| CLAS | extinct group of bony-plated fishes with primitive jaws |
|---|---|
| CLAS | class of fungi in which the fruiting body is a cleistothecium (it releases spores only on decay or disintegration) |
| CLAS | marine annelid worms |
| CLAS | small class of marine mollusks comprising the chitons |
| CLAS | whisk ferns |
| CLAS | whisk ferns |
| CLAS | extinct gymnosperms most of Carboniferous to Jurassic: seed ferns and allies |
| CLAS | class of fungi in which the fruiting body is a perithecium |
| CLAS | class of cold-blooded air-breathing vertebrates with completely ossified skeleton and a body usually covered with scales or horny plates |
| CLAS | coextensive with the Rhodophyta: red algae |
| CLAS | characterized by the formation of pseudopods for locomotion and taking food: Actinopoda |
| CLAS | small class of bilaterally symmetrical marine forms comprising the tooth shells |