Heat oven to 450°F. With spider-shaped cookie cutter, cut 2 spider shapes from each bread slice. Brush both sides of shapes with 2 tablespoons oil. Place on ungreased cookie sheet.
Bake 4 minutes, turning once, until toasted.
Meanwhile, in small bowl, mix remaining ingredients. Arrange toasted bread on serving platter; spoon tomato mixture on each piece. Serve warm.