30858 - Nicely Preserved 1.45 Inch Harpes perradiatus Lower Devonian Trilobite Crustaceans Sepkoski 2002 and Thurmond 1969

Sepkoski 2002 and Thurmond 1969

3 mm  /  2

Layer upon layer of silica built up within the pocket

CaCO3 (the other forms being the minerals calcite and vaterite)

Asterotheca

30858 - Nicely Preserved 1.45 Inch Harpes perradiatus Lower Devonian Trilobite Crustaceans Sepkoski 2002 and Thurmond 1969Harpes perradiatus, Richter and Richter 1943 Harpes Harpetidae PaleoDB taxon number: 313570 Alternative combination: Helioharpes perradiatus Belongs to Harpes according to M. C. Ebach and K. J. McNamara 2002 Sister taxa: Harpes acuminatus, Harpes dvorcensis, Harpes escoti, Harpes fornicatus, Harpes forojuliensis, Harpes gracilis, Harpes koeneni, Harpes latilimbatus, Harpes macrocephallus, Harpes macrocephalus, Harpes neogracilis, Harpes nymageenensis,