Downiesphaeridium iaculigerum

iaculigerum (Klement, 1960, p.57-58, pl.7, fig.10) Williams et al., 1998, p. 203.  Emendation: Sarjeant, 1984a, p.171, as Operculodinium? iaculigerum.  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.  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.  Age: mid Kimmeridgian.

Parent: Downiesphaeridium