Thomas converted to bring the Dragons back to within two converted tries at 13-27 down.
Neath skipper Lee Beach and team-mate James Merriman will join the Wales squad in the United States as will Dragons back Gareth Chapman.
Soon after Fussell got the Dragons back in the game, scoring their first try after beating the Bath defence to a clever kick from Arlidge, who converted to make it 7-8.
While 76-cap Williams has been persuaded back into the international fold, there is no place for veteran Newport Gwent Dragons back-row Colin Charvis, nor his regional colleagues Michael Owen and Ceri Sweeney.
But the Dragons switched back on and Sweeney's late drop-goal was enough to secure five points.
The Dragons hit back with tries from Richard Fussell and Wayne Evans to give the Welsh region a 12-8 lead.
But the Dragons hit back with tries from Matt Cooper and Brett Morris, only for Carmont to score his second.
Upon reaching the top, you emerge from the trees onto a small rocky clearing looking directly onto a long dragons-back-like range of grey snow-capped peaks: the imposing 5, 600m-high Jade Dragon.
The Dragons went back to basics, and a series of short-range forward drives ended with a try for the outstanding Owen, the lock reaching over the top of a pile-up on the Exiles' line.
The Dragons hit back immediately and centre John Wilson ran over the home side's first try of the match as Bosc then converted and then kicked another goal to give the Catalans the lead.
The Dragons' back-rower Joe Bearman could have his Wales hopes thwarted by an abductor problem and may even miss the rest of the season, while there is still no sign of Gavin Henson returning to the rugby field.
Some premature celebrating by Roberts allowed Dragons full-back Martyn Thomas to make up some ground, but his desperate dive proved in vain.
But his effort was disallowed by the TMO after it was adjudged that he held back Dragons wing Gareth Wyatt while chasing the kick ahead.
Yachvili converted and before he added a penalty Dragons full-back Martyn Thomas launched a daring counter-attack that ended in disappointment as he sent out a poor pass.
Saints twice led with tries from Paul Wellens and Francis Meli only for the Dragons to hit back with a devastating burst to lead 24-10 at the break.
That saw the momentum swing back as the Dragons forwards made the most of their extra man to carve out space for Sweeney to cross.
But the Dragons rallied and got themselves back into the game through Martyn Thomas and Andy Williams, only to be let down by Aled Thomas' kicking.
Will Harries, who won his only Wales cap on their summer tour to New Zealand, is full-back at the Dragons, while Blues wings Leigh Halfpenny and Chris Czekaj - called into the squad after Byrne's withdrawal - plus Ospreys rookie Tom Prydie can also play at 15.
Scarlets full-back Morgan Stoddart and Dragons scrum-half Andy Williams are also fresh faces since the Six Nations.
Warrington have been one of the leading teams in the 2011 season, but have suffered back-to-back defeats by Catalan Dragons and Huddersfield, with the Wolves dropping to fourth.
But the Dragons were determined not to be pegged back and were rewarded on 56 minutes when Brew breached the Ospreys defence to go over after patient build-up.
That four-point gap could have been brought back to one when the Dragons were caught offside five metres from their own line, but the Ospreys opted for a scrum instead and wasted their chance.
The visitors were soon on the back foot from an attacking Dragons line-out, the home side driving forward before spreading the ball quickly and accurately across the three-quarter line for Brew to speed in at the corner.
Wing James rubbed salt in the wounds with a fifth home try and ensured that the Dragons' losing streak in Cardiff still stretches back to November 2003.
De Marigny opened the scoring with a third-minute penalty, before the Dragons suffered a blow as captain full-back Kevin Morgan left the field 10 minutes later with a knee injury.
Huddersfield, badly missing star duo Danny Brough and Aussie forward Luke O'Donnell, now know that they will slip back to fifth place if Catalan Dragons, a point behind, beat Warrington in Perpignan on Saturday evening.
When God finally gets tired of waiting it out and decides to end things, the back-and-forth between dragons and serpents and sea monsters and Jesus is less like a scouring of the stables than like a Giants-Patriots Super Bowl.
Richard Mustoe got the Dragons' crucial fourth try but the Italians hit back.
But the Dragons, unbeaten in their last four games, hit back immediately, courtesy of indiscipline from Thorman.
The 22-year-old Dragons forward, who can play in the second and back rows, will be out of action for at least six weeks.
BBC: SPORT | Rugby Union | Rugby World Cup | Team Pages | Wales | Owen out of World Cup
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