Cover image: Oligodactyly as a result of ectrodactyly on the feet of a one-year-old child | Aurélie & Sylvain Mulard - Self-photographed, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=3943878
Presence of fewer than five fingers or toes on a hand or foot.
- Ectrodactyly or Split hand/split foot malformation (SHFM)
- Extreme instance of oligodactyly, involving the absence of one or more central digits of the hand or foot.