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Echinozoans through time

Volchovia volborthi (Ophiocistioidea), Kunda Horiz, Darriwilian, Lower Ordovician, Lava River, E of St Petersburg region, Russia Bromidechinus rimaporus Smith & Savill 2001 (topotype), 35 mm. Poolville Member, Bromide Formation, Dunn Quarry. Bromidechinus with interambulacra shaded Bothriocidaris kolatai Kier 1982, 15 mm complete, free of matrix. Poolville Member, Bromide Formation, Dunn Quarry.
Palaeocucumaria hunsrueckiana Lehman 1958, 80 mm long Palaeocucumaria hunsrueckiana Lehman 1958, 80 mm long Palaeocucumaria hunsrueckiana Lehman 1958, 80 mm long Hyattechinus pentagonus Jackson 1912, a proterocidarid echinoid, Upper Devonian, Pennsylvania
Pholidocidaris irregularis, 11.5 cm across, Edwardsville formation, near Crawfordsville, Indiana. Lepidocidaris squamosa Meek & Worthen 1873 with Taxocrinus sp, Lower Carboniferous, Warsaw Formation, Adams County, Illinois Archaeocidaris brownwoodensis, 18 cm spine tip to spine tip, Upper Carboniferous, Brownwood Spillway, Texas Achistrum wheeleri, 9 cm holothurian, Francis Creek Shale, Upper Carboniferous. Pit 11, Peabody Coal Mine, Braidwood, Illinois

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