1. German naturalist whose speculations that plants and animals are made up of tiny living 'infusoria' led to the cell theory (1779-1851)
   - Oken, Lorenz Oken, Okenfuss

Type of: natural scientist, naturalist

• family Cynipidae
• family Cynocephalidae
• family Cynoglossidae
• family Cyperaceae
• family Cypraeidae
• family Cyprinidae
• family Cyprinodontidae
• family Cyrilliaceae
• family Dacninae
• family Dacrymycetaceae
• family Dactylopiidae
• family Dactylopteridae
• family Dactyloscopidae
• family Danaidae
• family Dasyatidae
• family Dasypodidae
• family Dasyproctidae
• family Dasyuridae
• family Dasyurinae
• family Daubentoniidae
• family Davalliaceae
• family Delphinidae
• family Dematiaceae
• family Dendrocolaptidae
• family Dennstaedtiaceae