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Definition of Term

(English) The bony structure (often fan-shaped) that chiefly is composed of the expanded, flattened and partially fused hemal spines (ventral extensions of the vertebrae), and that supports the caudal-fin rays in most bony fishes; when counting vertebrae, this composite element is treated as a single vertebra and included in the count. Amia has 10 hypurals, Salmo 7 but in most teleosts the number is reduced or fused into a single structure, the urostyle. (See also: caudal fin, hypural bones, vertebral counts)
(French) Structure osseuse (souvent en forme d’éventail) qui est formée par les épines hémales allongées, aplaties et partiellement soudées (extensions ventrales des vertèbres), et qui supporte les rayons de la nageoire caudale chez la plupart des ostéichtyens. (See also: caudal fin, hypural bones, vertebral counts)
(Portuguese) Estrutura óssea composta pelos espinhos hemais e que suporta os raios da barbatana caudal na maior parte dos peixes ósseos. (See also: caudal fin, hypural bones, vertebral counts)

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