greek, lamna, -es = shark + Latin, forma = shape (Ref. 45335). |
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Families |
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