Views of palmar surfaces of male of <i><a href="//commons.wikimedia.org/wiki/Anodonthyla_jeanbai" title="Anodonthyla jeanbai">Anodonthyla jeanbai</a></i> frog, showing detail of first finger and prepollex.
Miguel Vences et al.
CC BY 3.0
<a rel="nofollow" class="external free" href="http://dpc.uba.uva.nl/ctz/vol79/nr01/art01">http://dpc.uba.uva.nl/ctz/vol79/nr01/art01</a>