What's the point?

[Bry]

I've noticed a few species' scientific names include quotation marks, most often with the Haplopelma sp. "longipedum". What's the purpose of using these quotation marks?

Bry

 

[Tangled WWWeb]

This is done because there is some question about the legitimacy of that particular name. Usually it has not been officially described by a taxonomist, or it's former name has been made invalid.