A re‐appraisal of the genusChytroeisphaeridiaSarjeant 1962

Abstract

A study of Chytroeisphaeridia chytroeides Sarjeant 1962, the type species of the genus, from the type locality indicates that the archaeopyle is precingular in position and not apical as originally defined. The generic diagnosis of Chytroeisphaeridia is therefore emended and the species previously assigned to this genus are reassessed — C. dictydia, C. euteiches and C. reticulata are transferred to Batiacasphaera; C. variabilis is transferred to Gonyaulacysta; and C. pocockii is transferred to Lithodinia. The genus Tapeinosphaeridium is considered to be a junior synonym of Chytroeisphaeridia and the type species, T. pericompsum, is transferred to the latter genus; ?T. granulatum is tentatively transferred to Tectatodinium.