Adnatosphaeridium aemulum
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"aemulum" (Deflandre, 1939a, p.187–189, pl.9, fig.12; pl.10, figs.5–8; pl.11, figs.1,7) Williams and Downie, 1969, p.17. Emendation: Below, 1982b, p.139–140, as Rigaudella aemula. Holotype: Deflandre, 1939a, pl.11, fig.1; Eisenack and Kjellström, 1972, figure to left on p.43; Fensome et al., 1995, fig.1 — p.1473, fig.2 — p.1477. NOW Rigaudella. Originally Hystrichosphaeridium, subsequently Cannosphaeropsis, thirdly Adnatosphaeridium, fourthly (and now) Rigaudella. Taxonomic junior synonym: Cannosphaeropsis paucispina, according to Below (1982b, p.139). This combination was not validly published in Williams and Downie (1966c, p.218), since these authors did not fully reference the basionym. Age: Oxfordian.
Parent: Adnatosphaeridium
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