Description
Synziphosurine
Early Ordovician (Arenigian)
Upper Fezouata Formation
Zagora, Draa Valley
Morocco
Unlike modern horseshoe crabs, synziphosurines lacked the large horseshoe shaped shell and specialized tail spine seen today. Their body plan retained many primitive features, with multiple overlapping segments and a streamlined form suited for life along the ancient seafloor.
40mm positive on 108mm x 65mm slab
