Zospeum tholussum
... that the microscopic cave snail Zospeum tholussum is so slow that in a week's time it may only move a few millimeters or centimeters in circles?
... that the microscopic cave snail <i id="mwA74"><b id="mwA78"><a href="./Zospeum_tholussum" id="mwA8A" rel="mw:WikiLink" title="Zospeum tholussum">Zospeum tholussum</a></b></i> <i id="mwA8E">(pictured)</i> is so slow that in a week's time it may only move a few millimeters or centimeters in circles?