Species (15.149)
- Telotrichidium henneguyi
- Thalassiphora pelagica
- Thalassiphora velata
- Thigmokeronopsis antarctica Petz 1995
- Thuricola amphora
- Thuricola gracilis
- Thuricola kamptostoma
- Thuricola obliqua
- Thuricola operculata
- Thuricola pediculata
- Thuricola viridis
- Spathidium cyclidium
- Tintinnidium marinum
- Tintinnopsella besici
- Tintinnopsella bacinensis
- Tintinnopsella dalmatica
- Tintinnopsella cyttarocyliformis
- Tintinnopsella colomi
- Vorticella sp.
- Tintinnopsella doliphormis
- Tintinnopsella gracilis
- Tintinnopsella longa
- Tintinnopsella ricta
- Tintinnopsella oblonga
- Tintinnopsella proplectelloides
- Tintinnopsella maxima
- Tintinnopsella remanei
- Tintinnopsella simplex
- Tintinnopsis brasiliensis
- Tintinnopsis butschlii
- Tintinnopsis cheribonensis
- Tintinnopsis chinglanensis
- Tintinnopsis digita
- Tintinnopsis fracta
- Tintinnopsis corniger Hada 1964
- Tintinnopsis fusus
- Tintinnopsis nordquisti
- Tintinnopsis tentaculata
- Tintinnus inquilius
- Amphileptus muscicola
- Tintinnus macilentus
- Tintinnus mediterranus
- Tintinnus obliquus
- Tintinnus norwegicus
- Tintinnus palliata
- Tintinnus pedicellatus
- Tintinnus regulatus
- Tintinnus serratus
- Tintinnus striatus
- Tintinnus sessilis
- Tintinnus steenstrupii
- Tintinnus steenstrupi
- Tintinnus subulatus ssp. subulatus
- Tintinnus ussowi
- Tintinnus undatus
- Tintinus campanula
- Tintinnus urnula Claparède & Lachmann 1858
- Oxytricha hymenostoma Stokes 1887
- Tintinus ehrenbergii
- Tintinnus mediterraneus Mereschkowsky 1880
- Tintinus sulcatus
- Tintinus intermedius
- Tintinus obliquus
- Tocophrya cyclopis
- Tocophrya cyclopum
- Teretrichodina balakrishnia Santhakumari & Nair ß
- Tetrahymena bergeri
- Ilsiella terricola
- Urostyla gracilis ssp. pallida
- Tetrahymena edaponi
- Tetrahymena furgasoni
- Tetrahymena leucophrys
- Cyclidium bonneti
- Paraurostyla coronata
- Teuthophrys trisulca Chatton & Beauchamp 1923
- Thecacineta halacari
- Thecacineta caepula
- Thigmogaster nanus Song & Wilbert 1989
- Thigmokeronopsis crystallis Petz 1995
- Tachysoma balatonica
- Tachysoma dragescoi Song & Wilbert 1997
- Tachysoma parvistyla Stokes 1887
- Syringopharynx pterotrachae
- Tachysoma fusiformis Gelei & Szabados 1950
- Urostyla gracilis Entz 1884 ssp. sanguinea
- Tachysoma hyalinum
- Tachysoma ovata Song & Wilbert 1997
- Tanystomium nudum
- Tillina falvicans
- Tintinnidium fluviatile ssp. emarginata
- Tintinnidium inquilinus
- Tintinnidium setigerum
- Tintinnopsella scadrica
- Tintinnopsis amoyensis
- Tintinnopsis beroidea ssp. rotundata
- Tintinnopsis campanula ssp. buetschlii
- Tintinnopsis lohmanni
- Tintinnopsis pellucida
- Tintinnopsis rotundata
- Tintinnopsis pseudocylindrica