Factbox-Parties and leaders contesting Portugal's snap election

FILE PHOTO: Portugal's Left Bloc (BE) party leader Catarina Martins shouts as she attends a march marking the Carnation Revolution's 43rd anniversary in Lisbon, Portugal April 25, 2017. REUTERS/Rafael Marchante/File Photo

(Reuters) - Portugal will hold a snap parliamentary election on Sunday that is likely to perpetuate political instability.

Following are snapshots of the main parties and leaders contesting the vote: