Amto–Musan languages

Amto–Musan is a language family of two closely related but mutually unintelligible Papuan languages, Amto and Siawi, spoken along the Samaia River of Sandaun Province of Papua New Guinea.

Languages

and Usher agree that the family consists of two languages.
;Amto–Musan / Samaia River family

External relationships

Amto–Musan was left unclassified by Ross due to lack of data; Wurm had posited it as an independent family. The family has typological similarities with the Busa language isolate, but these do not appear to demonstrate a genetic relationship.
Timothy Usher links the Amto–Musan languages to their neighbors, the Arai languages and the Pyu language in as Arai–Samaia stock.
Foley classifies them separately as an independent language family. Foley also notes that due to heavy contact and trade with Left May languages, Amto–Musan languages have borrowed much cultural vocabulary from Left May.

Cognates

Amto-Musan family cognates listed by Foley :
Possible cognates between the Amto-Musan and Left May families:
Possible loanwords reflecting the close trade relationship between Amto-Musan and Left May speakers:

‘arrow’ Amto lamu, Musan namu, Ama lamu
‘stone’: Amto tabeki, Musan tipeki, Bo təpəki, Ama ''tomoki''

Vocabulary comparison

The following basic vocabulary words are from Conrad & Dye, as cited in the Trans-New Guinea database:
The words cited constitute translation equivalents, whether they are cognate or not.