Species
There are several species who are dominant (population) as well as who take a central role the fate of the galaxy. The rest exist, however are not large enough or simply do not take a more central role. This doesn't make them any less, they just don't 'appear' as much.
Primary Species
Akerians
Aryxian
Bek'kir
Beta Terrans
Darkarians
Dragoon
Fanatys
Faulyn
Fealyn
Fuzzballs
Hormidians
Hyperflux
Igerians
Jacindare
Jatz
Jerrusian
Mesans
Metorians
Mukosan
Nephatsu
Orrin
Sauren
Scipicants
Servittians
Terrans
Verrin
Weren
Wraiths
Other Species
Antervens
Aqiual
Arachnions
Avions
Bak'karran
Balaxians
Beltaxian
Brekka
Carnian
Carthaginian
Coronians
Datrians
Dermiuns
D'borian
Extremlings
Flaxians
Gargoyle
Grath
Grrrheet
Hangle
Jokina
Kentradentrians
Kolorian
Kordian
Krillik
Krilloan
Loraxians
Lurtens
Malon
Nairamatans
Phoenian
Pollonians
Poltern
Prismorph
Pyrran
Qien
Raviri
Rosi'Ari
Rotaran
Shanti
Skraine
Talechdonn
Tarcelli
Terverrin
THEY
Thrakh and Thrakh-Atun Nanosymbionts
Uber-Dabnn
Vertonor
Vex
Xaitan
Zamarians
Zjackians