All but two of the starred languages below (Yélî Dnye and Sulka) make a gender distinction in their pronouns. Several of the heavily Papuanized Austronesian languages of New Britain do as well. This suggests a pre-Austronesian language area in the region.
The East Papuan languages were identified as a phylum by linguist Stephen Wurm (1975) and others. However, their work was preliminary, and there is little evidence the East Papuan languages actually have a genealogical relationship. For example, none of the fifteen languages marked with asterisks below share more than 2-3% of their basic vocabulary with any of the others ('basic vocabulary' being words for basic things like fire, water, eye, or louse that are not likely to be borrowed from neighboring languages). Dunn et al. (2005) tested the reliability of the proposed 2-3% cognates by randomizing the vocabulary lists and comparing them again. The nonsense comparisons produced the same 2-3% of "shared" vocabulary, demonstrating that the proposed cognates of the East Papuan languages, and even of proposed families within the East Papuan languages, are as likely to be due to chance as to any genealogical relationship. Thus in a conservative classification, many of the East Papuan languages would be considered language isolates.
Given that the islands in question have been settled for at least 35 000 years, it's not surprising that they show considerable linguistic diversity. However, Malcolm Ross (2001; 2005) has presented evidence from comparing pronouns from nineteen of these languages that several of the lower-level branches of East Papuan may indeed be valid families. This is the classification adopted here. For Wurm's more inclusive classification, see the Ethnologue entry here
Reconstructed pronoun sets for each of the families are given in the individual articles.
? Yele-West New Britain family [tentative]
Baining (East New Britain) family: Mali*, Qaqet, Kairak, Simbali, Taulil**, Butam (extinct)**, Ura, Malkolkol
North Bougainville family — Bougainville
South Bougainville family — Bougainville
Central Solomons family
* Dunn et al. found no demonstrable shared vocabulary between these fifteen languages.
** Ross considered these four languages in addition to the fifteen studied by Dunn et al.
Sulka isolate* - New Britain (poor data quality; the possibility remains that Sulka will be shown to be related to Kol or Baining)
Kol isolate* - New Britain
Kuot (Panaras) isolate* - New Ireland
* Dunn et al. found no demonstrable shared vocabulary between these fifteen languages.
Similarly, Wurm had classified the extinct Kazukuru language and its possible sister languages of New Georgia as a sixth branch of East Papuan. However, in a joint 2007 paper, Dunn and Ross argued that this was also Austronesian.