Monday, August 29, 2011
Being air breathers, these giant snails don't wander into deep water. Each snail must periodically climb up to break the surface with the edge of its mantle curled into a tube, to freshen the air in the large space inside its shell. On these snails I see two mantle flaps, one on each side of the head - but only the one on the right side forms a breathing tube, translucent and delicate like a little mushroom. The other is a simple flap of skin that may function as a gill.