Re: Vaitulyakas

There is an enormous scholarly literature on the Kv.  Some of the
ancient schools can be identified, others rely on inferences from the
(much later) commentary, and some are completely mysterious or lost to
history.

A personal favourite would be the "Gokulikas" who maintained that "all
is just a heap of hot ashes".

If you have access to a major university library, you can start
working through the western scholarly articles on the Kv; however, if
you're at a more typical monastery, you probably won't be able to find
any information on the Kv besides the commentary.  Many major
textbooks on the history of early Buddhism attempt to draw up
pseudo-historical tables as to how these schools were inter-related
--but this sort of thing is highly conjectural.

E.M.