Historical Rules · 1 February 2010
Rule 308.2
Official source text from the 1 February 2010 Rules release
Tribal subtypes are always a single word and are listed after a long dash: "Tribal Enchantment -- Merfolk." The set of tribal subtypes is the same as the set of creature subtypes; these subtypes are called creature types. Tribals may have multiple subtypes. See rule 204.3k for the complete list of creature types.