English Jurassic dinoflagellate cysts and acritarchs: A reexamination of some type and figured specimens

Abstract

Abstract As a consequence of advances in knowledge of the morphology and relationships of dinoflagellate cysts and acritarchs and increasing sophistication in optical equipment, earlier descriptions of dinoflagellate cysts and acritarchs are in general obsolete; re‐descriptions are necessary to furnish fuller morphological information. In this paper are given the results of a reexamination of holotypes or figured specimens of 26 species of dinoflagellate cysts and 3 species of acritarchs, all from the Middle to Upper Jurassic (lower Callovian to Kimmeridgian) of England. The new species Gonyaulacysta setcheyensis and the new combination Acanthaulax downiei (Sarjeant) are proposed; two species, Heslertonia teichophera (Sarjeant) and Meiourogonyaulax? acanthosphaera (Sarjeant), are generically reassigned and emended; and the diagnosis of Leptodinium mosaicum (Downie) is emended. It is demonstrated that the genera Netrely‐tron Sarjeant and Paranett‐elytron Sarjeant do indeed possess an endoblast and are thus...