Articles | Volume 8, issue 1
J. Micropalaeontol., 8, 109–112, 1989
https://doi.org/10.1144/jm.8.1.109
J. Micropalaeontol., 8, 109–112, 1989
https://doi.org/10.1144/jm.8.1.109

  01 Jun 1989

01 Jun 1989

Rotosphaeropsis thula (Davey 1982) comb. nov., emend.: a dinoflagellate cyst from the Upper Jurassic-Lower Cretaceous of England

James B. Riding1 and Roger J. Davey2 James B. Riding and Roger J. Davey
  • 1British Geological Survey, Keyworth, Nottingham NG12 5GG
  • 2The Robertson Group plc, Llandudno, Gwynedd LL30 1SA

Abstract. The Upper Jurassic-Lower Cretaceous dinoflagellate cyst Cannosphaeropsis thula Davey 1982 does not conform to the morphological parameters of the genus Cannosphaeropsis O. Wetzel 1933 emend. Duxbury 1980. The species also exhibits no indications of belonging to the Spiniferites complex of Evitt (1985). The species is transferred to Rotosphaeropsis Davey 1987 by virtue of its shape, archaeopyle type, processes and trabeculae and the specific diagnosis is emended in the light of this reassessment.