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Heterosphaeridium heteracanthum ssp. heteracanthum
Heterosphaeridium heteracanthum ssp. heteracanthum
Autonym.
Originally Hystrichosphaeridium heteracanthum ssp. heteracanthum, subsequently Heterosphaeridium heteracanthum ssp. heteracanthum, thirdly (and now) Heterosphaeridium? heteracanthum sbsp. heteracanthum
Holotype: Deflandre and Cookson, 1955, pl.2, fig.5
Locus typicus: Victoria, Australia
Stratum typicum: ?Palaeocene-Lower Eocene
Original description: Deflandre and Cookson, 1955, p. 276: Hystrichosphaeridium heteracanthum
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, appendages 5-36 µm long (majority between 13 and 23 µm).
Emended diagnosis: Radmacher et al., 2013, p.33, 36: (based on original description and photograph of Deflandre and Cookson, 1955, pl. 2, figs. 5, 6): Large, gonyaulacacean, circular in outline, chorate to proximo-chorate cyst with an apical archaeopyle. Numerous, non-tabular processes are characterised by variable shape, length and width. All processes are solid, usually elongated and their endings differ significantly. They may be pointed, everted or irregularly branched, never “scythe-like” or distally connected. Wall structure is punctate.
Autonym.
Originally Hystrichosphaeridium heteracanthum ssp. heteracanthum, subsequently Heterosphaeridium heteracanthum ssp. heteracanthum, thirdly (and now) Heterosphaeridium? heteracanthum sbsp. heteracanthum
Holotype: Deflandre and Cookson, 1955, pl.2, fig.5
Locus typicus: Victoria, Australia
Stratum typicum: ?Palaeocene-Lower Eocene
Original description: Deflandre and Cookson, 1955, p. 276: Hystrichosphaeridium heteracanthum
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, appendages 5-36 µm long (majority between 13 and 23 µm).
Emended diagnosis: Radmacher et al., 2013, p.33, 36: (based on original description and photograph of Deflandre and Cookson, 1955, pl. 2, figs. 5, 6): Large, gonyaulacacean, circular in outline, chorate to proximo-chorate cyst with an apical archaeopyle. Numerous, non-tabular processes are characterised by variable shape, length and width. All processes are solid, usually elongated and their endings differ significantly. They may be pointed, everted or irregularly branched, never “scythe-like” or distally connected. Wall structure is punctate.