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Cyclonephelium densebarbatum
Cyclonephelium densebarbartum Cookson and Eisenack, 1960
NOW Circulodinium. Originally Cyclonephelium, subsequently (and now) Circulodinium.
Holotype: Cookson and Eisenack, 1960b, pl.38, fig.10; Fauconnier and Masure, 2004, pl.14, figs.3–4.
Locus typicus: W Australia
Stratum typicum: Tithonian
Original description: Cookson and Eisenack, 1960, p.253
Shell flat, circular to slightly polyedral with a broad (c.16-24 µm) peripheral zone, ornamented on both sides with short, densely arranged, rod-shaped bristles, ranging from c.2-12 µm in length, with simple, usually capitate or sometimes bifurcate ends, and inner areas without bristles but with granular surfaces. A transverse "girdle" is sometimes evident; a large, terminal pylome results from the complete detachment of the apical region.
Dimensions: holotype - shell 95 µm long, 92 µm broad, overall 100x98 µm,. Range - overall diameter 86-114 µm.
Affinities:
Cookson and Eisenack, 1960, p.253: C. densebarbatum differs from C. distinctum Defl. and Cookson, the species of Cyclonephelium to which it is most closely similar, in the stouter nature of the shell and the much denser arrangement of the bristles. The examples from the Wallal deposits on the whole have longer bristles, especially at the antapical region, than those from Broome and Roebuck Bay deposits.
NOW Circulodinium. Originally Cyclonephelium, subsequently (and now) Circulodinium.
Holotype: Cookson and Eisenack, 1960b, pl.38, fig.10; Fauconnier and Masure, 2004, pl.14, figs.3–4.
Locus typicus: W Australia
Stratum typicum: Tithonian
Original description: Cookson and Eisenack, 1960, p.253
Shell flat, circular to slightly polyedral with a broad (c.16-24 µm) peripheral zone, ornamented on both sides with short, densely arranged, rod-shaped bristles, ranging from c.2-12 µm in length, with simple, usually capitate or sometimes bifurcate ends, and inner areas without bristles but with granular surfaces. A transverse "girdle" is sometimes evident; a large, terminal pylome results from the complete detachment of the apical region.
Dimensions: holotype - shell 95 µm long, 92 µm broad, overall 100x98 µm,. Range - overall diameter 86-114 µm.
Affinities:
Cookson and Eisenack, 1960, p.253: C. densebarbatum differs from C. distinctum Defl. and Cookson, the species of Cyclonephelium to which it is most closely similar, in the stouter nature of the shell and the much denser arrangement of the bristles. The examples from the Wallal deposits on the whole have longer bristles, especially at the antapical region, than those from Broome and Roebuck Bay deposits.