plural noun
Cryp·​to·​mon·​a·​da·​les | \ ˌkriptōˌmänəˈdā(ˌ)lēz\

Definition of Cryptomonadales 

: an order of algae that is coextensive with Cryptomonadina and is usually included among the Pyrrophyta or placed in the class Flagellatae

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History and Etymology for Cryptomonadales

New Latin, from Cryptomonad-, Cryptomonas + -ales

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