Oligosphaeridium minus
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minus Jiabo, 1978, p.72, pl.26, figs.5–6. Holotype: Jiabo, 1978, pl.26, fig.6. Originally Oligosphaeridium, subsequently (and now) Oligosphaeridium?. Questionable assignment: Fauconnier and Cornu in Fauconnier and Masure (2004, p.404) as a problematic species; however, He Chengquan et al. (2009, p. 116) included this species in Oligosphaeridium without question. Taxonomic junior synonyms: Oligosphaeridium panjinense and Bipolaribucina pusilla, both according to He Chengquan et al. (2009, p. 116). N.I.A. Age: Early Tertiary.
Parent: Oligosphaeridium