Incredibly preserved worm inside a stone nodule, mineralized in iron. The piece is ± 7.6 x 6.2 cm and the worm ± 3.9 x 1 cm.
* Astreptoscolex anasillosus worms are a medium-sized polychaete with round bodies that taper towards the tail. It had an eversible trunk that carried a small set of jaws, as well as gills that are sometimes visible with good preservation. This worm likely had a tough cuticle skin that would explain commonly detailed preservation. The structure of the body suggests that these worms lived a predatory lifestyle.
Carboniferous - Pennsylvanian
Mazon Creeck, Braidwood, Illinois (USA)
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