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Acipenser naccarii -- Storione.
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Acipenser sturio. Lateral view of female.
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Acipenser guldenstadtii, Head Seen from Above.
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Upper Surface of Head of Acipenser glaber, Showing Dermal Soutes.
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Head of Acipenser huso, Seen from Below.
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Acipenser gmelini, Head Seen from Below.
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Upper Surface of Head of Acipenser naccarii, var. Nardoi.
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Acipenser sturio (Linnaeus).
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Acipenser guldenstadtii, Head seen from Below.
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Sturgeon. Acipenser rubicundus
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Acipenser ruthenus (Linnaeus).
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Head of Acipenser nasus, Seen from Above.
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Head of Acipenser sturio, Seen from Above.
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Lake Sturgeon (Acipenser rubicundus LeSueur).
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Sturgeon.
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Acipenser ruthenus, Showing the Cranial Scutes on the Upper Side of the Head.
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Head of Acipenser nasus, Seen from Below.
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Head of Acipenser sturio, Seen from Below.
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Short-Nosed Sturgeon. Acipenser vrevirostrum.
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Sturgeon. Acipenser oxyrhynchus.
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Acipenser ruthenus, Showing the Under Side of the Head, Mouth, Barbels, Pores, Etc..
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Common Sturgeon, Acipenser sturio Mitchill. Potomac River.
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Sturgeon (Acipenser oxyrhynchus).
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Acipenser ruthenus, Var. Gmelini (Fitzinger and Heckel).