Species (22.489)
- Ammobaculites parvispira
- Amphisia diademata Rees 1884
- Amphisia kessleri
- Amphisia gibba
- Amphisia marioni
- Amphisia pernix
- Amphisia piscis
- Amphisia velox
- Amphisiella oscensis
- Amphisiella perisincirra
- Amphista crassa
- Amphistegina lessonii
- Amphista diademata
- Amphorella ampla
- Amphorella borealis
- Amphorella pallida
- Amphorella steenstrupi
- Amphorellina lanceolata
- Amphorella subulata Daday 1887 ssp. subulata
- Ancistrocoma myae
- Ancistrocoma pelseneeri Chatton & Lwoff 1926 ssp. pelseneeri
- Amphileptus carchesi
- Amphileptus claparedeii Stein 1867
- Amphileptus claparedi Stein 1867
- Amphileptus falx
- Amphileptus litonotiformis
- Amphileptus lamella
- Amphileptus fascicola
- Amphileptus meiianus Song & Wilbert 1989
- Amphileptus moliger
- Choanophrya infundibulifera Hartog 1881
- Choanophrya subsessilis
- Neoschneideria douxi
- Chotecella leiotheca
- Caryospora colubrina
- Cerona mytilus
- Cerona lanceolata
- Cerona histrio
- Cerona silurus
- Chaenea tesselata Kahl 1935
- Chaenia crassa
- Chaenia elongata Bütschli 1889
- Chaenia teres Dujardin 1841
- Chaenia vorax Quennerstedt 1867
- Chaetospira cylindracea
- Chaetospira marina
- Chanostoma margaritiferum Daday 1884
- Charon equi
- Charon evagatus
- Charon grayi
- Chasmatostomum reniforme
- Cheissinella enchytraei
- Cheissiniophrya knoeppfleri
- Chelidon uncinatus
- Chilenophrys allendei Jankowski 1986
- Chilodon crebricostatus
- Chilodon megalotrocha
- Chilodon uncinata Ehrenberg 1838
- Chilodon uncinatus ssp. uncinatus
- Chilodonella caudata
- Chilodonella dosrisuprema
- Chilodonella macrostoma
- Chilodonella praestans
- Chilodonella minuta Dragesco 1966
- Chilodonella tripartita
- Chattonella subsalsa
- Cephalorhynchus laticeps
- Ceratidium cuneatum
- Ceratobulimina haueri
- Ceratolithoides kamptneri
- Cercaria cornuta
- Cercaria cyclidium
- Cercaria catellus
- Cercaria gibba
- Cercaria lupus
- Cercaria gyrinus
- Cercaria lemna
- Cercaria ovalis
- Cercaria pleuronectes
- Cercaria seminis
- Cercaria tenax
- Cercaria tricaudata
- Cercaria podura
- Cercaria tripus
- Cercaria varicans
- Cercaria viridis
- Haemogregarina stepanowi
- Chitinoidella bermudezi
- Chitinoidella colomi
- Chitinoidella cubensis
- Chitinoidella dobeni
- Chitinoidella slovenica
- Chitinoidella tithonica
- Chlamidodon mneumosyne
- Chlamydodon mnemosyne Ehrenberg 1835
- Chlamydodon mnemosine Ehrenberg 1835
- Chlamydodon obliquus Kahl 1931
- Chlamydodon pachidermus
- Chlamydonella stricta Deroux 1976
- Chaetospira mülleri Lachmann 1856