WordPress Comment cannot be deleted

Hi, i had a comment yesterday which just says

Anonymous

Submitted on 2012/01/06 at 5:33 pm

and the gravatar, when clicked, goes to https://en.gravatar.com/false

There is no “tick box” next to the comment to delete it! This has never happened before and only 2 days ago i installed a capcha plugin. Any idea how i can delete the comment?
Thanks