| Euryleptinae | Aceros | Lang, 1884 | |
| Euryleptidae | Aceros | Lang, 1884 | |
| Polycladida (II) | Acotylea | Lang, 1884 | |
| Polycladida | Acotylea | Lang, 1884 | |
| Stylochoplana | agilis | Lang, 1884 | |
| Comoplana | agilis | (Lang, 1884) | |
| Stylochoplana | agilis | Lang, 1884 | |
| Cryptocelis | alba | Lang, 1884 | |
| Leptoplana | alba | Lang, 1880 | |
| Prostheceraeus | albicinctus | Lang, 1884 | |
| Prostheceraeus | albocinctus | Lang, 1884 | |
| Cotylea | Anonymidae | Lang, 1884 | |
| Pseudocerotoidea | Anonymidae | Lang, 1884 | |
| Anonymoidea | Anonymidae | Lang, 1884 | |
| Anonymidae | Anonymus | Lang, 1884 | |
| Anonymidae | Anonymus | Lang, 1884 | |
| Trigonoporus | cephalophthalmus | Lang, 1884 | |
| Trigonoporus | cephalophthalmus | Lang, 1884 | |
| Cestoplanidae | Cestoplana | Lang, 1884 | |
| Cestoplanidae | Cestoplana | Lang, 1884 | |
| Cotylea | Cestoplanidae | Lang, 1884 | |
| Cestoplanoidea | Cestoplanidae | Lang, 1884 | |
| Leptoplanoidea | Cestoplanidae | Lang, 1884 | |
| Cestoplanoidea | Cestoplanidae | Lang, 1884 | |
| Cryptocelis | compacta | Lang, 1884 | |
| Cryptocelis | compacta | Lang, 1884 | |
| incertae sedis | Conoceros | Lang, 1884 | |
| Polycladida (II) | Cotylea | Lang, 1884 | |
| Polycladida | Cotylea | Lang, 1884 | |
| Cryptocelidinae | Cryptocelis | Lang, 1884 | |
| Cryptocelidinae | Cryptocelis | Lang, 1884 | |
| Euryleptinae | Cycloporus | Lang, 1884 | |
| Euryleptidae | Cycloporus | Lang, 1884 | |
| Prosthiostomum | dohrnii | Lang, 1884 | |
| Prosthiostomum | dohrnii | Lang, 1884 | |
| Euryleptoidea | Euryleptidae | Lang, 1884 | |
| Cestoplana | faraglionensis | Lang, 1884 | |
| Cestoplana | faraglionensis | Lang, 1884 | |
| Prostheceraeus | giesbrechtii | Lang, 1884 | |
| Prostheceraeus | giesbrechtii | Lang, 1884 | |
| Planocera | graffi | Lang, 1879 | |
| Planocera | graffi | Lang, 1879 | |
| Acerotisa | inconspicua | (Lang, 1884) | |
| Acerotisa | inconspicua | (Lang, 1884) | |
| Aceros | inconspicuus | Lang, 1884 | |
| Aceros | inconspicuus | Lang, 1884 | |
| Planocera | insignis | Lang, 1884 | |
| Planocera | insignis | Lang, 1884 | |
| Hoploplana | insignis | (Lang, 1884) | |
| Hoploplana | insignis | (Lang, 1884) | |
| Cryptocelis | lactea | Lang, 1884 | |
| Cycloporus | papillosus (2) | laevigatus | Lang, 1884 |
| Cycloporus | papillosus | levigatus var. | Lang, 1884 |
| Eurylepta | cornuta | lobianchi var. | (Lang, 1879) |
| Proceros | lobianchii | Lang, 1879 | |
| Eurylepta | lobianchii | (Lang, 1879) | |
| Eurylepta | lobianchii | (Lang, 1879) | |
| Pseudoceros | maximus | Lang, 1884 | |
| Pseudoceros | maximus-type A | Lang, 1884 | |
| Pseudoceros | maximus-typeB | Lang, 1884 | |
| Prostheceraeus | moseleyi | Lang, 1884 | |
| Prostheceraeus | moseleyi | Lang, 1884 | |
| Leptoplana | moseleyi | Lang, 1884 | |
| Leptoplana | moseleyi | Lang, 1884 | |
| Thysanozoon | brocchii | nigrum var. | Lang, 1884 |
| Euryleptidae | Oligocladus | Lang, 1884 | |
| Euryleptinae | Oligocladus | Lang, 1884 | |
| Hoploplana | papillosa | Lang, 1884 | |
| Hoploplana | papillosa | (Lang, 1884) | |
| Planocera | papillosa | Lang, 1884 | |
| Planocera | papillosa | Lang, 1884 | |
| Thysanozoon | brocchii | papillosum var. | Lang, 1884 |
| Cycloporus | papillosus (2) | Lang, 1884 | |
| Planoceroidea | Planoceridae | Lang, 1884 | |
| Stylochoidea | Planoceridae | Lang, 1884 | |
| Stylochus | plessisii | Lang, 1884 | |
| Stylochus | plessisii | Lang, 1884 | |
| Amplimatricata | Polycladida | Lang, 1884 [sensu Faubel 1983/1984] | |
| Amplimatricata | Polycladida (II) | Lang, 1884 [sensu Prudhoe, 1985] | |
| Euryleptoidea | Prosthiostomidae | Lang, 1884 | |
| Cotylea | Prosthiostomidae | Lang, 1884 | |
| Cotylea | Prosthiostomidae | Lang, 1884 | |
| Pseudocerotidae | Pseudoceros | Lang, 1884 | |
| Pseudocerotidae | Pseudoceros | Lang, 1884 | |
| Pseudocerotoidea | Pseudocerotidae | Lang, 1884 | |
| Cotylea | Pseudocerotidae | Lang, 1884 | |
| Prostheceraeus | pseudolimax | Lang, 1884 | |
| Prostheceraeus | pseudolimax | Lang, 1884 | |
| Prostheceraeus | roseus | Lang, 1884 | |
| Prostheceraeus | roseus | Lang, 1884 | |
| Prostheceraeus | rubropunctatus | Lang, 1884 | |
| Prostheceraeus | rubropunctatus | Lang, 1884 | |
| Oligocladus | sanguinolentus | Lang, 1884 | |
| Gunda | segmentata | Lang, 1881 | |
| Procerodes | segmentata | (Lang, 1881) | |
| Pseudoceros | splendidus | (Lang, 1884) | |
| Pseudobiceros | splendidus | (Lang, 1884) | |
| Pseudobiceros | splendidus | (Lang, 1884) | |
| Stylostomidae | Stylostomum | Lang, 1884 | |
| Euryleptinae | Stylostomum | Lang, 1884 | |
| Pseudoceros | superbus (1) | Lang, 1884 | |
| Pseudoceros | superbus (2) | Lang, 1884 | |
| Adiaphanida | Tricladida | Lang, 1884 | |
| Callioplanidae | Trigonoporus | Lang, 1884 | |
| Trigonoporinae | Trigonoporus | Lang, 1884 | |
| Cycloporus | tuberculatus | (Lang, 1880) | |
| Stylostomum | variabile | Lang, 1884 | |
| Stylostomum | variabile | Lang, 1884 | |
| Hoploplana | villosa | (Lang, 1884) | |
| Hoploplana | villosa | (Lang, 1884) | |
| Planocera | villosa | Lang, 1884 | |
| Planocera | villosa | Lang, 1884 | |
| Anonymus | virilis | Lang, 1884 | |
| Anonymus | virilis | Lang, 1884 | |
| Notoplana | vitrea | (Lang, 1884) | |
| Leptoplana | vitrea | Lang, 1884 | |
| Notoplana | vitrea | (Lang, 1884) | |
| Leptoplana | vitrea | Lang, 1884 | |
| Pseudocerotidae | Yungia | Lang, 1884 | |
| Pseudocerotidae | Yungia | Lang, 1884 |
120 names, including those in new combination. (Max listing set to 900)