Tindale (1940) groups Wanjiwalku & Karenggapa together with Wadikali & Maljangapa as the only languages in NSW that are behind the 'Rite of Circumcision' border - which suggests Wanjiwalku to also be part of the Yarli area.
Classification
The three varieties are very close. Hercus & Austin (2004) classify them as the Yarli branch of the Pama–Nyungan family. Dixon (2002) regards the three as dialects of a single language. Bowern (2002) excludes them from the Karnic languages, where they had sometimes been classified.
Phonology
The following are the sounds in the Malyangapa dialect:
12O’Grady, Geoffrey N.; Voegelin, C. F.; F. M., Voegelin (1966). Languages of the World: Indo-Pacific Fascicle Six. Anthropological Linguistics 8, no. 2. p.64.