Camptostroma roddyi (Hundt, 1939). Kinzer formation, Bonnia-Olenellus Zone, early Cambrian. Found in Lancaster County, Pennsylvania, US. Bought as Ebay purchase. This animal is about 4cm in diametre.
An early Cambrian echinoderm that is called a stem echinoderm as it is said that many types of echinoderms arose from this animal. This species is the only animal in the family of its own, Camptostromatoidea.