The three major commercial species of sturgeons from Caspian and Black seas: top-Huso huso,center-Acipenser stellatus,and bottom

• Acipensergueldenstaedtii(all modified from Fitzinger & Heckel^1 , plate 17, fig.7,plate 16, fig. 6, plate 17, fig. 9, respectively).

(^1) Fitzinger, L.J. & J. Heckel. 1836. Monographische darstellung der GattungAcipenser.Zool.Abh. Ann. WienerMus.Naturgesch. 1:
262 - 326 (note: order of authorship is reversed in some bibliographic citations).

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