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Henry Threadgill’s “2.6 Pentadactyl,” commissioned by the Kennedy Center and University of Chicago and written for Imani, had its Washington premiere.

Laced with opportunities for individual improvisation, “2.6 Pentadactyl” veered between unanimity of movement and a circling constellation of sound and color, creating an aural feast.

And structures such as the pentadactyl limb still follow an ancient body plan that ensures that no living vertebrate has more than five digits.

Our arms and legs are pentadactyl limbs - they have five digits.

A fundamental constraint prevents limbless subterranean animals from remaining viable above a body size of a metre or so, and Graboidus and other large amphisbaenians have seemingly re-evolved giant, pentadactyl clawed forelimbs for use in locomotion and prey dismemberment. is parthenogenetic and viviparous.