30858 - Nicely Preserved 1.45 Inch Harpes perradiatus Lower Devonian Trilobite Crustaceans Lieberman 2008

Lieberman 2008

Asterotheca

Layer upon layer of silica built up within the pocket

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

Sepkoski 2002 and Thurmond 1969

30858 - Nicely Preserved 1.45 Inch Harpes perradiatus Lower Devonian Trilobite Crustaceans Lieberman 2008Harpes 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,