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Systematophora variabilis
Systematophora? variabilis (Cookson and Eisenack, 1967) Stover and Evitt, 1978
Originally Cyclonephelium, subsequently (and now) Systematophora?. Stover and Evitt, 1978 considered this to be a "provisionally accepted species" of Systematophora.
Holotype: Cookson and Eisenack, 1967a, pl.19, fig.9; Fauconnier and Masure, 2004, pl.77, figs.6–8.
Paratype: Cookson and Eisenack, 1967
Locus typicus: Strahan, Tasmania
Stratum typicum: Paleocene
Original description: Cookson and Eisenack, 1967, p.134: Cyclonephelium variabile
Open shell roughly spherical in outline, with or without a short, blunt antapical prominence towards one side and a variable number of simple or branched appendages which vary considerably in both length and width, and may be either free or united with neighbouring ones. The appendages are most numerous near the margins of the shell, and almost entirely absent from a narrow central area on one side of the shell. The shell opens by the detachment of the apical portion along an almost straight line.
Dimensions: Holotype--overall diameter c. 109 µm, shell c. 75 µm, appendages c. 20-34 µm long. Range--overall diameter c. 85-120 µm, shell c. 60-90 µm, appendages 10-38 µm long.
Affinities:
Cookson and Eisenack, 1967, p.135: Cyclonephelium variabile
C. variabile, as the specific name suggests, is extremely variable, and the limits and even generic placing of some of the examples are difficult to assess. C. variabile is clearly distinct from C. retintextum Cookson 1965 from certain Victorian Upper Cretaceous (probably Senonian) deposits and particularly the Paleocene Pebble Point Formation, in which both surfaces have clearly defined unornamented areas and all the appendages are looped.
Originally Cyclonephelium, subsequently (and now) Systematophora?. Stover and Evitt, 1978 considered this to be a "provisionally accepted species" of Systematophora.
Holotype: Cookson and Eisenack, 1967a, pl.19, fig.9; Fauconnier and Masure, 2004, pl.77, figs.6–8.
Paratype: Cookson and Eisenack, 1967
Locus typicus: Strahan, Tasmania
Stratum typicum: Paleocene
Original description: Cookson and Eisenack, 1967, p.134: Cyclonephelium variabile
Open shell roughly spherical in outline, with or without a short, blunt antapical prominence towards one side and a variable number of simple or branched appendages which vary considerably in both length and width, and may be either free or united with neighbouring ones. The appendages are most numerous near the margins of the shell, and almost entirely absent from a narrow central area on one side of the shell. The shell opens by the detachment of the apical portion along an almost straight line.
Dimensions: Holotype--overall diameter c. 109 µm, shell c. 75 µm, appendages c. 20-34 µm long. Range--overall diameter c. 85-120 µm, shell c. 60-90 µm, appendages 10-38 µm long.
Affinities:
Cookson and Eisenack, 1967, p.135: Cyclonephelium variabile
C. variabile, as the specific name suggests, is extremely variable, and the limits and even generic placing of some of the examples are difficult to assess. C. variabile is clearly distinct from C. retintextum Cookson 1965 from certain Victorian Upper Cretaceous (probably Senonian) deposits and particularly the Paleocene Pebble Point Formation, in which both surfaces have clearly defined unornamented areas and all the appendages are looped.