| Synsiphonium | anderssoni | (Westblad, 1952) | |
| Siphoniella | anderssoni | Westblad, 1952 | |
| Gonostomula | anocelis | Westblad, 1955 | |
| Umagillinae | Anoplodiera | Westblad, 1930 | |
| Umagillinae | Anoplodiopsis | Westblad, 1953 | |
| Meixnerides | armatus | Westblad, 1952 | |
| Syndisyrinx | atriovillosa | (Westblad, 1953) | |
| Syndesmis | atriovillosa | (Westblad, 1953) | |
| Marcusella | atriovillosa | Westblad, 1953 | |
| Aphanostoma | auritum | Westblad, 1946 | |
| Anaperus | australis | Westblad, 1952 | |
| Thalassoanaperus | australis | (Westblad, 1952) | |
| Mecynostomum | bathycola | Westblad, 1948 | |
| Monocelis | bathycola | Westblad, 1952 | |
| Archimonocelis | bathycola | (Westblad, 1952) | |
| Eumecynostomum | bathycolum | (Westblad, 1948) | |
| Pseudmecynostomum | bathycolum | (Westblad, 1948) | |
| Plagiostomum | birmanse | Westblad, 1956 | |
| (Multipeniata) | birmanse | (Westblad, 1956) | |
| Cylindrostoma | bitubata | Westblad, 1952 | |
| Xenoturbella | bocki | Westblad, 1949 | |
| Gnosonesima | borealis | (Westblad, 1952) | |
| Gnosonesimila | borealis (1) | Westblad, 1952 | |
| Gnosonesimila | borealis (2) | Westblad, 1952 | |
| Monocelidinae | Boreocelis | Westblad, 1952 | |
| Childia | brachyposthium | (Westblad, 1942) | |
| Paraphanostoma | brachyposthium | Westblad, 1942 | |
| Proporus | brochii | Westblad, 1945 | |
| Centrovarioplanidae | Centrovarioplana | Westblad, 1952 | |
| Cercyroidea | Centrovarioplanidae | Westblad, 1952 | |
| Enterostomula | crassicystifera | Westblad, 1952 | |
| Allostoma | crassicystiferum | (Westblad, 1952) | |
| Paraphanostoma | crassum | Westblad, 1942 | |
| Childia | crassum | (Westblad, 1942) | |
| Graffilla | curiosa | Westblad, 1954 | |
| Paraphanostoma | cycloposthium | Westblad, 1942 | |
| Childia | cycloposthium | (Westblad, 1942) | |
| Acoela | Diopisthoporidae | Westblad, 1940 | |
| Diopisthoporidae | Diopisthoporus | Westblad, 1940 | |
| Childia | dubium | (Westblad, 1942) | |
| Paraphanostoma | dubium | Westblad, 1942 | |
| Seritia | elegans | (Westblad, 1953) | |
| Ozametra | elegans | Westblad, 1953 | |
| Lenopharynginae | Espegrendia | Westblad, 1954 | |
| Allostoma | pallidum | f.pusillum | Westblad, 1955 |
| Mecynostomidae | Faerlea | Westblad, 1945 | |
| Convolutidae | Faerlea | Westblad, 1945 | |
| Isodiametridae | Faerlea | Westblad, 1945 | |
| Neppia | falklandica | (Westblad, 1952) | |
| Dugesia | falklandica | (Westblad, 1952) | |
| Curtisia | falklandica | Westblad, 1952 | |
| Cura | falklandica | (Westblad, 1952) | |
| Brinkmanniella | falklandica | Westblad, 1952 | |
| Plagiostomum | falklandicum | Westblad, 1952 | |
| Plagiostomum | filicauda | Westblad, 1956 | |
| Boreocelis | filicauda | Westblad, 1952 | |
| Mecynostomum | auritum | flavescens | (Westblad, 1946) |
| Aphanostoma | auritum | flavescens | Westblad, 1946 |
| Faerlea | fragilis | Westblad, 1945 | |
| Pentacoelum | fucoideum | Westblad, 1935 | |
| Plagiostomum | girardi | girardi | Westblad, 1956 |
| Avagina | glandulifera | Westblad, 1953 | |
| Mecynostomum | auritum | glandulosum | (Westblad, 1946) |
| Pseudmecynostomum | glandulosum | (Westblad, 1946) | |
| Postmecynostomum | glandulosum | (Westblad, 1946) | |
| Aphanostoma | auritum | glandulosum | Westblad, 1946 |
| Globuliphorinae | Globuliphora | Westblad, 1952 | |
| Monocelididae | Globuliphorinae | Westblad, 1952 | |
| Faerlea | glomerata | Westblad, 1945 | |
| Gnosonesimidae | Gnosonesimila | Westblad, 1952 | |
| Pseudostomidae | Gonostomula | Westblad, 1955 | |
| Pseudostomum | gracilis | Westblad, 1955 | |
| Childia | gracilis | (Westblad, 1945) | |
| Paraphanostoma | gracilis | Westblad, 1945 | |
| Cylindrostoma | gracilis | Westblad, 1955 | |
| Notocelis | gullmarensis | (Westblad, 1946) | |
| Otocelis | gullmarensis | Westblad, 1946 | |
| Hallangiidae | Hallangia | Westblad, 1946 | |
| Prosopharyngida | Hallangiidae | Westblad, 1946 | |
| Microstomum | hamatum | Westblad, 1953 | |
| Acoela | Haploposthiidae | Westblad, 1948 | |
| Reisingeria | hexoculatus | Westblad, 1955 | |
| Peraclistus | itaipus (2) | Westblad, 1952 | |
| Philocelis | karlingi | (Westblad, 1946) | |
| Convoluta | karlingi | Westblad, 1946 | |
| Philocelis | karlingi | karlingi | (Westblad, 1946) |
| Monticellina | longituba | Westblad, 1953 | |
| Diopisthoporus | longitubus | Westblad, 1940 | |
| Pelophila | lutheri | (Westblad, 1946) | |
| Acoelopelophila | lutheri | (Westblad, 1946) | |
| Pelophila | lutheri | (Westblad, 1946) | |
| Aphanostoma | lutheri | Westblad, 1946 | |
| Cylindrostoma | lutheri | Westblad, 1955 | |
| Convoluta | lutheri | Westblad, 1940 | |
| Mecynostomum | lutheri | (Westblad, 1946) | |
| Praeaphanostoma | lutheri | Westblad, 1946 | |
| Aphanostoma | macrobursalium | Westblad, 1946 | |
| Eumecynostomum | macrobursalium | (Westblad, 1946) | |
| Mecynostomum | macrobursalium | (Westblad, 1946) | |
| Pseudmecynostomum | macrobursalium | (Westblad, 1946) | |
| Pseudoposthia | macrogonopora | Westblad, 1946 | |
| Baltalimania | macrospiriferum | (Westblad, 1946) | |
| Mecynostomum | macrospiriferum | (Westblad, 1946) | |
| Aphanostoma | macrospiriferum | Westblad, 1946 | |
| Archaphanostoma | macrospiriferum | (Westblad, 1946) | |
| Wahlia | macrostylifera | Westblad, 1930 | |
| Umagillinae | Marcusella | Westblad, 1953 | |
| Nemertodermatidae | Meara | Westblad, 1949 | |
| Meixnerididae | Meixnerides | Westblad, 1952 | |
| Cercyroidea | Meixnerididae | Westblad, 1952 | |
| Cylindrostoma | micropharynx | Westblad, 1952 | |
| Convoluta | minima | Westblad, 1948 | |
| Haplogonaria | minima | (Westblad, 1946) | |
| Mecynostomum | minimum | (Westblad, 1946) | |
| Aphanostoma | minimum | Westblad, 1946 | |
| Haploposthia | monogonophora | Westblad, 1946 | |
| Kuma | monogonophora | (Westblad, 1946) | |
| Umagillinae | Monticellina | Westblad, 1953 | |
| Trepaxonemata | Neoophora | Westblad, 1948 | |
| Conaperta | norvegica | (Westblad, 1946) | |
| Praeconvoluta | norvegica | (Westblad, 1946) | |
| Espegrendia | norvegica | Westblad, 1954 | |
| Convoluta | norvegica | Westblad, 1946 | |
| Isodiametra | norvegica | (Westblad, 1946) | |
| Plagiostomum | nostrum | Westblad, 1956 | |
| Notomonoophorum | oculatum | Westblad, 1954 | |
| Crucimusculata | Otocelididae | Westblad, 1948 | |
| Palombiellinae | Palombiella | Westblad, 1952 | |
| incertae sedis | Paraconvoluta | Westblad, 1946 | |
| Anaperidae | Paranaperus | Westblad, 1942 | |
| Childiidae | Paraphanostoma | Westblad, 1942 | |
| Mecynostomidae | Paraphanostoma | Westblad, 1942 | |
| Actinoposthiidae | Paraproporus | Westblad, 1945 | |
| Childiidae | Paraproporus | Westblad, 1945 | |
| Paranaperus | pellucidus | Westblad, 1942 | |
| Haploposthia | pellucidus | (Westblad, 1942) | |
| Bdellourinae | Pentacoelum | Westblad, 1935 | |
| incertae sedis | Plagiostomula | Westblad, 1956 | |
| Procerodidae | Procerodinae | Westblad, 1952 | |
| Hallangia | proporoides | Westblad, 1946 | |
| Isodiametridae | Pseudaphanostoma | Westblad, 1946 | |
| Convolutidae | Pseudaphanostoma | Westblad, 1946 | |
| Isodiametridae | Pseudoposthia | Westblad, 1946 | |
| Philactinoposthia | pusilla | (Westblad, 1946) | |
| Convoluta | pusilla | Westblad, 1946 | |
| Pseudostomidae | Reisingeria | Westblad, 1955 | |
| Convoluta | rhammifera | Westblad, 1946 | |
| Philactinoposthia | rhammifera | (Westblad, 1946) | |
| Mecynostomum | rhomboides | Westblad, 1946 | |
| Aphanostoma | rhomboides | Westblad, 1946 | |
| Thalassoanaperus | rubellus | (Westblad, 1945) | |
| Anaperus | rubellus | Westblad, 1945 | |
| Paraproporus | rubescens | Westblad, 1945 | |
| Haploposthia | rubropunctata | Westblad, 1945 | |
| Globuliphora | rufifrons | Westblad, 1952 | |
| Monotoplana | rufifrons | (Westblad, 1952) | |
| Plagiostomum | cuticulata | scandinavica | (Westblad, 1956) |
| Bdellouridae | Siphoniella | Westblad, 1952 | |
| Desmote | sp. | (Westblad, 1952) | |
| Solenopharynx | sp. | (Westblad, 1952) | |
| Coleophora | sp. | (Westblad, 1952) | |
| Cylindrostoma | sp. | Westblad, 1952 | |
| Nemertoderma | sp. | Westblad, 1937 | |
| Microstomum | spiriferum | Westblad, 1953 | |
| Meara | stichopi | Westblad, 1949 | |
| Einarhelmins | stilifera | (Westblad, 1955) | |
| Monoophorum | stiliferum | Westblad, 1955 | |
| Plagiostomum | striatum | Westblad, 1956 | |
| Pseudohaplogonaria | stylifera | (Westblad, 1946) | |
| Philactinoposthia | stylifera | (Westblad, 1946) | |
| Philactinoposthia | stylifera | stylifera | (Westblad, 1946) |
| Convoluta | stylifera | Westblad, 1946 | |
| Childia | submaculatum | (Westblad, 1942) | |
| Paraphanostoma | submaculatum | Westblad, 1942 | |
| Centrovarioplana | tenuis | Westblad, 1952 | |
| Proaphanostoma | tenuissima | (Westblad, 1946) | |
| Avagina | tenuissima | (Westblad, 1946) | |
| Aphanostoma | tenuissima | Westblad, 1946 | |
| Mecynostomum | tenuissimum | (Westblad, 1946) | |
| Childia | trianguliferum | (Westblad, 1942) | |
| Paraphanostoma | trianguliferum | Westblad, 1942 | |
| Cylindrostoma | tubiferum | Westblad, 1955 | |
| Anoplodium | tubiferum | Westblad, 1953 | |
| Monoophorum | tubiferum | (Westblad, 1955) | |
| Mecynostomum | auritum | typica | (Westblad, 1946) |
| Aphanostoma | auritum | typica | Westblad, 1946 |
| Fecampiida | Urastomidae | Westblad, 1955 | |
| Enterostomula | uterina | Westblad, 1952 | |
| Allostoma | uterinum | (Westblad, 1952) | |
| Pseudaphanostoma | variabilis | Westblad, 1946 | |
| Paraconvoluta | virescens | Westblad, 1946 | |
| Convoluta | viridipunctata | Westblad, 1946 | |
| Pseudohaplogonaria | viridipunctata | (Westblad, 1946) | |
| Plagiostomula | vivipara (2) | Westblad, 1956 | |
| Plagiostomula | vivipara (l) | Westblad, 1956 | |
| Anoplodiera | voluta | Westblad, 1930 | |
| Umagillinae | Wahlia | Westblad, 1930 | |
| Nemertoderma | westbladi | (Westblad, 1937) | |
| Xenoturbellidae | Xenoturbella | Westblad, 1949 | |
| Xenoturbellida | Xenoturbellidae | Westblad, 1949 |
200 names, including those in new combination. (Max listing set to 900)