In Tasmania, this genus includes 16 species, as follows:
Cystiscus alternans (alternating margin-shell)
Cystiscus angasi (Angas’ margin-shell)
Cystiscus bucca (cheek margin-shell)
Cystiscus connectans (connecting margin-shell)
Cystiscus cratericulus (crater margin-shell)
Cystiscus cymbalum (cymbal margin-shell)
Cystiscus flindersi (Flinders’ margin-shell)
Cystiscus freycineti (Freycinet’s margin-shell)
Cystiscus halli (Hall’s margin-shell)
Cystiscus incertus (uncertain margin-shell)
Cystiscus indiscretus (indiscrete margin-shell)
Cystiscus minutissimus (least margin-shell)
Cystiscus obesulus (fat margin-shell)
Cystiscus subauriculatus (eared margin-shell)
Cystiscus thouinensis (Cape Thouin margin-shell)
Cystiscus tomlinianus (Tomlinian margin-shell)