Crossword Genius

Extinct marine arthropod abundant in Palaeozoic times (9)

Ross

I believe the answer is:

trilobite

(Other definitions for trilobite that I've seen before include "find on Lyme Regis beach?" , "Fossil arthropod" , "Extinct arthropod" , "Extinct animal" , "one in rock" .)

I've seen this clue in The Mirror.
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