It's time to consider the Arcellinida shell as a weapon https://www.isep-protists.com/post/arcellinida-shell-weapon
"why is there such a large morphological diversity in shell-bearing #amoebae and what is the function of shells anyway? We knew for a long time that #Arcellinida are masters of the #cytoskeleton as they use it to build their elaborate shells. It was unknown that they use both, the cytoskeleton and shell, in combination to function as small apex #predators in their systems."
