Large, well preserved fin spine of extinct Acanthodian fish Machaeracanthus sp. Acanthodian are sometimes called spiny sharks because all fins other than the caudal was supported by massive spines formed of dentine. Locality: Morocco, Aatchana Age: Lower Devonian, Emsian Size: 205 x 83 x 27 mm Spine size: 178 x 24 mm Weight: 650 g If you have bought several items, combined shipping is possible. Please contact me.