Naturalist whose subjects of particular interest included barnacles and earthworms (6)

I believe the answer is:

darwin

(Other definitions for darwin that I've seen before include "Natural scientist and Australian city" , "Evolution pioneer" , "Charles . . . . . . who formulated the theory of evolution" , "Evolution scientist and city" , "Author of The Descent of Man" .)

I've seen this clue in The Times.

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