Mazon Creek Crustacean Fossil Acanthotelson with Dorsal Preservation

Acanthotelson stimpsoni

Subphylum: Crustacea, Class Malacostraca, Subclass Eumalacostraca, Superorder Syncarida

Geological Time: Pennsylvanian (~300 m.y.a.)

Size (25.4mm=1 inch): 25 mm long Matrix: 39 mm by 40 mm.

Fossil Site: Francis Creek Formation, Mazon Creek, Pit 11, Francis Creek Shale, Braidwood, Illinois

Mazon Creek Fossil AcanthotelsonThis specimen is of a genus that had a well-sclerotized cuticle, enabling fine preservation with well differentiated segmental rings. The styliform telson is also very distinctive. This fossil is preserved dorsally, giving an exceptional view of creatures legs and antennae.

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