A remarkable new halichondrid demosponge, Ptilospongia hemisphaeroidalis, from the latest Ordovician Beigong Biota, South China
A new halichondrid demosponge bubarid Ptilospongia hemisphaeroidalis gen.et sp.nov.is described from the latest Pill Crushers and Cutters Ordovician Beigong Biota in Jingxian County, Anhui Province, South China.The new taxon is well-preserved with a two-layer choanosomal skeleton structure (basal layer and erect monactines layer) and three differen