Williams, Lentin and Fensome 1998 - Lentin and Williams Index of Fossil Dinoflagellates

Achomosphaera hirundo, (Eisenack, 1958a, p. 404-405, pl.24, fig.12), Davey and Williams, 1969, p. 4; Emendation: Sarjeant, 1985a, p. 76-77

NOW Cordosphaeridium?. Originally Hystrichosphaeridium, subsequently Achomosphaera, thirdly Lanternosphaeridium, fourthly (and now) Cordosphaeridium?, fifthly Spiniferites. This combination was not validly published in Davey and Williams (1966b, p.104), since these authors did not fully reference the basionym. N.I.A.

Holotype: Eisenack, 1958a, pl.24, fig.12.
Locus typicus: Roedersdorf near Berlin, Germany
Stratum typicum: ?Aptian
Age: Early Cretaceous

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Original description: [Eisenack, 1958, p. 404] (Translation: LPP):

Description:
Central shell oval, covered with few, thin and delicate processes, arising from wide bases, clearly bifurcate (Y-shaped) or trifurcate, may be joined 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.