DEARBORN, Mich. — Sometime this week, the assembly line at a Ford plant near Atlanta will come to a halt, signaling the end of a family sedan so revolutionary that its 1985 debut forever changed the way cars look, feel and drive.

Say goodbye to the Taurus.

After 21 years and sales of nearly 7 million cars, Ford Motor Co. is giving up on what some call the most influential automobile since Henry Ford's Model T. The Taurus is credited with moving America away from boxy V-8-powered gas-guzzling bedrooms-on-wheels to aerodynamic, more efficient cars with crisper handling.

To many, the Taurus' death was slow and painful as Ford in recent years has abandoned the car that saved the company, focusing instead on high-profit trucks and sport utility vehicles.

"When that thing came out, it was a big deal," said Robert Thompson, a professor of popular culture at Syracuse University. "It so much became kind of the template of what a modern car was going to look like."

The Taurus, so futuristic that critics called it a "jellybean" and a "flying potato," made its debut late in 1985, with 1979 gasoline shortages still fresh in consumers' minds. The U.S. economy was just pulling out of a downturn when the scalloped Taurus, initially equipped with V-6 and four-cylinder engines, hit showrooms. It was an immediate hit, with buyers snapping up more than 263,000 in 1986, its first full year on the market.

It became the best-selling car in America in 1992 with sales of nearly 410,000, unseating the Honda Accord just as Japanese imports were starting to take hold in the U.S., and it held the top spot for five straight years until it was supplanted by the Toyota Camry in 1997. Even near death in September, it remained Ford's top-selling car.

Ford also has sold 2 million Mercury Sables, the Taurus' nearly identical twin.

"It was really the last full-size American passenger sedan to dominate the segment," said Jim Sanfilippo, a senior analyst for Bloomfield Hills-based Automotive Marketing Consultants Inc.

Ford was losing billions in the early 1980s when the Taurus was just an idea. Philip Caldwell, chief executive at the time, challenged designers and engineers to come up with a radically different car that would return Ford to profitability.

"We were in terrible condition financially," recalled Jack Telnack, chief designer on the original Taurus, who retired in 1998. "He said, 'Look, we need something really different, really new, that will kind of set the pace out there.' "

Nearly 1,000 people worked on the car, many coming from Ford's European operations. They had spotted a trend of U.S. buyers moving away from big, cushy cars to better-handling European models, Telnack said.

Engineers met that trend with a stiffer suspension, and also gave the car more interior room, firmer seats, better ergonomics and more trunk space.

The car also had a lot of new "surprise and delight" features, including a cargo net to hold grocery bags in the trunk and rear-seat headrests and heat ducts, said Joel Pitcoff, the Taurus' marketing manager at the time.

The car's sales remained strong until it got a makeover in 1996. Although the second version sold well, it never matched the original's numbers.

Frank Ribezzo, a lawyer in North Smithfield, R.I., is selling a 1997 Taurus for $950 after running up 210,000 miles. It's his third Taurus, with the first two going over 220,000 miles. Ribezzo said he buys them used because they don't cost much and, save for the transmissions, they're reliable.

"As far as used cars, their value just goes to hell in a handbasket in a couple of years. But they run," Ribezzo said.

In the late 1990s, Ford focused on high-profit trucks and sport utility vehicles, leaving the car almost unchanged for 10 years with little advertising support. In the meantime, competitors had copied the Taurus and refined their models, and the Taurus eventually became solely a rental car and fleet vehicle.

"It didn't keep pace. That's the whole story in four words," said Pitcoff.

Ford, left with few desirable cars, was caught flat-footed this year when consumer tastes shifted away from trucks. Sales have dropped 8.6 percent through September, and the company lost $1.4 billion in the first half of the year.

"They put no money into that product for the last several years," Telnack said of the Taurus. "They just let it wither on the vine. It's criminal. The car had a great reputation, a good name."