Downiesphaeridium polyacanthum
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"polyacanthum" (Gitmez, 1970, p.284–286, pl.12, fig.10; text-fig.22) Islam, 1993, p.84. Holotype: Gitmez, 1970, pl.12, fig.10; text-fig.22b; Fauconnier and Masure, 2004, pl.23, figs.6–7. Originally Cleistosphaeridium, subsequently Cleistosphaeridium?, thirdly Downiesphaeridium. Taxonomic senior synonym: Hystrichosphaeridium (now Impletosphaeridium?) polytrichum, according to Masure in Fauconnier and Masure (2004, p.196). Taxonomic senior synonym: Baltisphaeridium (as Cleistosphaeridium) iaculigerum, according to Brenner (1988, p.42) — however, neither Islam (1993, p.84), who retained Downiesphaeridium polyacanthum, nor Masure in Fauconnier and Masure (2004, p.196) followed this synonymy. Age: early Kimmeridgian.
Parent: Downiesphaeridium