†Plethysyrinx Sarjeant 1981

Sarjeant 1981. A restudy of some dinoflagellate cyst holotypes in the University of Kiel collections. 2. The Eocene holotypes of Barbara Klumpp (1953); with a revision of the genus Cordosphaeridium Eisenack, 1963. Meyniana, 33 1981: 97-132