The Lightning had included fourth-round and seventh-round picks in their deal with the Flyers to offset Philly taking on the past year of Filppula's contract in 2017-18.
The 31-year-old Bellemare, who has provided an integral presence on the Flyers' penalty kill this season, has collected three goals and as many assists while competing in all 62 games in 2016-17.
Streit, 39, brings instant help to a Penguins blue line that's been battling injuries as they round out the back end of the regular season and prepare for what they hope will be another deep postseason run.
Yzerman send Filppula to Philadelphia along with a fourth- and a seventh-round draft pick for Mark Streit.
Filppula, 32, has seven goals and 27 assists this season.
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When the smoke had cleared, Tampa Bay Lightning general manager Steve Yzerman wouldn't say his team was in better shape for the future.
The Lightning would likely have to sweeten the pot to move Filppula, such as adding a prospect or pick. Filppula's No Movement Clause made him automatically protected in the draft, which ultimately would have left another younger player exposed.
The expectation is Neuvirth will be exposed in June's Expansion draft protecting Anthony Stolarz.
Both the Flyers and Lightning are battling for a playoff spot in the Eastern Conference, as they are four and five points out respectively. They are trying to become the first National Hockey League team to win back-to-back titles since the Red Wings in 1997-98.
Goaltender Peter Budaj was acquired by the team from the Los Angeles Kings on Sunday, in a trade for Ben Bishop and a fifth-round draft pick.
Apparently that team is the Flyers and the move suggests that Steve Mason is not in the Flyers' plans moving forward. He earns $5.25 million this season and is set to become an unrestricted free agent this offseason.