And the winner of the vote for official mascot of the Ugly Animal Preservation Society is...

This guy:

This gives the blobfish the unofficial title of world's ugliest animal.  My personal choice for runner-up would be the pubic lice:

Here's a gallery of the contenders, and here's more information.

More at the BBC:

The blobfish tops a list that includes the huge-nosed proboscis monkey, the similarly afflicted pig-nosed turtle, an amphibian affectionately known as a "scrotum frog" and pubic lice. 

Biologist and TV presenter Simon Watt, president of the Ugly Animal Preservation Society, said he hoped the campaign would draw attention to the threats facing these weird and wonderful creatures.