Ectrodactyly, sometimes referred to as the “lobster-claw syndrome” involves the deficiency or absence of one or more central digits of the hand or foot and is also known as split hand/split foot malformation (SHFM).The hands and feet of people with ectrodactyly are often described as “claw-like” and may include only the thumb and one finger (usually either the little finger, ring finger, or a syndactyly of the two) with similar abnormalities of the feet. (from wikipedia)

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A large number of human gene defects can cause ectrodactyly. The most common mode of inheritance is autosomal dominant with reduced penetrance  

ABC news link

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