Lost World of Fanged Frogs and Giant Rats
pilsner.urquell writes "40 previously unidentified species were discovered inside the crater of an extinct volcano on Papua New Guinea. The finds include a hairy caterpillar, an iridescent beetle, a striped possum, and what may be the world's largest rat — the size of a 'well-fed cat,' and showing no fear of man. The extinct volcano Mount Bosavi last erupted more than 200,000 years ago." There are also an audio interview with the expedition leader and a gallery with 15 photos of the new species.
The newly discovered Giant Rat was wiped out by a swarm of XP farmers.
Jungle Spider
A quick google / wiki couldn't give me any deep information about a "jungle spider". Is that guy really holding an unknown species of spider with his bare hands? That's pretty ballsy.
Do newly discovered ecosystems also represent new ecosystems of viruses, bacteria and diseases?
Here...
The first thing that crossed my mind is that all these species are localized to one particular area and hence rather vulnerable if the environment changes in any way.
You only need to introduce 1 badly chosen predator and its the Stephens Island Wren all over again.
There was a fake article about such an animal years ago on thedailymash (an English satire online publication). The article can be found here. It's shocking how accurately satire can sometimes describe future events :)
Don't hang your head, you're exposing your neck to assault!
It may not be exactly what you are thinking... at least it wasn't what I was thinking
http://www.greenexpander.com/wp-content/uploads/2007/10/new-species-tree-kangaroo.jpg