The features that distinguish the species Adriatic sturgeon (Bonaparte, 1836) (according Tortonese) from A. sturio, the only other species of the same genus present in Italy, consist of the shape of the nose which is more rounded, the smaller labial lobes and in lesser stature. It also features 10-14 dorsal shields, side 32-42, 8-11 ventral. It has brown olive and white on the belly. (Tortonese,1970).
Previously the species had been recognized hallmarks: "The shields are back in the highest center toward their front and rear margin; the side shields are close together. The nose should be gradually narrowed toward the apex, and its upper face is flat or somewhat concave. The upper lip is hollowed out in the middle, the bottom is rudimentary. The inner and outer beards are about the same length and folded back do not come up to the edge of the mouth. The skin is covered here and there with angular badges ". D. 36-48, 24-31 A., V. 26-28, P. 4 / 37-38. (Canestrini S6).
The author still stands an A. nardoi based on the fact that unlike "the face is wide right towards the apex, where it narrows abruptly; the upper face thereof is convex. ... .The Interior painters are somewhat short of the external; these, bent back, stretching to the edge of the mouth. "(Canestrini 1986).
Details that characterize the species are: "The nose is short and rounded, lower lip cracked, the barbs are not frayed and shields are more than two times higher than they are wide" (Muus Dahlstrom et al. 1981). "Barbels near the end of the muzzle to the mouth; wide and rounded snout. The front shields are smaller and less high successive; absence of small bone plates between the mediodorsali and side shields files (Fischer et al. 1987).
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