Stellaris 4.5.2 authorities
Stellaris 4.5.2 has 8 government authorities in its files; 7 can be picked by players: Democratic, Oligarchic, Dictatorial, Imperial, Hive Mind, Machine Intelligence, Corporate. The authority sets how rulers are chosen and which civics are open.
Authorities players can pick
Democratic5 civics need itNot for Gestalt Consciousness, Authoritarian, Fanatic Authoritarian+10% Faction Approval+1 Recruitable Leaders per Class
Oligarchic6 civics need itNot for Gestalt Consciousness, Fanatic Egalitarian, Fanatic Authoritarian+2 Effective Councilor Skill
Dictatorial3 civics need itNot for Gestalt Consciousness, Egalitarian, Fanatic Egalitarian+25% Ruler Experience Gain-1 Recruitable Leaders per Class
Imperial5 civics need itNot for Gestalt Consciousness, Egalitarian, Fanatic Egalitarian-1 Recruitable Leaders per Class
Hive Mind41 civics need itNeeds Gestalt Consciousness+25% Pop Growth Speed-25% Empire Size Effect
Machine Intelligence43 civics need itNeeds Gestalt Consciousness+1 Urban Districts when establishing Colonies+25% Colony Development Speed
Corporate57 civics need itNot for Gestalt Consciousness, Fanatic Egalitarian, Fanatic Authoritarian+10% Trade Trade from Jobs+10% Nomadic Contract Trade RewardNot for players
Source: common/governments/authorities, Stellaris Cygnus v4.5.2 (9776).