[Type] IIB [Characteristics[18]] Thumb web space severely narrowed [Description[17][18]] 
Severely narrowed web
N o r m a l w e b
M i l d l y n a r r o w e d w e b
S e v e r e l y n a r r o w e d w e b
S y n d a c t y l i z e d w e b
M e r g e d w e b
A b s e n t w e b