Pseudoceros albicornis | 1857 or earlier | | | Yesso Island, Hokkaido, Japan |
Pseudoceros japonicus | 1857 or earlier | | | Yesso Island, Hokkaido, Japan. |
Proschizorhynchella caudociliata | 2018 or earlier | | sandy | "based on the material collected from sandy intertidal zones around Hokkaido, Northern Japan." |
Mesostoma lingua | 1953 or earlier | | | |
Phagocata albata | 1962 or earlier | | | |
Phagocata iwamai | 1962 or earlier | | | |
Polycelis akkeshi | 1962 or earlier | | | |
Phagocata tenella | 1962 or earlier | | | |
Polycelis schmidti | 1969 or earlier | | | Middle and South Hokkaaidô (including Rishiri Island). |
Polycelis akkeshi | 1969 or earlier | | | Middle, East and North Hokkaidô |
Proschizorhynchella magnoliae | 2018 or earlier | | sandy | "based on the material collected from sandy intertidal zones around Hokkaido, Northern Japan." |
Proschizorhynchella shibazakii | 2018 or earlier | | sandy | "based on the material collected from sandy intertidal zones around Hokkaido, Northern Japan." |
Proschizorhynchella shuttlecock | 2018 or earlier | | sandy | "based on the material collected from sandy intertidal zones around Hokkaido, Northern Japan." |
Freddius tricaudatus | 2018 or earlier | | sandy | "based on the material collected from sandy intertidal zones around Hokkaido, Northern Japan." |