Species (15.149)
- Lomiella emiscolecis
- Lomiella raabei
- Lomiella gigantea
- Longifragma gracilis
- Longitricha flava Gajewskaja 1933
- Lorenziella hungarica Knauer & Nagy 1964
- Listacineta gracilis
- Loxodes cucullulus
- Loxodes penardi Dragesco 1960
- Loxodes marinus
- Loxodes reticulatus
- Loxodes rex Dragesco 1970
- Strombidium fallax Zacharias 1896
- Loxophyllum chlorelligerum
- Loxophyllum amphileptus
- Loxophyllum fusiforme
- Loxophyllum lionotiforme Kahl 1930
- Loxophyllum luteum
- Loxophyllum magnum
- Loxophyllum piriformis
- Loxophyllum polymorphum
- Loxophyllum psammophyllus Dragesco 1954
- Loxophyllum rostratum Cohn 1866 ssp. rostratum
- Loxophyllum setigerum ssp. setigerum
- Paragastronauta clatratus Deroux 1976
- Diesematostoma bütschlii
- Loxophyllum variabilis Dragesco 1954
- Loxophyllum viride
- Loxophyllum wrzesniowskii
- Loxophylum setigerum
- Tintinnopsis cratera
- Limnodysteria meridionalis
- Lionotus crystallinus Vuxanovici 1960
- Lionotus dusarti Dragesco 1960
- Lionotus diaphanus Wrzesniowski 1870
- Lionotus elongatus Dragesco 1960
- Linophora auerbachi
- Lionotus lanceolata Dragesco 1965
- Lionotus fasiola
- Lionotus pleurosigma Stokes 1884
- Tintinnidium fluviatile ssp. cylindrica
- Liosiphon ambiguus
- Lionotus wrzesniowskii
- Loxocephalus pelagicus Ruttner 1937
- Tintinnidium ephemeridum Hilliard 1968
- Loxodes caudatus
- Loxodes cuculio
- Loxodes magnum
- Loxodes magnus Stokes 1887 ssp. magnus
- Loxophyllum carinatum Vuxanovici 1959
- Loxophyllum contractile ssp. contractile
- Loxophyllum contractile
- Loxophyllum fasciolatus Dragesco 1966
- Loxophyllum fasciola
- Loxophyllum fibrillatus Dragesco 1954
- Loxophyllum helus Stokes 1884 ssp. helus
- Loxophyllum hellus Stokes 1884
- Loxophyllum inflatum
- Loxophyllum hohuensis
- Loxophyllum laevigatum Sauerbrey
- Loxophyllum lamella
- Loxophyllum lionotiforme Kahl 1930 ssp. lionotiforme
- Loxophyllum metabolicum
- Loxophyllum melegaris
- Loxophyllum ochrea
- Loxophyllum rostrum
- Loxocephalus foissneri Dragesco & Dragesco-Kerneis 1991
- Ophryoglena mucifera
- Ophryoglena octavia
- Ophryoglena panophrys
- Ophryoglena pelagica
- Ophryoglena polymicrocaryon
- Ophryoglena rhabdocaryon
- Ophryoglena wrzesniowskii
- Ophryoglena semivirescens
- Uroleptus bacillifer
- Ophryoscolex purkneyi
- Ophryoscolex purkynei
- Ophryoscolex purkynjei
- Opisthoden niemescensis Stein 1859
- Opisthiotricha tenuis
- Opisthonecta henneguy
- Opisthonecta hennegyui
- Opisthostomatella bengalensis
- Opisthostomum bengalensis
- Opisthostyla thienemanni
- Opisthostyla tritora
- Orbopercularia astacicola
- Orbopercularia calix
- Orbopercularia catillicola
- Orbopercularia carlae
- Orbopercularia corlissi
- Orbopercularia dreyeri
- Orbopercularia exigata
- Orbopercularia enochri
- Orbopercularia femoralis
- Orbopercularia finki
- Orbopercularia finleyi
- Orbopercularia gnathophila
- Orbopercularia micronectae