2 Mariana Islands species out of 8 reported
Ilbia mariana
Metaruncina setoensis
Additional Runcinidae species reported from the Mariana Islands by Carlson and Hoff (2003):
- Lapinura sp. 1, spotted, exposed shell
- Lapinura sp. 2, green, exposed shell
- runcinid sp. 1, brown fr. Schizothrix
- runcinid sp. 2, brown w/white flecks
- runcinid sp. 3, brown
- runcinid sp. 4, striped