P. olivacea Axials absent on at least
first whorl. Spiral groove below suture making row of nodules.
P. albizona Either smooth or axially
ribbed. White band below suture.
P. frauenfeldi Large for genus (3.7
mm), axials on all whorls, usually white spiral band on middle of
P. salebrosa The widest species in the
genus; strong oblique ribs with a depression around middle of
P. kershawi Close-set axials on all
whorls, sometimes weak on first whorl. Like P. olivacea but
no spiral groove below suture.
P. castella Three spiral rows of strong
P. oblata Very fine oblique axials on
tumida Similar to P. olivacea but stronger axials and
colour bands. Very rare in NSW.
P. approxima Small, translucent
P. vincula Usually with 1-2 spiral
cords and angled periphery on last whorl, but sometimes smooth and
then very similar to P. approxima.