They didn't list any alternates. However, I'm sure there are a few. All 5 of the riders listed above are on the team.
Remember, at the Olympics, it's 5 team members -- best 3 scores count.
At the WEG it's 4 team members (best 3 scores count) PLUS 2 additional individual riders.
No individuals at the Olympics -- all riders are on the team.
"Fifteen minutes of excellent work is better than an hour and a half of wandering aimlessly around." -Col. Bengt Ljundquist