Board Thread:Wiki Discussion/@comment-32744161-20180430064434/@comment-47205-20180430080927

This would be similar to how Monera was originally structured. However, it lumps completely dissimilar cells into the same family based purely on their mouthparts, while otherwise-identical cells could be in entirely different families purely because one has a jaw and the other has a jaw plus a filter mouth.

I suggest a better option would be to come up with better family descriptions. Oozlebachridae, for example, already contains carnivores and ciliated creatures, so the situation you describe isn't merely hypothetical: there are carnivores that aren't in Carnitoria, and there are ciliated cells that aren't in Ciliophora.

We might, for example, redefine Carnitoria as "simple carnivorous cells without cilia", and Ciliophora as "cells with cilia and without front-facing spikes".