Bianca belongs to Portia Group of moons , which also includes Cressida , Desdemona , Juliet , Portia , Rosalind , Cupid , Belinda and Perdita . Bianca belongs to Portia Group of satellites , which also includes Cressida , Desdemona , Juliet , Portia , Rosalind , Cupid , Belinda and Perdita .