Phyllodocida

The Phyllodocida are a family of elongated, active polychaete worms. These marine annelids are characterized by broad, leaf-like appendages called cirri, multiple tentacles on their prostomium (head region), and one or two pairs of eyes. Polychaetes, as a class, are marine worms known for their distinct body segmentation. Most possess parapodia, which are paired, lobelike outgrowths on their body segments that bear setae, or bristles. Phyllodocida are part of the broader group of polychaetes, which includes free-moving (errantia) and tube-dwelling (sedentaria) forms. Some scale worms within the Phyllodocida order engage in commensalism, living in close association with other marine organisms.123