Petalocrinus is a genus of primarily cladid cyathocrininid sea lily of the superfamily Gasterocomacea that lived during the Silurian period. Fossils of the numerous species have been found in Silurian strata in North America, England, Sweden, and China, where they underwent a speciation event during the early Late Silurian that gave rise to Sinopetalocrinus and Spirocrinus Image:Mantell's Iguanodon restoration.jpg This article is a . You can help My English Wiki by expanding it.