WASHINGTON — The 116th Congress opened on Thursday with Democrats taking control of the House. Representative Nancy Pelosi, Democrat of California, was elected speaker.

To win back the gavel, Ms. Pelosi defused a rebellion in her caucus. She ultimately consented to a series of agreements to secure enough support, including limiting herself to four years as speaker.

But on Thursday, there were still some dissenters within her Democratic ranks who did not vote for Ms. Pelosi. They included:

Freshmen: Anthony Brindisi of New York, Jason Crow of Colorado, Joe Cunningham of South Carolina, Ben McAdams of Utah, Max Rose of New York, Mikie Sherrill of New Jersey, Elissa Slotkin of Michigan, Abigail Spanberger of Virginia, Jeff Van Drew of New Jersey and Jared Golden of Maine.

Relative newbie: Conor Lamb of Pennsylvania. (Mr. Lamb won a special election last year; this will be his first full House term.)