syndactyly

syndaktylia puhekieltä The normal condition, in some animals and birds, of having fused digits.
The anomalous condition, in humans, of having some fingers or toes fused with a web.
2008, Guinness World Records — Human Body — Extreme Bodies — http://www.guinnessworldrecords.com/records/human_body/extreme_bodies/most_fingers_and_toes_-_living_person.aspx Most Fingers and Toes — Living Person

Pranamya Menaria (India; born August 10, 2005) has 25 in total (12 fingers and 13 toes). This is as a result of the condition Polydactyly and Syndactyly.