Exochosphaeridium truncatum
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"?truncatum" (Davey, 1969a, p.164-166, pl.7, figs.1-3) Stover and Evitt, 1978, p.154. Emendations: Masure, 1988b, p.129 and Harker and Sarjeant in Harker et al., 1990, p.73-74, both as Pervosphaeridium truncatum. Holotype: Davey, 1969a, pl.7, fig.2; Masure, 1988b, pl.4, figs.6A-B; text-fig.5, nos.1-2. NOW Pervosphaeridium truncatum. Originally Exochosphaeridium striolatum var. truncatum, subsequently Exochosphaeridium striolatum subsp. truncatum, thirdly Exochosphaeridium? truncatum, fourthly (and now) Pervosphaeridium truncatum. Questionable assignment: Stover and Evitt (1978, p.154). Age: Cenomanian.
Parent: Exochosphaeridium
