Hyolithid Hyolithes idahoensis? (Resser, 1938)Middle CambrianSpence ShaleBox Elder CountyUtahUSACambrian Hyolitha Hyolithes idahoensis? Spence ShaleSKU: TDI27130,00 €PrezzoEsauritoTechnical data:size: slab 9 cm x 6,8 cm Positive and Negative Hyolithid 2,1 cm restorations: NO RESTORATIONS preparator: Di Silvestro Gianpaolo ref. Wikipedia : Hyoliths are animals with small conical shells, known as fossils from the Palaeozoic Era. They are lophophorates, a group which includes the brachiopods.