Polygonium jurassicum sp. Nov., a polygonomorph acritarch from the lower Toarcian (lower jurassic) of the tethyan realm

The acritarch Polygonium jurassicum sp. nov. is proposed for polygonomorph acritarchs with a surface ornament of hollow spines. It is the second species of Polygonium described from Jurassic sediments. Polygonium jurassicum sp. nov. is reported from lower Toarcian sediments from central Italy and northwest Greece; the stratigraphic range is compared with the ammonite and calcareous nannofossil zonations.