Rukwa languages

The Rukwa languages are a group of Bantu languages established by Nurse (1988) and Fourshey (2002). They constitute half of Guthrie's Zone M, plus Bungu. The languages, or clusters, along with their Guthrie identifications, are: 
Nurse (1988) had established a more limited Mbozi ("Corridor"), without Pimbwe or Bungu, and with the addition of Rungwe tentative.
Maho (2009) adds Penja (possibly extinct), to M30, and Kulwe as closest to Fipa.