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Cordosphaeridium hirundo
Cordosphaeridium? hirundo (Eisenack, 1958) Stover and Evitt, 1978
Originally Hystrichosphaeridium, subsequently Achomosphaera, thirdly Lanternosphaeridium, fourthly (and now) Cordosphaeridium?, fifthly Spiniferites?.
Stover and Evitt, 1978, considered this to be a provisionally accepted species of Cordosphaeridium.
Sarjeant, 1981, questionably transferred this species to Spiniferites Mantell, 1850. Lentin and Williams, 1985, retained it in Cordosphaeridium.
Sarjeant, 1985, emended the diagnosis of the species and transferred it to Achomosphaera Evitt, 1963. Lentin and Williams, 1989, questionably retained it in Cordosphaeridium.
Holotype: Eisenack, 1958, pl.24, fig.12; Eisenack, 1964, p.24a
Locus typicus: R³dersdorf near Berlin, Germany
Stratum typicum: Early Cretaceous
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.
Originally Hystrichosphaeridium, subsequently Achomosphaera, thirdly Lanternosphaeridium, fourthly (and now) Cordosphaeridium?, fifthly Spiniferites?.
Stover and Evitt, 1978, considered this to be a provisionally accepted species of Cordosphaeridium.
Sarjeant, 1981, questionably transferred this species to Spiniferites Mantell, 1850. Lentin and Williams, 1985, retained it in Cordosphaeridium.
Sarjeant, 1985, emended the diagnosis of the species and transferred it to Achomosphaera Evitt, 1963. Lentin and Williams, 1989, questionably retained it in Cordosphaeridium.
Holotype: Eisenack, 1958, pl.24, fig.12; Eisenack, 1964, p.24a
Locus typicus: R³dersdorf near Berlin, Germany
Stratum typicum: Early Cretaceous
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.