A distal finger or toe and its corresponding skeletal organization. Positional assignment, morphology and developmental identity must be distinguished when comparing reduced hands.
The morphological and developmental character identity assigned to a anatomical digit. It is not necessarily equivalent to its ordinal position among the surviving anatomical digits of a reduced limb.
Developmental assignment of position-associated anatomical and molecular character to a digit. A change in digit number or growth is not automatically a homeotic change of identity.
A condition with additional anatomical digits relative to the relevant standard pattern. In early digit-bearing vertebrates, counts above five show that the modern pentadactyl ground plan cannot simply be projected onto the earliest limbs.
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