Biological categories such as Mollusca and Arthropoda (5)

I believe the answer is:

phyla

(Other definitions for phyla that I've seen before include "Classes immediately below those" , "Divisions in botany" , "whole lot of groups?" , "Divisions in the kingdom" , "Parts of the kingdom" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.