From Fensome et al., 2019:
Cordosphaeridium? hirundo (Eisenack, 1958a, p.404–405, pl.24, fig.12) Stover and Evitt, 1978, p.147. Emendation: Sarjeant, 1985a, p.76–77, as Achomosphaera hirundo. Holotype: Eisenack, 1958a, pl.24, fig.12. Originally Hystrichosphaeridium, subsequently Achomosphaera, thirdly Lanternosphaeridium, fourthly (and now) Cordosphaeridium?, fifthly Spiniferites?. Lentin and Williams (1989, p.74) questionably retained this species in Cordosphaeridium. Questionable assignment: Stover and Evitt (1978, p.47). NIA. Age: Early Cretaceous.

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Translation, Eisenack, 1958: LPP

Original description: Eisenack, 1958, p.404: Hystrichosphaeridium hirundo
Central shell oval, covered with few, thin and delicate processes, arising from wide bases, clearly bifurcate (Y-shaped) or trifurcate, may be joind by ridges. Pylomes frequent.
Dimensions: Holotype: Shell 83:70 µm, overall 146:138 µm. Other specimens: Shell 54:50-94:70 µm, overall 92:82-146:138 µm.