Surprisingly agile boring invertebrate (11)

I believe the answer is:

globigerina

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'surprisingly agile boring invertebrate' is the definition.
The definition and answer can be both animals as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

This is the entire clue.

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(Another definition for globigerina that I've seen is " Protozoan".)

I've seen this clue in The Sunday Times and The Times.

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