Here is a quick overview of the nine "Major Races" or my Visions of Empire setting for Classic Traveller.
In this setting, the distinction between "Minor" and "Major" Race is Reticulan Empire distinction. A "Major Race" in this setting is an intelligent species which either had a multiple-world polity when first encountered by the Reticulans (such as the Zhuzz or the Chuwak), or alternatively an intelligent species which was biologically and culturally suitable of being organized into an interstellar client-state by the Reticulan conquerors (such as the Terrans and Cicek). The Cicek needed significant technological and cultural uplifting to do that, but that was a worthwhile investment for the Reticulans who desires to use them as shock troops. A "Minor Race" on the other hand does not have an interstellar polity and has some biological and/or cultural barrier preventing it from being organized into an Imperial client-state. This is why all (or most?) "Major Races" are "air-breathers" - capable of surviving in typical Reticulan (or Terran) environments unaided or with minimal assistance - while many "Minor Races" are much more exotic biologically and/or culturally.
So here are the "Major" species:
|The United Terran Republic|
Terrans - Humanity of the future. In the 23rd century, ruled by the United Terran Republic. Before that - a Reticulan client-species.
Reticulans - female-only rationalist/technocratic "Greys" who reproduce by parthenogenesis. Physically weak, in heavy work and combat they use robots and/or "client" alien species. Society is organized into castes. In the past they were one of the Precursor species.
|Sselassians (CMG Astagar Fighters)|
Sselassians - highly religious "snakemen", with a humanoid upper body and a "snake leg" underneath. The dominant faith creates multiple assassin-cults. Quite ritualistic and atavistic. Reticulan client-species mostly used as assassins and special-forces troops.
|Fanja-Fanja - Khurasan Felids|
Fanja-Kanja - individualistic, highly curious "felinoids". NOT a warrior species; egg-laying. Highly interested in trade and exploration, as well as scietific research. Reticulan client-species mostly used as researchers and ship crewmembers.
|Phnunk (15mm.co.uk Octopods)|
Phnunk - "Humanoids" with tentacled faces used for eating and manipulating objects; also have claws in their hands for further manipulation. Society is quite egalitarian and creative work is valued above everything else. Biologically related to fungi and reproduce by spores. High technical aptituide. Reticulan client-species mostly used as technicians.
|Klax (GZG Crusties)|
Klax - "Insectoids" but much more similar to crustaceans; bear live young but lack sexes. Society is tribal and highly competitive between tribes. Quite aggressive in outlook. Reticulan client-species mostly used as shock-troops and snipers.
|Chuwak (LNG Chuhuac)|
Chuwak - Possibly descended from Terran theropod stock imported to various Garden Worlds by the hypotehtical Gardeners approximately 70 million years ago. Feathered pack-oriented predatory "dinosauroids". Aggressive and proud. Reticulan client-species mostly used as front-line troops. In the past they were one of the Precursor species but were heavily hit by the fall of the Precursors and regressed even more than the reticulans.
|Zhuzz (Spriggan Miniatures Spug)|
Zhuzz - Opportunistic "insectoids" who evolved on the homeworld of a dead Precursor species. Evolved quite quickly due to easy access to relic technology. Highly interested in trade, but not always trustworthy and not above piracy, fraud and outright raiding. Reticulan client-species as ship crews and technicians.
|Cicek (Stan Johanssen Draco)|
Cicek - Anarchic tribal "Reptilod" warriors. Males are highly competitive, females are quite cooperative, but both are usually loyal to their tribe (and little else). Until recently a Reticulan client-species; now mostly liberated and organized into the (very loose) Cicek Confederation (which is allied with the UTR).