Subspecies
Subspecies of Placostylus bivaricosus include:
- Placostylus bivaricosus bivaricosus (Gaskoin, 1855)
- Placostylus bivaricosus etheridgei (Hedley, 1891) - extinct
- Placostylus bivaricosus cuniculinsulae (Cox, 1872)
- Placostylus bivaricosus solidus (Brazier in Etheridge, 1889)
Read more about this topic: Lord Howe Flax Snail