Mazon Creek Polychaete Worm Pieckonia helenae
Time: Pennsylvanian (~300 m.y.a.)
mm long on a 48 mm by 60 mm and 47 mm by 33 mm nodule pair
Site: Mazon Creek, Pit 11, Francis Creek shale, Braidwood, Illinois
Polychaeta (Bristleworms) have a diverse representation among Mazon
Creek fossils. The segmented bodies of the Polychaeta have paired
lobes called parapodia that have a function in locomotion or respiration.
The parapodia have numerous bristles that are the source of the
name of the class (Polychaeta means many bristles). This one is
thought to have been a predatory species, as are many modern-day
bristleworms, due to the fact that some have been found with the
remains of Ostacods in the gut. This fossil worm comes from an old
collection that has the field collector’s inventory number.
fossil pictures to enlarge