OBO_REL:part_of (UNDECLARED) anatomical cluster upper hypural set Anatomical cluster including hypural 3 and more dorsal hypurals that supports the dorsal series of principal caudal lepidotrichia or rays. The upper hypural set articulates or fuses to ural centra 3, 4 or 5 (polyural terminology) or ural centrum 2 (diural terminology) depending on the teleost subgroup. The upper hypural set is composed of unpaired median bones. TAO:0002067 The number of hypurals included in the upper hypural set differs among teleostean subgroups. In basal teleosts this may include hypurals 3 to 9 or 10, whereas in more advanced groups this many include hypurals 3 to 5 or even less. teleost_anatomy upper hypurals caudal fin skeleton