preural 1 vertebra Last caudal vertebra identified as the point at which the caudal vessels bifurcate, leaving the protection of the haemal arches of the caudal vertebrae and running laterally to the hypurals. This vertebra bears, commonly, a well-developed haemal arch and its spine (parhypural). TAO:0000557 The haemal arch may be fused to the centrum or not. In contrast, the neural arch and spine may be well developed, or rudimentary or absent in different teleost subgroups. penultimate vertebra preural centrum 1 pu1 second last vertebra teleost_anatomy preural vertebra