Phyllodocidae (polychaetes) from Belize are reported. Eight species are treated in detail. Of these, 3 are newly described
Eumida muriatica,
Sige belizensis, and
Nereiphylla mimica.
Pterocirrus foliosus (Treadwell, 1924) is redescribed and the identities of
Hesionura elongata (Southern, 1914),
Mystides borealis Théel, 1879, and
Phyllodoce erythrophylla (Schmarda, 1861) are discussed. Eight additional species are recognized, but not treated in detail due to the lack of sufficient material. Together with the previously recorded
Phyllodoce panamensis Treadwell, 1917, 17 species are now known from Belize.