The mutation "Membrane" encompasses the following mutations: 

• WEBBED: A mutation that creates webbing along the joints of the dragons.
• FLESH: A mutation that extends the side gums further down the mouth.

Reaver's Essence and Aberrant Status

• WEBBED: Does not have any unique rules aside from allowing REAVERS ESSENCE or ABBERANT effects.
• FLESH: May extend further along the mouth, or appear as tears along the body of the dragon.