Zygnematales

plural noun
Zyg·​ne·​ma·​ta·​les | \-ˈtā(ˌ)lēz\

Definition of Zygnematales 

: an order of green algae (class Chlorophyceae) that include the pond scums and desmids, are distinguished by the absence of asexual reproduction and lack of flagellated reproductive structure, and reproduce sexually by fusion of amoeboid gametes — compare akontae

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History and Etymology for Zygnematales

New Latin, from Zygnemat-, Zygnema + -ales

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