| CLAS | a former classification |
|---|---|
| CLAS | coelenterates in which the polyp stage is absent or at least inconspicuous: jellyfishes |
| CLAS | horsetails and related forms |
| CLAS | strictly parasitic protozoans that are usually immobile |
| CLAS | the organization of classes within a society |
| CLAS | conflict between social or economic classes (especially between the capitalist and proletariat classes) |
| CLAS | small class of minute arthropods |
| CLAS | in some classifications considered a separate phylum: microscopic arachnid-like invertebrates living in water or damp moss having 4 pairs of legs and instead of a mouth a pair of stylets or needle-like piercing organs connected with the pharynx |
| CLAS | yews: in some systems classified as a class (Taxopsida) and in others as a subdivision (Taxophytina) used in some classifications for one of five subdivisions of Gymnospermophyta |
| CLAS | ctenophores have retractile tentacles |
| CLAS | small class of free-swimming tunicates |
| CLAS | category used in some systems to comprise the two orders Ustilaginales (smuts) and Uredinales (rusts) |