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Robert Pratta / Reuters
Totmyanina and Marinin in Lyon
The Russian duo beat Germany's Aliona Savchenko and Robin Szolkowy by 7.79 points. Two-time former champions Maria Petrova and Alexei Tikhonov of Russia finished third.
Totmyanina and Marinin established themselves as clear favorites for the Olympic pairs crown at next month's Turin Games with a combined total of 195.87.
Their victory also extended Russia's winning streak in the discipline to 11 years.
Having carried forward a lead of 1.97 points from Tuesday's short program, Totmyanina and Marinin were the only couple among the medal contenders who appeared to perform a near-flawless free skate.
They opened their four-minute free program with triple Salchows before five more jumps and throws followed to the thundering beats of "Romeo and Juliet."
The Russians also executed three imaginative lifts to perfection to ensure their European swansong ended on a winning note.
The Chicago-based pair, who will retire from competition after the Olympics, finished their routine with their arms draped around each other before acknowledging a large contingent of Russian fans.
"We didn't skate 100 percent, but it was good enough to win our fifth European title in a row and we're happy about that," Marinin told reporters.
Totmyanina added the pair had made an error but they improvised to avoid being penalized.
"We made a small mistake, but it was better to do it here rather than at the Olympics," said Totmyanina, who spent a night in the hospital two weeks ago with gall bladder problems.
"I'm looking forward to the Olympics, and provided our health is alright, we'll be ready."
Ukrainian-born Savchenko, who recently acquired German citizenship, and Szolkowy won their first medal at a major competition after leapfrogging Petrova and Tikhonov with the final performance of the day.
Savchenko put her hands down on the ice twice as she struggled to hold her balance after stumbled landings, but despite the errors, the German duo earned 188.08.
Petrova and Tikhonov paid the price for a mistake early in their routine and were awarded a score of 187.04.
Tikhonov's over-rotation on a triple Salchow effectively ended any hopes of ending Totmyanina and Marinin's domination of the discipline.
Irina Slutskaya glided closer to a record seventh European women's title by seizing a commanding lead over fellow Russian Yelena Sokolova with an enthralling short program earlier in the day.
Slutskaya, aiming to eclipse the record of six European titles she shares with Germany's Katarina Witt and Norway's Sonja Henie, executed a series of soaring jumps and artistic spins to outclass her rivals with a segment score of 66.43 points.
The world champion will take a lead of 5.55 points over perennial underachiever Sokolova into Thursday's free skate.
"I'm not thinking about records because this is a hard enough competition without having to deal with any added pressure," Slutskaya said.
