plural noun
Bac·​il·​la·​ri·​oph·​y·​ta | \-ˈäfətə\

Definition of Bacillariophyta 

in some classifications

: a division of plants coextensive with the class Bacillariophyceae

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First Known Use of Bacillariophyta

1924, in the meaning defined above

History and Etymology for Bacillariophyta

New Latin, from Bacillaria + -o- + -phyta

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The first known use of Bacillariophyta was in 1924

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