 Various forms of postaxial (ie. not on the big toe)&amp;nbsp;Type A polydactyly of the foot, ranging from a partially duplicated fifth intermediate phalanx (top left) to a fully developed sixth digit, including the metatarsal (bottom right). From Case DT. Hill RJ. Merbs CF. Fong M.&amp;nbsp;Polydactyly in the Prehistoric American Southwest.&amp;nbsp;&amp;nbsp;  Journal of Osteoarchaeology   2006:&amp;nbsp;6: 221–235. 