Polygordius

Polygordius is a genus of marine annelid worms belonging to the class Polychaeta. These worms are slender, cylindrical, and have many segments, though their segmentation is not externally obvious. They are part of the family Polygordiidae.12

Polychaetes, as a class, are segmented worms found in nearly all marine habitats. They are characterized by having paired, lobelike outgrowths called parapodia on most body segments, which bear tiny bristles called setae. Polychaetes vary greatly in size and appearance, with some being free-moving (errantia) and others living in tubes (sedentaria). They play a significant role in marine ecosystems by processing bottom sediments.32