protoss tribes were divisions in protoss society. Many tribes existed before or during the Aeon of Strife. During the Strife, only six tribes may have existed. Tribal affiliations were abandoned after the development of the  Khala, although their proclivities remained.
As in humans, skin color is considered a sign of ethnicity, with each protoss tribe having a specific subtly differing hue or typical pattern of markings associated with it. While the protoss are no longer a tribal society, the tribal bloodlines still run strong.
Khalai Tribes [ ]
Ara Tribe [ ]
Main article: Ara Tribe
Ara Tribe existed during the Aeon of Strife.  Khas later made it a collection of his first followers. They became the leaders of the Judicator Caste and the Conclave.
Sargas Tribe [ ]
Sargas Tribe, members of the Templar Caste, existed before the Aeon of Strife. Many members went on to become  Dark Templar. Before the Great War, it served the Conclave as enforcers.
Akilae Tribe [ ]
Akilae Tribe existed before the Aeon of Strife. It became a famous warrior tribe during the Aeon of Strife. Following the Strife, it became a Templar Caste tribe. 
Furinax Tribe [ ]
Furinax Tribe existed during the Aeon of Strife. They later became weapons crafters, the only members of the  Khalai Caste which had interest in combat.
Auriga Tribe [ ]
Auriga Tribe became Aiur's main space power. They became members of the Templar Caste.
Venatir Tribe [ ]
Venatir Tribe, much like the Sargas, tried to break free from the Khala.
Shelak Tribe [ ]
Shelak Tribe was the protoss tribe closest to the xel'naga. They continued to study xel'naga relics after the Strife. They became members of the  Judicator Caste.
Velari Tribe [ ]
This tribe fought in the
Fall of Aiur. 
Nerazim Tribes [ ]
Nerazim are split into many clans.
Boros [ ]
Boros wear heavy armor and flat helms.
Lenassa [ ]
Lenassa use "wickedly curved" warp blades and wear facial coverings.
Zer'atai [ ]
Zer'atai hunters wear zerg bones and carry energy scythes.
Lost Tribe [ ]
The Lost Tribe is an undescribed protoss tribe.
References [ ]
↑ 1.0 1.1 1.2 1.3 Golden, Christie (May 22, 2007).
Simon & Schuster (Pocket Star). StarCraft: The Dark Templar Saga #1: Firstborn. ISBN 0-7434-7125-3.
↑ Blizzard Entertainment. 2013-01-22.
StarCraft II Creative Development Q&A - Part 13. Blizzard Entertainment. Accessed 2013-01-22.
↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Underwood, Peter, Bill Roper, Chris Metzen and Jeffrey Vaughn.
StarCraft (Manual). Irvine, Calif.: Blizzard Entertainment, 1998.
BlizzHeroes Twitter. Twitter, accessed on 2018-04-012
↑ 5.0 5.1 Chris Metzen, StarCraft Legacy staff. 2009-04-03.
SC:L Metzen Interview - Lore Exclusive. StarCraft Legacy. Accessed 2009-05-18.
Vivendi Games. Mission: StarCraft. The Invasion of Aiur (in English). 1998.
Vivendi Games. Mission: StarCraft. Full Circle (in English). 1998.
↑ 8.0 8.1 8.2 8.3 Blizzard Entertainment staff. 2009-01-08.
Dark Templar Vote: Decide Which Clan Joins the Battle. Blizzard Entertainment. Accessed 2009-01-08.
↑ Blizzard Entertainment.
(Activision Blizzard) (in English). July 27, 2010 StarCraft II: Wings of Liberty.