The second and third fingers display a proliferation of the finger members, a so-called hyperphalangy.
2.
The toe phalanges also show hyperphalangy; exceptionally, " Ophthalmosaurus " shows a reduced number of phalanges.
3.
Infants with Catel Manzke syndrome have an extra ( supernumerary ), irregularly shaped bone known as a Hyperphalangy located between the first bone of the index finger ( proximal phalanx ) and the corresponding bone within the body of the hand ( second metacarpal ).
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