Pseudostylochus takeshitai Yeri & Kaburaki, 1918 | Jun 1938 | | | |
Prosthiostomum auratum Kato, 1937 | 1938 or earlier | | | |
Stylochus aomori Kato, 1937 | 1944 or earlier | | | Asadokoro near Asamusi, Mutsu. Found creeping on the muddy beach. |
Stylochoplana pusilla Bock, 1924 | 1944 or earlier | | | commonly found in the mantle cavity of Monodonta labio Linné, and rarely of Tegula exanthostigma (A. Adams), Thais tumulosa clavigera (Küster). In Asamusi, the animal very often found also in the common limpet, Cellana Toreuma Reeve. |
Planocera reticulata (Stimpson, 1855) | 1944 or earlier | | | |
Planocera multitentaculata Kato, 1940 | 1944 or earlier | | | Usually found together with Planocera reticulata. |
Pseudostylochus intermedius Kato, 1939 | 1944 or earlier | | | |
Cycloporus japonicus Kato, 1944 | 1944 or earlier | | | Asamusi, Mutsu. commonly found on compound ascidians. |