On Sunday, Minnesota wide receiver Adam Thielen had more catches and yards in a win over the Jets than the 49ers’ wide-receiver corps did in a loss to the Rams.

That’s notable.

And, unfortunately for the 49ers, it’s not unusual.

After seven games, Thielen (67 receptions, 822 yards) is outproducing the 49ers’ wideouts (64, 798), who are on pace to have 24 fewer yards than Jerry Rice did in his 1,848-yard season in 1995.

On Sunday, in a 39-10 loss to the Rams, the receivers had four catches for 35 yards.

“The numbers may be low,” said wide receiver Marquise Goodwin of the 2018 production, “... but we’ve just got to control what we can control and continue to work and get open for our quarterback.”

The quarterback Sunday, of course, was backup C.J. Beathard. It’s still worth noting the receivers weren’t exactly flourishing in Jimmy Garoppolo’s three starts. In Week 2, for example, wideouts had six catches for 96 yards in a win over the Lions and Garoppolo took six sacks, partly because they couldn’t get open.

“I see a lot of potential,” head coach Kyle Shanahan said of his wide receivers. “I think all of our guys are NFL players and can all be used differently. When I say NFL players, I mean they’re guys who I think are capable of playing on any team.

“I don’t know how high the ceiling is and where they can go. That’s up to them and it’s up to us helping them. I think it has been tough because I feel like we’ve had a little bit of a different lineup every single game.”

The 49ers’ top four wide receivers have dealt with injuries.

Goodwin (11 receptions, 204 yards), their No. 1 wideout, played just 96 snaps in the first five games because of thigh and hamstring ailments. Slot receiver Trent Taylor (17, 131) has missed a game with a back injury tied to offseason surgery that could help explain his slow start. Rookie second-round pick Dante Pettis (3, 96) hasn’t played an offensive snap in the past four games because of a knee injury, although he is on track to play Sunday at Arizona.

Finally, Pierre Garcon, 32, who ranks eighth among active players in career receptions, has been playing with a knee injury he sustained in a loss to the Cardinals on Oct. 7. On Wednesday, Shanahan said Garcon probably would be doubtful to play Sunday to give him chance to heal after he had 1 catch for 5 yards against Los Angeles.

“I was expecting him to come on pretty strong here in the recent weeks,” Shanahan said, “but he’s definitely been battling through some tough stuff here the last two weeks.”

Still, Garcon wasn’t having a memorable 2018 before his injury. He’s on pace for a 48-catch, 525-yard season, which would be his lowest totals in a full season in his 11-year career. The 49ers have the 2019 option on his contract, which includes a $5.65 million base salary.

It’s not clear whether Garcon is in their 2019 plans, but Goodwin, Pettis and Taylor figure to remain on the roster.

Given that, the 49ers hope to get a better evaluation of the three in their final nine games.

They would be encouraged if Goodwin can stay healthy. He earned a three-year, $20.3 million extension in the offseason after he played in 16 games in his 2017 breakout season. However, his ability to stay on the field was an aberration: In his other five seasons, including 2018, Goodwin has missed 27 of 71 games.

Meanwhile, the 49ers hope Pettis can show why he was worth trading up 15 spots to select him with the No. 44 overall pick. And Taylor can establish whether he’s a dynamic slot receiver, or a role player.

“Our guys have been up and down,” Shanahan said of the receivers. “Our guys have been battling injuries.”

Actually, his guys have been mostly down. And that explains why they are, statistically speaking, looking up at Thielen.

Eric Branch is a San Francisco Chronicle staff writer. Email: ebranch@sfchronicle.com Twitter: @Eric_Branch