Polydactyly

Polydactyly or polydactylism (from Greek πολύς (polys) 'many', and δάκτυλος (daktylos) 'finger'), also known as hyperdactyly, is an anomaly in humans and animals resulting in supernumerary fingers and/or toes. Polydactyly is the opposite of oligodactyly (fewer fingers or toes).

This article is about the congenital anomaly. For the paleontological application, see Polydactyly in early tetrapods.
Polydactyly
Other namesHyperdactyly
A left hand with postaxial polydactyly
SpecialtyMedical genetics
Usual onsetDuring pregnancy
DurationLifelong unless surgically removed
TreatmentSurgery in some cases
DeathsNone
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