Gadfly n. : Any dipterous insect of the genus Oestrus, and allied genera of botflies.

Example:
How can Gadfly's comments be so good he did not even state the riddle correctly?

Taxonomy
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Defination from the web:
Gadfly, a type of fly typically belonging to either the family Tabanidae (Horse-fly) or Oestridae (Botfly) Social gadfly, a person who upsets the status quo ... Gadfly Online, an online and print magazine. HMS Gadfly, four ships of the Royal Navy ...