Marvel notched its 12th straight no. 1 debut at the box office with “Ant-Man” opening with $57.2 million. While slightly below previous stand-alone superhero films for Marvel, “Ant-Man,” starring Paul Rudd, is one of the comic book studio’s lesser known heroes. “Ant-Man” took over the top spot from Universal’s popular spinoff “Minions,” which made $49.3 million in its second week. Amy Schumer’s “Trainwreck” also opened strongly, earning $30 million and a lot of buzz for the comedian’s big-screen debut.