| Apidioplana okadai Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | 287-288, Pl. XXIX, figs. 5, 6; Text-figs. 31, 32 |
| Apidioplana okadai Kato, 1944 | | - | primary taxonomic authority (describer) | 287-288, Pl. XXIX, figs. 5, 6; Text-figs. 31, 32 |
| Pseudostylochus notoensis Kato, 1944 | | - | primary taxonomic authority (describer) | 291-292, Text-figs. 34, 35 |
| Pseudostylochus sadoensis Kato, 1944 | | - | primary taxonomic authority (describer) | 292-293, Pl. XXVII, fig. 2; Text-figs. 36, 37 |
| Hoploplana rubra Kato, 1944 | | - | primary taxonomic authority (describer) | 281-282, Text-figs. 24 25 |
| Hoploplana schizoparellae Kato, 1944 | | w | primary taxonomic authority (describer) | 280-281, Pl. XXVII, fig. 4; Text-figs. 22, 23 |
| Stylochoplana aberrans Kato, 1944 | | - | primary taxonomic authority (describer) | 274-276, Pl. XXVII, figs. 5-7; Text-figs. 17-19 |
| Zygantroplana elepeasta Kato, 1944 | | w | primary taxonomic authority (describer) | |
| Planocera heda Kato, 1944 | | - | primary taxonomic authority (describer) | 285-286, Text-figs. 29, 30 |
| Cryptocelidinae Amemiyaia Kato, 1944 | | - | primary taxonomic authority (describer) | 271 |
| Amemiyaia pacifica Kato, 1944 | | - | primary taxonomic authority (describer) | 271-273, Pl. XXVI, figs. 4-6; Text-figs. 14-16 |
| Taenioplaninae Ilyplanoides Kato, 1944 | | - | primary taxonomic authority (describer) | 268 |
| Ilyplanoides mitsuii Kato, 1944 | | w | primary taxonomic authority (describer) | 269-271, Pl. XXVI, fig. 7; Text-figs. 11-13 |
| Discocelis fulva (Kato, 1944) | | - | primary taxonomic authority (describer) | 260-261, Text-figs. 1,2 |
| Cryptophallus japonicus Kato, 1944 | | w | primary taxonomic authority (describer) | |
| Stylochus hamanensis Kato, 1944 | | w | primary taxonomic authority (describer) | 263-264, Text-figs 5, 6 |
| Stylochus izuensis Kato, 1944 | | w | primary taxonomic authority (describer) | 265-266, Text-figs. 9, 10 |
| Stylochus miyadii Kato, 1944 | | w | primary taxonomic authority (describer) | 264-265, Pl. XXVI, fig. 1; Text-figs. 7,8 |
| Stylochus uniporus Kato, 1944 | | w | primary taxonomic authority (describer) | 262-263, Text-figs. 3, 4 |
| Cycloporus japonicus Kato, 1944 | | - | primary taxonomic authority (describer) | 305 |
| Stylostomum maculatum Kato, 1944 | | w | primary taxonomic authority (describer) | 305-306, Pl. XXVII, fig. 3; Text-figs. 49, 50 |
| Prosthiostomum komaii Kato, 1944 | | - | primary taxonomic authority (describer) | 311-312, Pl. XXVI, figs. 2, 3; Text-figs. 59, 60 |
| Prosthiostomum notoensis Kato, 1944 | | - | primary taxonomic authority (describer) | 310, Text-figs. 55, 56 |
| Prosthiostomum nozakensis Kato, 1944 | | - | primary taxonomic authority (describer) | |
| Prosthiostomum sadoensis Kato, 1944 | | - | primary taxonomic authority (describer) | 309, Text-figs. 51-52 |
| Prosthiostomum suzakiensis Kato, 1944 | | - | primary taxonomic authority (describer) | 312-313, Text-figs. 61, 62 |
| Prosthiostomum wagurenisis Kato, 1944 | | w | primary taxonomic authority (describer) | 309-310, Pl. XXIX, fig. 1; Text-figs. 53, 54 |
| Pseudoceros izuensis Kato, 1944 | | - | primary taxonomic authority (describer) | 301-302, Text-figs. 45, 46 |
| Pseudoceros nipponicus Kato, 1944 | | - | primary taxonomic authority (describer) | 300-301, Text-fig. 44 |
| Pseudobiceros izuensis (Kato, 1944) | | - | primary taxonomic authority (describer) | |
| Thysanozoon japonicum Kato, 1944 | | - | primary taxonomic authority (describer) | 297, Text-figs. 42, 43 |
| Discocelis fulva Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Ilyplana mitsui (Kato, 1944) | | w | primary taxonomic authority (describer) | |
| Ilyplanidae Ilyplanoides Kato, 1944 | | w | primary taxonomic authority (describer) | |
| Ilyplanoides mitsui Kato, 1944 | | w | primary taxonomic authority (describer) | |
| Zygantroplana clepeasta Kato, 1944 | | w | primary taxonomic authority (describer) | 278-280, pl. XXVII, fig. 1; Text-figs. 20, 21 |
| Zygantrum clepeastum (Kato, 1944) | [with synonyms] | w | primary taxonomic authority (describer) | |
| Hoploplana rubra Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Hoploplana schizoporellae Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Cryptocelidinae Amemiyaia Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Amemiyaia pacifica Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | 271-273, Pl. XXVI, figs. 4-6; Text-figs. 14-16 |
| Stylochoplana aberrans Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Koinostylochus notoensis (Kato, 1944) | [with synonyms] | w | primary taxonomic authority (describer) | |
| Planocera heda Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Planocera multitentaculata Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Pseudostylochus notoensis Kato, 1944 | | w | primary taxonomic authority (describer) | |
| Pseudostylochus sadoensis Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Stylochus hamanensis Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Stylochus izuensis Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Stylochus miyadii Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Stylochus uniporus Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | 538 |
| Cycloporus japonicus Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Parastylostomum maculatum (Kato, 1944) | [with synonyms] | w | primary taxonomic authority (describer) | |
| Stylostomum maculatun Kato, 1944 | | w | primary taxonomic authority (describer) | |
| Prosthiostomum komaii Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Prosthiostomum notoensis Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Prosthiostomum nozakensis Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Prosthiostomum sadoensis Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Prosthiostomum suzakiensis Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Prosthiostomum wagurensis Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Pseudoceros izuensis (Kato, 1944) | | w | primary taxonomic authority (describer) | |
| Pseudoceros nipponicus Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Pseudobiceros izuensis (Kato, 1944) | [with synonyms] | w | primary taxonomic authority (describer) | |
| Thysanozoon japonicum Kato, 1944 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Pseudobiceros gratus (Kato, 1937) | | w | other taxonomic work | 300 |
| Planocera multitentaculata Kato, 1940 | | - | other taxonomic work | |
| Notoplana humilis (Stimpson, 1857) | | - | other taxonomic work | 276 |
| Leptoplana oblonga Stimpson, 1857 | | - | other taxonomic work | 276 |
| Notoplana delicata (Yeri & Kaburaki, 1918) | | - | other taxonomic work | 276 |
| Notoplana koreana Kato, 1937 | | - | other research on this sp. | |
| Notoplana septentrionalis Kato, 1937 | | - | other research on this sp. | |
| Notoplana libera Kato, 1939 | | - | other research on this sp. | |
| Notoplana sophia Kato, 1939 | | - | other research on this sp. | |
| Discoplana takewakii Kato, 1935 | | - | other taxonomic work | |
| Hoploplana villosa (Lang, 1884) | | - | other taxonomic work | 280 |
| Hoploplana cupida Kato, 1938 | | - | other research on this sp. | |
| Hoploplana deanna Kato, 1939 | | - | other research on this sp. | |
| Planocera pellucida (Mertens, 1832) | | - | other taxonomic work | 282-283 |
| Planocera reticulata (Stimpson, 1855) | | - | other taxonomic work | 283, Pl. XXVIII, figs. 6, 7; Text-fig. 26 |
| Planocera purpurea Yeri & Kaburaki, 1918 | | - | other taxonomic work | 283-284, Text-fig. 27 |
| Planocera profunda Kato, 1937 | | - | other taxonomic work | 284 |
| Paraplanocera oligoglena (Schmarda, 1859) | | - | other taxonomic work | 286 |
| Paraplanocera rubrifasciata Kato, 1937 | | - | other taxonomic work | 286-287 |
| Neoplanocera elongata Yeri & Kaburaki, 1918 | | - | other taxonomic work | 287 |
| Callioplana marginata Stimpson, 1857 | | - | other taxonomic work | 288-289 |
| Pseudostylochus obscurus (Stimpson, 1857) | | - | other research on this sp. | 289 |
| Pseudostylochus takeshitai Yeri & Kaburaki, 1918 | | - | other taxonomic work | 290 |
| Pseudostylochus fulvus Yeri & Kaburaki, 1918 | | - | other taxonomic work | 290 |
| Pseudostylochus fuscoviridus Kato, 1934 | | - | other taxonomic work | 290 |
| Pseudostylochus elongatus Kato, 1937 | | - | other taxonomic work | 290 |
| Pseudostylochus okudai Kato, 1937 | | - | other taxonomic work | 290 |
| Pseudostylochus longipenis Kato, 1937 | | - | other taxonomic work | 290 |
| Pseudostylochus stimpsoni Kato, 1937 | | - | other taxonomic work | 290 |
| Pseudostylochus aino Kato, 1937 | | - | other taxonomic work | 291 |
| Pseudostylochus edurus Kato, 1938 | | - | other taxonomic work | 290 |
| Pseudostylochus maculatus Kato, 1938 | | - | other taxonomic work | 291 |
| Pseudostylochus meridialis Kato, 1938 | | - | other taxonomic work | 291 |
| Pseudostylochus nationalis Kato, 1939 | | - | other taxonomic work | 291 |
| Pseudostylochus intermedius Kato, 1939 | | - | other taxonomic work | 291 |
| Cestoplana rubrocincta (Grube, 1840) | | - | other taxonomic work | 293 |
| Cestoplana lactea Kato, 1937 | | - | other taxonomic work | 293 |
| Cestoplana marina Kato, 1938 | | - | other taxonomic work | 293 |
| Pericelis byerleyana (Collingwood, 1876) | | w | other taxonomic work | 294 |
| Boninia mirabilis Bock, 1923 | | - | other taxonomic work | 294 |
| Thysanozoon brocchii (Risso, 1818) | | - | other taxonomic work | 294-295, Text-figs. 38, 39 |
| Thysanozoon vulgaris Palombi, 1939 | | w | other taxonomic work | 295-297, Text-figs. 40, 41 |
| Pseudoceros interruptus (Stimpson, 1855) | | - | other taxonomic work | 298 |
| Pseudoceros guttatomarginatus (Stimpson, 1855) | | - | other taxonomic work | 298 |
| Pseudoceros fulminatus (Stimpson, 1855) | | - | other taxonomic work | 298 |
| Pseudoceros coccineus (Stimpson, 1857) | | - | other taxonomic work | 298 |
| Pseudoceros albicornis (Stimpson, 1857) | | w | other taxonomic work | 298 |
| Pseudoceros niger (Stimpson, 1857) | | - | other taxonomic work | 298 |
| Pseudoceros japonicus (Stimpson, 1857) | | - | other taxonomic work | 298 |
| Pseudoceros flavomarginatus Laidlaw, 1902 | | - | other taxonomic work | 298-299 |
| Pseudoceros bedfordi Laidlaw, 1903 | | - | other taxonomic work | 299 |
| Pseudoceros reticulatus Yeri & Kaburaki, 1918 | | - | other taxonomic work | 299 |
| Pseudoceros nigromarginatus Yeri & Kaburaki, 1918 | | - | other taxonomic work | 299 |
| Pseudoceros atropurpureus Kato, 1934 | | - | other taxonomic work | 299 |
| Pseudoceros micropapillosus Kato, 1934 | | - | other taxonomic work | 299 |
| Pseudoceros gratus Kato, 1937 | | - | other taxonomic work | 299 |
| Pseudoceros yeesoensis Kato, 1937 | | w | other taxonomic work | 300 |
| Pseudoceros sagamianus Kato, 1937 | [with synonyms] | w | other taxonomic work | 300 |
| Pseudoceros memoralis Kato, 1938 | | - | other taxonomic work | 300 |
| Eurylepta susakiensis (Kato, 1934) | | - | other taxonomic work | 302-304, Pl. XXIX, figs. 2-4; Text-figs. 47, 48 |
| Cycloporus variegatus Kato, 1934 | | - | other taxonomic work | 304 |
| Stylostomum hozawai Kato, 1939 | | - | other taxonomic work | 305 |
| Leptoteredra tentaculata Kato, 1943 | | w | other taxonomic work | 306 |
| Chromoplana bella Bock, 1922 | | - | other taxonomic work | 306 |
| Amyella lineata Bock, 1922 | | - | other taxonomic work | 306 |
| Prosthiostomum grande Stimpson, 1857 | | - | other taxonomic work | 307 |
| Prosthiostomum marmoratum Yeri & Kaburaki, 1918 | | - | other taxonomic work | 307 |
| Prosthiostomum awaense Yeri & Kaburaki, 1918 | | w | other taxonomic work | 307 |
| Prosthiostomum rubropunctatum Yeri & Kaburaki, 1918 | | - | other taxonomic work | 307 |
| Prosthiostomum trilineatum Yeri & Kaburaki, 1920 | | - | other taxonomic work | 307 |
| Prosthiostomum asiaticum Kato, 1937 | | - | other taxonomic work | 307 |
| Prosthiostomum auratum Kato, 1937 | | - | other taxonomic work | 307 |
| Prosthiostomum formosum Kato, 1943 | | - | other taxonomic work | 308 |
| Prosthiostomum ostreae Kato, 1937 | | - | other taxonomic work | 308 |
| Prosthiostomum purum Kato, 1937 | | - | other taxonomic work | 308 |
| Prosthiostomum yerii Kato, 1937 | | w | other taxonomic work | 308 |
| Prosthiostomum sonorum Kato, 1938 | | - | other taxonomic work | 308 |
| Prosthiostomum laetum Kato, 1938 | | - | other taxonomic work | 308 |
| Prosthiostomum bellum Kato, 1939 | | - | other taxonomic work | 308 |
| Prosthiostomum nozakensis Kato, 1944 | | - | primary taxonomic authority (describer) | 311, Text-figs. 57, 58 |
| Amakusaplana ohshimai Kato, 1938 | | w | other taxonomic work | 313 |
| Imogine hamanensis (Kato, 1944) | | w | primary taxonomic authority (describer) | |
| Imogine hamanensis (Kato, 1944) | | w | latest taxonomic authority | |
| Imogine izuensis (Kato, 1944) | | w | primary taxonomic authority (describer) | |
| Imogine izuensis (Kato, 1944) | | w | latest taxonomic authority | |
| Imogine miyadii (Kato, 1944) | | w | primary taxonomic authority (describer) | |
| Imogine miyadii (Kato, 1944) | | w | latest taxonomic authority | |
| Imogine uniporus (Kato, 1944) | | w | primary taxonomic authority (describer) | |
| Imogine uniporus (Kato, 1944) | | w | latest taxonomic authority | |
| Taenioplaninae Ilyplanoides Kato, 1944 | [with synonyms] | - | primary taxonomic authority (describer) | 604 |
| Ilyplanoides mitsui (Kato, 1944) | [with synonyms] | - | primary taxonomic authority (describer) | |