Originally posted by robject:
ERhm. Are there any aliens to be excluded, then?
Part of the problem is that Proto-Traveller is a subset of the OTU, so it therefore needs to contain at least a decent subset of the OTU's aliens.
Since it appears that people want to preserve the key features of the Spinward Marches and Solomani Rim, that means that the Droyne/Chirpers, the Zhodani, the Sword Worlders, the Darrians and the Vargr are necessary, as are, arguably, the Aslan. The other aliens from the Marches are expendable. From the Rim, we need the Vegans, while, of course, preserving the original Solomani/Vilani stuff. We also definitely need the Aslan here, if only for the Dark Nebula component of the setting.
These are the only "mandatory" aliens. The rest are flavour.
I like, and would therefore use, the Virushi, Miniphants and Dolphins. I would probably also use the Newts and Dandies. I'm rather indifferent to the K'kree and Hivers (and their various associated species), but it's guaranteed that other people will want to use them.
To put it simply, the only species that can really be excluded are the more obscure ones, and even they are going to pop up in many Referee's games. But, of course, that's fine, because Proto-Traveller is a homebrew by definition.
Of course, since we will are shrinking the Imperium, we are squeezing the amount of room for minor alien species, but there are still plenty of options.
And, after all, we don't have a "official" Proto-Traveller map of the entire Imperium, so there is always scope for adding new stuff.