|Pentremites sp. / Hardin County, Kentucky|
Blastoids are an extinct type of stemmed or stalked suspension feeding echinoderms, sometimes referred to as "sea buds."
They made a living feeding on planktonic organisms that inhabited our ancient seas from shelf to basin. Their lineage dates back to the Ordovician and died out at the end of the Permian, about 250 million years ago. This little guy measures 10mm top to bottom and 5mm at his widest.