Figure 18 [Copyright: American Fisheries Society]
| EKEY - The Electronic Key for Identifying Freshwater Fishes | ||||||||
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| Acipenseridae:1a | Bony plates absent between anal fin and midlateral scutes; snout short, the distance from snout tip to anterior edge of upper lip about equal to or less than outer gape width (taken from outer edge of lips, Figure 18 B); mouth large, inner gape width (fro | Acipenser brevirostrum |
| Acipenseridae:1b | Bony plates present (rarely absent) between anal fin and midlateral scutes; snout long, the distance from snout tip to anterior edge of upper lip distinctly more than outer gape width (Figure 18 A); mouth small, inner gape width usually less than 60% (ran | Acipenser oxyrhynchus |
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Click the image to check for a higher-resolution version. Figure 18 [Copyright: American Fisheries Society] |
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| Figure 18: Ventral aspects of sturgeon, Acipenser, heads: (A) Distance "A" one-third to one-half of distance "B" in A. oxyrhynchus. (B) Distance "A" about equal to distance "B" in A. brevirostrum. |
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