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Hystrichosphaeridium heteracanthum
Hystrichosphaeridium heteracanthum Deflandre and Cookson 1955, p.276; Emendation: Radmacher et al., 2014, p.33,36, as Heterosphaeridium heteracanthum.
NOW Heterosphaeridium. Originally Hystrichosphaeridium, subsequently Baltisphaeridium (acritarch), thirdly Cleistosphaeridium, fourthly (and now) Heterosphaeridium, fifthly Heterosphaeridium?
Holotype: Deflandre and Cookson, 1955, pl.2, fig.5; Fauconnier and Masure, 2004, pl.35, figs.7–8.
Locus typicus: Victoria, Australia
Stratum typicum: ?Late Cretaceous-Early Eocene
Original description: Deflandre and Cookson, 1955, p. 276
Shell large, approximately circular in outline, with numerous appandages of variable size, shape and form. Appandages solid, usually elongated, frequently filiform, sometimes as beoad as long, the apices either pointed, everted, or irregulary branched. Surface of shell punctate.
Dimensions: Shell 56-107 µm, appandages 5-36 µm long (majority between 13 and 23 µm).
NOW Heterosphaeridium. Originally Hystrichosphaeridium, subsequently Baltisphaeridium (acritarch), thirdly Cleistosphaeridium, fourthly (and now) Heterosphaeridium, fifthly Heterosphaeridium?
Holotype: Deflandre and Cookson, 1955, pl.2, fig.5; Fauconnier and Masure, 2004, pl.35, figs.7–8.
Locus typicus: Victoria, Australia
Stratum typicum: ?Late Cretaceous-Early Eocene
Original description: Deflandre and Cookson, 1955, p. 276
Shell large, approximately circular in outline, with numerous appandages of variable size, shape and form. Appandages solid, usually elongated, frequently filiform, sometimes as beoad as long, the apices either pointed, everted, or irregulary branched. Surface of shell punctate.
Dimensions: Shell 56-107 µm, appandages 5-36 µm long (majority between 13 and 23 µm).