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Downiesphaeridium iaculigerum
Downiesphaeridium iaculigerum (Klement, 1960, p.57-58, pl.7, fig.10) Williams et al., 1998, p. 203. Emendation: Sarjeant, 1984a, p.171, as Operculodinium? iaculigerum.
Originally Baltisphaeridium (Appendix A), subsequently Operculodinium?, thirdly Cleistosphaeridium, fourthly (and now) Downiesphaeridium.
Taxonomic junior synonym: Cleistosphaeridium? polyacanthum, according to Brenner (1988, p.42) - however, Islam (1993, p.84) retained Cleistosphaeridium? (as Downiesphaeridium) polyacanthum.
Holotype: Klement, 1960, pl.7, fig.10; Sarjeant, 1984a, pl.2, fig.5; text-fig.7; Brenner, 1988, pl.14, fig.7; Fauconnier and Masure, 2004, pl.23, figs.4-5.
Age: mid Kimmeridgian.
Originally Baltisphaeridium (Appendix A), subsequently Operculodinium?, thirdly Cleistosphaeridium, fourthly (and now) Downiesphaeridium.
Taxonomic junior synonym: Cleistosphaeridium? polyacanthum, according to Brenner (1988, p.42) - however, Islam (1993, p.84) retained Cleistosphaeridium? (as Downiesphaeridium) polyacanthum.
Holotype: Klement, 1960, pl.7, fig.10; Sarjeant, 1984a, pl.2, fig.5; text-fig.7; Brenner, 1988, pl.14, fig.7; Fauconnier and Masure, 2004, pl.23, figs.4-5.
Age: mid Kimmeridgian.