Where the category "fish" isn't a clade - it's possible to evolve to no longer be a fish - it's more comparable to a specific generation of ARM chips, like perhaps ARM32, than it is to the ARM line in general. It would be weird to say "64-bit ARMv5" in the same way that it would be weird to say "lactating fish". But it is not weird to say "64-bit ARM" for the same reason it isn't weird to say "lactating euteleostome."

You guys are going to have to eat these words when fishermen off the coast of Madagascar pull up an example of Pisces lactatus.

Is that the scientific designation of mermaid fantasies of lonely fishermen?

I appreciate that you used my bad joke as a fact-checking opportunity to spread some scientific knowledge :)

We take our analogies very seriously here, no jokes sir.

While this is a better analogy and worth reading, "fish" is funnier.