taxae
Taxae is a term that appears in some Latinized taxonomic texts as a plural form related to the word taxon. In contemporary English-language taxonomy, the widely used plural is taxa. As a result, taxae is considered archaic or idiosyncratic and is rarely encountered in modern scientific writing.
The form taxae arises from Latin grammar, where Latin plurals are often used in older scholarly works
For clarity and consistency, readers and writers should prefer taxa when referring to multiple taxonomic units