What is any species of serpentiform lizards of the family Pygopodidæ, which have rudimentary hind legs near the anal cleft, but lack fore legs called?

pygopod — (Zoöl.) Any species of serpentiform lizards of the family Pygopodidæ, which have rudimentary hind legs near the anal cleft, but lack fore legs. (Webster's 1913.)

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