| CLA | a class of Annelida |
|---|---|
| CLA | sometimes classified as an order: sea squirts |
| CLA | large class of higher fungi coextensive with division Ascomycota: sac fungi |
| CLA | sea stars |
| CLA | birds |
| CLA | marine and freshwater eukaryotic algae: diatoms |
| CLA | large class of higher fungi coextensive with subdivision Basidiomycota |
| CLA | oysters |
| CLA | true mosses: bryophytes having leafy rather than thalloid gametophytes: comprises orders Andreaeales |
| CLA | octopuses |
| CLA | tapeworms |
| CLA | in some classifications: contains only the order Charales |