>   The problem that still remains is the question of an up to date book.
> Thiele was writen between 1929 to 1935.  Many new genera, subfamilies, and
> families have been described since then.
Well at suprageneric level, Mollusca : The Southern Synthesis is as good as
it gets. Not much help with placing genera, though. With the number of
genera now in circulation, I suspect even placing them in families would be
too great a task for one person or team to tackle now.