Being part of a team means that you do your fair share of the work. It doesn't mean that you have the right to sit at your laptop and say you're not doing it because you basically can't be bothered. The work needs to be done very very soon, and I'm sat here working my ass off already, and now by the sound of it we're going to have to do even more because you don't have the motivation to do any yourself.
It's difficult, you knew that going in. But you have absolutely no right to just say you're not doing it.
There's no 'i' in team.
There is, however, a 'u' in CUNT.