Biologic evolution

The role of the stalk of Midoriigai was written last time.
The photograph above sees a white part the stalk of Midoriigai ahead.
The photograph below is Tait of Midoriigai. I think that the shape of the point having stuck on the glass side is corresponding to the part where the stalk is white.
This photograph is a thing used before.
There is a part where Tait gathers in the root of the stalk.

The doubt has boiled.
Does Tait start from the stalk?
Or, do you start from foot string set part in the shell?
It was slow to notice this.
It did not take a picture by thinking which ahead.

Maybe, it was thought that the role of taking the place of the putting
sucker was done, the shell was turned to the surface of the water, and
a previous part of Tait had been left for the glass side the stalk
ahead.
The act of putting the string only by doing taking the place of the
sucker might not have been done.
It is thought that the action that put the string was done after the
body besides the surface of the water is moved.
The first part of the string is put from the stalk on the glass side,
the string is pulled in the shell while putting the string from the
stalk, and I think that it bonded the string to the set part of Tait.
This is an imagination to the end.
The opposite might exist, too.
It was not confirmed.