| Plagiostomum | abboti | Karling, 1962 | |
| Alexlutheria | acrosiphoniae | Karling, 1956 | |
| Cicerinidae | Acrumeninae | Karling, 1980 | |
| Odontorhynchus | aculeatus | Karling, 1956 | |
| Annulorhynchus | adriaticus | Karling, 1956 | |
| Jenseniidae | Alexlutheria | Karling, 1956 | |
| Allostoma | amoenum | Karling, 1962 | |
| Asilomaria | ampullata | Karling, 1966 | |
| Rogneda | anglica | Karling, 1953 | |
| Phonorhynchoidinae | Annalisella | Karling, 1978 | |
| Scanorhynchinae | Annulorhynchus | Karling, 1956 | |
| Anthopharynginae | Anthopharynx | Karling, 1940 | |
| Polycystidinae | Antiboreorhynchus | Karling, 1952 | |
| Calviriidae | Asilomaria | Karling, 1966 | |
| Pterastericola | astropectinis | (Bashiruddin & Karling, 1970) | |
| Triloborhynchus | astropectinis | Bashiruddin & Karling, 1970 | |
| Polycystidinae | Austrorhynchus | Karling, 1952 | |
| Ptychopera | avicularis | Karling, 1974 | |
| Parachrorhynchus | axi | Karling, 1956 | |
| Cystiplex | axi | Karling, 1964 | |
| Koinocystididae | Axiutelga | Karling, 1980 | |
| Falkla | bacillata | Karling, 1952 | |
| Minona | baltica | Karling & Kinnander, 1953 | |
| Cheliplanidae | Baltoplana | Karling, 1949 | |
| Parachrorhynchus | bergensis | Karling, 1956 | |
| Plagiostomum | girardi | bermudensis | Karling, 1978 |
| Ceratopera | bermudensis | Karling, 1986 | |
| Annalisella | bermudensis | Karling, 1978 | |
| Polycystidinae | Bermudorhynchus | Karling, 1978 | |
| Phonorhynchella | biarcuata | Karling, 1956 | |
| Cicerina | bicirrata | Karling, 1989 | |
| Pogaina | bicornis | Karling, 1986 | |
| Papia | bifida | Karling, 1956 | |
| Parautelga | bilioi | Karling, 1964 | |
| Reinhardorhynchus | bispina | (Karling, 1980) | |
| Itaipusa | bispina | Karling, 1980 | |
| Minona | bistylifera | Karling, Mack-Fira & Doerjes, 1972 | |
| Utelga | bocki | Karling, 1954 | |
| Itaspiella | bodegae | Karling, 1964 | |
| Hypoblepharina | boehmigi | Karling, 1973 | |
| Plagiostomum | boehmigi | Karling & Jondelius, 1995 | |
| Psammopolycystis | bondensis | Karling, 1956 | |
| Coelogynopora | brachystyla | Karling, 1966 | |
| Gnosonesima | brattstroemi | Karling, 1968 | |
| incertae sedis | Brederweldia | Karling, 1978 | |
| Psammopolycystis | bredungensis | Karling, 1956 | |
| Orthoplana | bregazzii | Karling, 1973 | |
| Austrorhynchus | bruneti | Karling, 1977 | |
| Koinocystididae | Brunetia | Karling, 1980 | |
| Itaspiella | bursituba | Karling, 1964 | |
| Austrorhynchus | calcareus | Karling, 1977 | |
| Hangethellia | calceifera | calceifera | Karling, 1940 |
| Hangethellia | calceifera | Karling, 1940 | |
| (Multipeniata) | californica | Karling & Jondelius, 1995 | |
| Cheliplana | californica | Karling, 1989 | |
| Pseudostomum | californicum | Karling, 1962 | |
| Austrorhynchus | californicus | Karling, 1977 | |
| Prognathorhynchus | campylostylus | Karling, 1947 | |
| Prognathorhynchus | canaliculatus | Karling, 1947 | |
| Rogneda | capulata | Karling, 1953 | |
| Scleraulophorus | cephalatus | Karling, 1940 | |
| Leguta | chelifera | (Karling, 1954) | |
| Utelga | chelifera | (Karling, 1954) | |
| Cicerinidae | Cicerininae | Karling, 1952 | |
| Adenorhynchidae | Cilionema | Karling, Mack-Fira & Dörjes, 1972 | |
| Monocelis | cincta | Karling, 1966 | |
| Cytocystis | clitellatus | Karling, 1953 | |
| Placorhynchidae | Clyporhynchus | Karling, 1947 | |
| Promesostoma | cochleare | Karling, 1935 | |
| Typhlopolycystis | coeca | Karling, 1956 | |
| Lithophora | Coelogynoporidae | Karling, 1966 | |
| Diascorhynchus | collaris | Karling, 1956 | |
| Prolecithophora | Combinata | Karling, 1940 | |
| Paulodora | contorta | (Schockaert & Karling, 1975) | |
| Polycystis | contorta | Schockaert & Karling, 1975 | |
| Phonorhynchus | helgolandicus | contorted | Karling, 1982 |
| Typhlopolycystis | coomansi | Schockaert & Karling, 1975 | |
| Microvahine | corallicola | Karling, Mack-Fira & Dörjes, 1972 | |
| Minona | cornupenis | Karling, 1966 | |
| Archimonocelis | coronata | Karling, 1966 | |
| Itaipusa | curvicirra | Karling, 1980 | |
| Reinhardorhynchus | curvicirra | (Karling, 1980) | |
| Cystiplanidae | Cystiplana | Karling, 1964 | |
| Eukalyptorhynchia | Cystiplanidae | Karling, 1964 | |
| Cystiplanidae | Cystiplex | Karling, 1964 | |
| Eukalyptorhynchia | Cytocystididae | Karling, 1964 | |
| Cytocystididae | Cytocystis | Karling, 1953 | |
| Pseudominona | dactylifera | Karling, 1978 | |
| Scanorhynchinae | Danorhynchus | Karling, 1955 | |
| Proxenetes | denhartogi | Karling, 1978 | |
| Trigonostomum | denhartogi | (Karling, 1978) | |
| Archotoplana | dillonbeachensis | Karling, 1964 | |
| Rhinolasius | dillonicus | Karling, 1980 | |
| Placorhynchus | dimorphis | Karling, 1947 | |
| Placorhynchus | octaculeatus | dimorphis | Karling, 1947 |
| Promesostoma | dipterostylum | Karling, 1967 | |
| Placorhynchus | doei | Karling, 1995 | |
| Serpentiplana | doughertyi | Karling, 1964 | |
| Polycystididae | Duplacrorhynchinae | Schockaert & Karling, 1970 | |
| Polycystidinae | Duplacrorhynchus | Schockaert & Karling, 1970 | |
| Minoninae | Duplominona | Karling, 1966 | |
| Danorhynchus | duplostylis | Karling, 1955 | |
| Placorhynchus | echinulatus | Karling, 1947 | |
| Ceratopera | ehlersi | Karling, 1986 | |
| Cylindrostomidae | Einarhelmins | Karling, 1993 | |
| Pseudostomidae | Einarhelmins | Karling, 1993 | |
| Cheliplana | elkhornica | Karling, 1989 | |
| Cheliplana | evdonini | Karling, 1983 | |
| pectatus | f. Doppelt | Karling, 1952 | |
| pectatus | f. Einfach | Karling, 1952 | |
| pectatus | f. Sporn | Karling, 1952 | |
| pectatus | pectatus | f. Stachel | Karling, 1952 |
| Psammopolycystis | falcata | Karling, 1956 | |
| Koinocystididae | Falkla | Karling, 1952 | |
| Thylacorhynchus | filostylis | Karling, 1956 | |
| Uncinorhynchus | flavidus | Karling, 1947 | |
| Scanorhynchus | forcipatus | Karling, 1955 | |
| Polycystis | ali | form California | Karling, 1986 |
| Polycystis | ali | form Galapagos | Karling, 1986 |
| Polycystis | ali | form Somali | Karling, 1986 |
| Polycystidinae | Fungorhynchus | Karling, 1952 | |
| Koinocystididae | Getula | Karling, 1980 | |
| Trepaxonemata | Gnosonesimida | Karling, 1974 | |
| Danorhynchus | gosoeensis | Karling, 1955 | |
| Xenocicerina | gracilis | Karling, 1956 | |
| Itaipusina | graefei | Karling, 1980 | |
| Koinocystididae | Groveia | Karling, 1980 | |
| Proschizorhynchus | gullmarensis | Karling, 1950 | |
| Scanorhynchinae | Gyratricella | Karling, 1955 | |
| Jenseniidae | Halammovortex | Karling, 1943 | |
| Polycystis | hamata | Karling, 1986 | |
| Kirgisellinae | Hangethellia | Karling, 1940 | |
| Coelogynopora | hangoensis | Karling, 1953 | |
| Macrostomorpha | Haplopharyngida | Karling, 1974 | |
| Plagiostomum | hartmani | Karling, 1962 | |
| Cilionema | hawaiiensis | Karling, Mack-Fira & Dörjes, 1972 | |
| Austrorhynchus | hawaiiensis | Karling, 1977 | |
| Plagiostomum | hedgpethi | Karling, 1962 | |
| Archimonocelis | helfrichi | Karling, Mack-Fira & Dörjes, 1972 | |
| Proschizorhynchus | helgolandicus | Karling & L'Hardy, 1965 | |
| Nannorhynchides | herdlaensis | (Karling, 1956) | |
| Monocelis | hopkinsi | Karling, 1966 | |
| Paraschizorhynchoides | glandulis | hopkinsi | Karling, 1989 |
| Allostoma | hopkinsi | Karling, 1993 | |
| Schizochilus | hoxholdi | Karling, 1989 | |
| Balgetia | hyalina | Karling, 1962 | |
| Kalyla | hyalina | (Karling, 1962) | |
| Plagiostomum | hymani | Karling, 1962 | |
| Plagiostomum | girardi | hymani | Karling, 1962 |
| Neoutelga | inermis | Karling, 1980 | |
| Koinocystella | inermis | Karling, 1952 | |
| Proschizorhynchella | inflata | Karling, 1989 | |
| Koinocystididae | Itaipusina | Karling, 1980 | |
| Duplominona | kaneohei | Karling, Mack-Fira & Dörjes, 1972 | |
| Polycystidinae | Koinocystella | Karling, 1952 | |
| Archimonocelis | koinocystis | Karling, 1966 | |
| Gnathorhynchus | krogeni | Karling, 1947 | |
| Plagiostomum | langi | Karling, 1962 | |
| Diascorhynchus | lappvikensis | Karling, 1963 | |
| Koinocystididae | Leguta | Karling, 1980 | |
| Karkinorhynchidae | Lehardyia | Karling, 1983 | |
| Scanorhynchus | limophilus | Karling, 1955 | |
| Proschizorhynchella | lingulata | Karling, 1989 | |
| Hoplopera | littoralis | Karling, 1957 | |
| Odontorhynchus | lonchiferus | Karling, 1947 | |
| Prolecithoplana | lutheri | Karling, 1940 | |
| Parapharyngiella | mackfirae | (Karling, 1978) | |
| Proxenetes | mackfirae | Karling, 1978 | |
| Macrostomorpha | Macrostomida | Karling, 1940 | |
| Notocelis | gullmarensis | maculata | Karling, Mack-Fira & Doerjes, 1972 |
| Notocelis | maculata | Karling, Mack-Fira & Doerjes, 1972 | |
| Byrsophlebidae | Maehrenthaliella | Karling, 1985 | |
| Baltoplana | magna | Karling, 1949 | |
| Austrorhynchus | pectatus | magnificus | Karling, 1952 |
| Austrorhynchus | magnificus | Karling, 1952 | |
| Duplacrorhynchus | major | Schockaert & Karling, 1970 | |
| Austrorhynchus | maldivarum | Karling, 1977 | |
| Avagina | marci | Dörjes & Karling, 1975 | |
| Cheliplana | marcusi | (Karling, 1956) | |
| Rhinepera | marcusi | Karling, 1956 | |
| Paracicerina | maristoi | Karling, 1952 | |
| Placorhynchus | meridionalis | Karling, 1952 | |
| Koinocystididae | Mesorhynchus | Karling, 1956 | |
| Yaquinaia | microrhynchus | Schockaert & Karling, 1970 | |
| Paramesostominae | Microvahine | Karling, Mack-Fira & Dörjes, 1972 | |
| Monocelididae | Minoninae | Karling, 1978 | |
| Duplacrorhynchus | minor | Schockaert & Karling, 1970 | |
| Clyporhynchus | monolentis | Karling, 1947 | |
| Utelga | montereyensis | Karling, 1980 | |
| Prolecithophora | Multipeniatidae | Karling, 1940 | |
| Nannorhynchididae | Nannorhynchides | Karling, 1964 | |
| Nannorhynchididae | Nannorhynchus | Karling, 1956 | |
| Promesostoma | neglectum | Karling, 1967 | |
| Acoelomorpha | Nemertodermatida | Karling, 1940 | |
| Gnathorhynchidae | Neognathorhynchus | Karling, 1956 | |
| Scanorhynchinae | Neopolycystis | Karling, 1955 | |
| Allostoma | neostiliferum | Karling, 1993 | |
| Koinocystididae | Neoutelga | Karling, 1980 | |
| Dalyellia | nigrifrons | Karling, 1935 | |
| Halammovortex | nigrifrons | (Karling, 1935) | |
| Promesostoma | norvegicum | Karling, 1967 | |
| Plagiostomum | norvegicum | (Karling, 1940) | |
| Plicastoma | norvegicum | Karling, 1940 | |
| Hangethellia | calceifera | norwegica | Karling, 1940 |
| Antiboreorhynchus | novzelae | Karling & Schockaert, 1977 | |
| Plagiostomum | nucleipharyngeum | Karling & Jondelius, 1995 | |
| Promesostoma | nynaesiense | Karling, 1957 | |
| Minona | obscura | Karling, 1966 | |
| Placorhynchus | octaculeatus | octaculeatus | Karling, 1931 |
| Placorhynchus | octaculeatus | Karling, 1931 | |
| Gnathorhynchidae | Odontorhynchus | Karling, 1947 | |
| Oregoniplana | opisthopora | Holmquist & Karling, 1972 | |
| Cercyridae | Oregoniplana | Holmquist & Karling, 1972 | |
| Promonotus | orthocirrus | Karling, 1966 | |
| Tvaerminnea | karlingi | pacifica | Karling, 1986 |
| Ceratopera | pacifica | (Karling, 1986) | |
| Messoplana | pacifica | Karling, 1986 | |
| Austrorhynchus | pacificus | Karling, 1977 | |
| Paraustrorhynchus | pacificus | Karling & Schockaert, 1977 | |
| Uncinorhynchus | pacificus | Karling, 1989 | |
| Placorhynchus | pacificus | Karling, 1989 | |
| Cercyrini | Pacifides | Holmquist & Karling, 1972 | |
| Brinkmanniella | palmata | Karling, 1986 | |
| Typhlopolycystidinae | Papia | Karling, 1956 | |
| Byrsophlebidae | Parabyrsophlebs | Karling, 1985 | |
| Polycystidinae | Parachrorhynchus | Karling, 1956 | |
| Invenusta | paracnida | (Karling, 1966) | |
| Coelogynopora | paracnida | Karling, 1966 | |
| Cystiplana | paradoxa | Karling, 1964 | |
| Cylindrostoma | paralutheri | Karling, 1993 | |
| Pogaina | paranygulgus | Karling, 1986 | |
| Austrorhynchus | parapectatus | Karling, 1977 | |
| Polycystidinae | Paraustrorhynchus | Karling & Schockaert, 1977 | |
| Koinocystididae | Parautelga | Karling, 1964 | |
| pectatus | pectatus | Karling, 1952 | |
| Austrorhynchus | pectatus | Karling, 1952 | |
| Minona | peteraxi | Karling, 1978 | |
| Psammopolycystidinae | Phonorhynchella | Karling, 1956 | |
| Ceratopera | pilifera | Karling, 1986 | |
| Fungorhynchus | pistillatus | Karling, 1952 | |
| Placorhynchidae | Placorhynchus | Karling, 1931 | |
| Polycystididae | Polycystidinae | Schockaert & Karling, 1970 | |
| Minoninae | Preminona | Karling, 1966 | |
| Gyratrix | proaviformis | Karling & Schockaert, 1977 | |
| Adiaphanida | Prolecithophora | Karling, 1940 | |
| Protomonotresinae | Prolecithoplana | Karling, 1940 | |
| Amplimatricata | Prorhynchida | Karling, 1974 | |
| Pacifides | psammophilus | Holmquist & Karling, 1972 | |
| Eukalyptorhynchia | Psammorhynchidae | Karling, 1956 | |
| Utelga | pseudoheinckei | Karling, 1980 | |
| Minoninae | Pseudominona | Karling, 1978 | |
| Thylacorhynchus | pyriferus | Karling, 1950 | |
| Gnosonesima | reisingeri | Karling, 1968 | |
| Polycystis | riedli | Karling, 1956 | |
| Paulodora | riedli | (Karling, 1956) | |
| Reinhardorhynchus | riegeri | (Karling, 1978) | |
| Itaipusa | riegeri | Karling, 1978 | |
| Gnathorhynchus | riseri | Karling, 1995 | |
| Polycystis | robusta | (Karling, 1931) | |
| Acrorhynchides | robustus | (Karling, 1931) | |
| Acrorhynchus | robustus | Karling, 1931 | |
| Reinhardorhynchus | ruffinjonesi | (Karling, 1978) | |
| Itaipusa | ruffinjonesi | Karling, 1978 | |
| Zonorhynchus | salinus | Karling, 1952 | |
| Scanorhynchinae | Scanorhynchus | Karling, 1955 | |
| Proschizorhynchella | schilkei | Karling, 1989 | |
| Typhlopolycystis | schockaerti | Karling, 1978 | |
| Scleraulophoridae | Scleraulophorus | Karling, 1940 | |
| Itaipusa | scotica | (Karling, 1954) | |
| Utelga | scotica | Karling, 1954 | |
| Reinhardorhynchus | scotica | (Karling, 1954) | |
| Archimonocelis | semicircularis | Karling, 1966 | |
| Balgetia | semicirculifera | Karling, 1962 | |
| Kalyla | semicirculifera | (Karling, 1962) | |
| Zonorhynchus | seminascatus | Karling, 1956 | |
| Diascorhynchus | serpens | Karling, 1949 | |
| Otoplaninae | Serpentiplana | Karling, 1964 | |
| Hypoblepharina | serrifera | Karling & Nilsson, 1974 | |
| Vejdovskya | simrisiensis | Karling, 1957 | |
| Maehrenthaliella | sp. | Karling, 1985 | |
| Phonorhynchus | helgolandicus | spatula | Karling, 1982 |
| Itaipusa | spinibursa | Karling, 1978 | |
| Austrorhynchus | spinosus | Karling, 1977 | |
| Promesostoma | spiriferum | Karling, 1967 | |
| Bermudorhynchus | sterreri | Karling, 1978 | |
| Cheliplana | stylifera | Karling, 1949 | |
| Acrorhynchides | styliferus | Schockaert & Karling, 1975 | |
| Archilina | subtilis | (Karling, Mack-Fira, & Doerjes, 1972) | |
| Archiloa | subtilis | Karling, Mack-Fira & Dörjes, 1972 | |
| Neognathorhynchus | suecicus | Karling, 1956 | |
| Limipolycystis | swedmarki | Karling, 1978 | |
| Myobulla | swedmarki | (Karling, 1978) | |
| Monocelis | tenella | Karling, 1966 | |
| Coelogynopora | tenuiformis | Karling, 1966 | |
| Mesorhynchus | terminostylis | Karling, 1956 | |
| Plagiostomum | torquatum | Karling, 1940 | |
| Antiboreorhynchus | torquatus | Karling, 1952 | |
| Cicerina | triangularis | Karling, 1989 | |
| Cylindrostoma | triangulum | Karling, 1962 | |
| Neopolycystis | tridentata | Karling, 1955 | |
| Pterastericolidae | Triloborhynchus | Bashiruddin & Karling, 1970 | |
| Polycystidinae | Tringorhynchus | Karling | |
| Solenopharynginae | Trisaccopharynx | Karling, 1940 | |
| Psammomacrostomum | turbanelloides | Karling, 1974 | |
| Koinocystis | tvaerminnensis | Karling, 1931 | |
| Zonorhynchus | tvaerminnensis | (Karling, 1931) | |
| Typhlopolycystidinae | Typhlopolycystis | Karling, 1956 | |
| Phonorhynchus | helgolandicus | umbrella | Karling, 1982 |
| Utelga | uncinata | (Karling, 1978) | |
| Getula | uncinata | (Karling, 1978) | |
| Gnathorhynchidae | Uncinorhynchus | Karling, 1947 | |
| Groveia | unicornis | Karling, 1980 | |
| Cheliplana | vaginalis | Karling, 1983 | |
| Anthopharynx | vaginatus | Karling, 1940 | |
| Reinhardorhynchus | variodentata | (Karling, Mack-Fira, & Doerjes, 1972) | |
| Itaipusa | variodentata | (Karling, Mack-Fira, & Doerjes, 1972) | |
| Utelga | variodentata | (Karling, Mack-Fira, & Doerjes, 1972) | |
| Phonorhynchus | helgolandicus | veil | Karling, 1982 |
| Duplominona | westbladi | Karling, 1966 | |
| Trisaccopharynx | westbladi | Karling, 1940 | |
| Ulianinia | westbladi | Karling, 1963 | |
| Peraclistus | westbladi | (Karling, 1966) | |
| Rogneda | westbladi | Karling, 1953 | |
| Duploperaclistus | westbladi | (Karling, 1966) | |
| Uncinorhynchus | westbladi | Karling, 1952 | |
| Phonorhynchus | helgolandicus | winged | Karling, 1982 |
| Cicerininae | Xenocicerina | Karling, 1956 | |
| Polycystididae | Yaquinaia | Schockaert & Karling, 1970 | |
| Eukalyptorhynchia | Zonorhynchidae | Karling, 1952 | |
| Cicerinidae | Zonorhynchinae | Karling, 1952 | |
| Eukalyptorhynchia | Zonorhynchus | Karling, 1952 |
331 names, including those in new combination. (Max listing set to 900)