Thornton is the Sharks' all-time leader in assists (780), is second in games (1,034) and points (1,024), and is third in goals (244). He was San Jose captain from 2010-14 and was an alternate captain the past four seasons.
"He's a good friend to all these guys in here," Thornton said of Pavelski. "He was a great captain. We're definitely going to miss him. ... We've got to move on, but he was a great Shark and it was an honor to play with him."
The other NHL teams without a captain are the Carolina Hurricanes, Detroit Red Wings, New York Rangers, Ottawa Senators, Toronto Maple Leafs, Vancouver Canucks and Vegas Golden Knights.