'''Yammostuwiwagaiya''' (YamYäm-mos tu-wi-wa-gai-ya) /= big plains/, banda [[Mono]] (Hodge) Indijanaca, odnosno [[Sjeverni Pajuti|Sjevernih Pajuta]] (Swanton) nekad naseljena u u [[Paradise Valley]]u, na zapadu američke države [[Nevada]]<ref>[http://booksarchive.google.comorg/books?id=2h8HAtCWsIAC&pg=PA987&lpg=PA987&dq=Yammostuwiwagaiya&source=bl&ots=qswFXcJuGv&sig=MpBdRDSltX3ctXBFSzBJySwP5LE&hl=en&ei=9A1DTPOAH4aPOK6uoZYN&sa=X&oi=book_result&ct=result&resnum=5&ved=0CCcQ6AEwBAstream/handbookamindians01hodgrich#v=onepage&q=Yammostuwiwagaiya&f=falsepage/987/mode/1up Hodge]</ref> u okrugu [[okrug Humboldt, Nevada|Humboldt]].
Spominju ih Powell (1881) i Powers (1876). Kod jednog autora javlja se naziv Atsakudökwatuviwarai koje locira u istu dolinu<ref>[http://wontolla.homepage.t-online.de/wontolla/14e-uto.html Wontolla's Reservation]</ref>.
