Video clips
Planorbis 1
Play video:
Planorbis spec. - The transparent egg of an aquatic snail in a gelantine string of sprawn. The motile embryo is already carrying a tiny shell through which the beating heart is visible.
Planorbis 2
Play video:
Planorbis spec. - Young animal (2 mm
size!) is "grazing" on the stalk of a waterplant.
As its shell is still transparent you can have a look at the pumping heart, the
loops of the bowels, the scratching radula, and two little black eyes at the
bottom of the horns.