Flexibilia is a superorder of specialized Paleozoic (Middle Ordovician to Permian) crinoids.

They exhibited a conserved body plan and consistent suite of characteristics throughout their long history.

Previously considered a subclass with unclear affinities, later investigation determined that flexibles are well-nested within Cladida, a broad group ancestral to living articulate crinoids.

[1] The Ordovician cladid Cupulocrinus acts as an intermediate form linking the generalized anatomy of other early cladids with the distinctive anatomy of flexibles, and several studies have considered it to be ancestral to the rest of the group.

The most recent discussion of Flexibilia taxonomy considers Taxocrinida to be paraphyletic and ancestral to Sagenocrinida.