Pseudolividae was previously regarded as a subfamily of the Olividae,
but was recently elevated to family level on anatomical characters.
The family has undergone a decline in diversity and geographical
range over geological time, having originated in the Late Cretaceous and
peaked in diversity in the Paleocene. There are now
about 100 living species in 14 genera.
There are only two living species in Australian waters, both in
the genus Zemira, but several
fossil species have been named. The
living species occur subtidally, down to about 150 metres in NSW and down to
350 metres in
Identification Notes: Pseudolivid shells are characterised by a spiral groove on the lower half of the body whorl, a small spike on the outer lip at the end of the groove, spiral grooves over the whole surface, and a simple outer lip.