Austronesian languages
Primary branches on Taiwan (Formosan languages)

In addition to Malayo-Polynesian, thirteen Formosan subgroups are broadly accepted. The seminal article in the classification of Formosan—and, by extension, the top-level structure of Austronesian—is Blust (1999). Prominent Formosanists (linguists who specialize in Formosan languages) take issue with some of its details, but it remains the point of reference for current linguistic analyses. Debate centers primarily around the relationships between these families. Of the classifications presented here, Blust (1999) links two families into a Western Plains group, two more in a Northwestern Formosan group, and three into an Eastern Formosan group, while Li (2008) also links five families into a Northern Formosan group. Harvey (1982), Chang (2006) and Ross (2012) split Tsouic, and Blust (2013) agrees the group is probably not valid.

Other studies have presented phonological evidence for a reduced Paiwanic family of Paiwanic, Puyuma, Bunun, Amis, and Malayo-Polynesian, but this is not reflected in vocabulary. The Eastern Formosan peoples Basay, Kavalan, and Amis share a homeland motif that has them coming originally from an island called Sinasay or Sanasay. The Amis, in particular, maintain that they came from the east, and were treated by the Puyuma, amongst whom they settled, as a subservient group.
language:response_language[Latin]