ossa hypuralia
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os hypurale — (plural ossa hypuralia)) hypural (one of the flattened, fused bony haemal spines fanning out at the base of the caudal fin and bearing caudal rays. Amia has 10 hypurals, Salmo 7 but in most teleosts the number is reduced or fused into a single… … Dictionary of ichthyology
