Adaptation and Appearance
Punctum minutissimum is very small in size with a shell
between 1.1 and 1.3 mm in diameter. Its eyes are less than .02
mm accross (Serb, 2008). It is very pale brown and slightly
transluscent in color. P. Minutissimum has 3.5 to 4.5 whirls
with a radial striae running along the shell. Striae are thin
grooves or channels that run parallel to each other along the
shell. The umbilicus (the cone shaped hole left between the
whirls on the under side of the shell) is almost 25% of the
width of the shell.
Follow this link to watch how P. minutissimum moves.