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Cannosphaeropsis filamentosa
Cannosphaeropsis filamentosa, Cookson and Eisenack, 1958
Now Rigaudella. Originally Cannosphaeropsis, subsequently Adnatosphaeridium, thirdly (and now) Rigaudella.
Tax. sr. synonym of Cannosphaeropsis perforata Alberti, 1961, according to Stancliffe and Sarjeant, 1990.
Holotype: Cookson and Eisenack, 1958, pl.7, fig.9
Locus typicus: Carnavron Basin, W Australia
Stratum typicum: Middle-Late Jurassic
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Original description: [Cookson and Eisenack, 1958, p. 47]:
Description:
Shell approximately sphaerical, provided with a varying number of thin, solid processes which branch distally, sometimes in a fan-shaped manner, to form by their coalescence an open or sometimes dense enveloping network.
Dimensions:
Holotype - overall diameter 124 µm, shell 48 µm.
Affinities:
C. filamentosa is distinct from C. aemula in that the processes supporting the enveloping network are more uniform in size and never possess the hollow extremities of that species.
Now Rigaudella. Originally Cannosphaeropsis, subsequently Adnatosphaeridium, thirdly (and now) Rigaudella.
Tax. sr. synonym of Cannosphaeropsis perforata Alberti, 1961, according to Stancliffe and Sarjeant, 1990.
Holotype: Cookson and Eisenack, 1958, pl.7, fig.9
Locus typicus: Carnavron Basin, W Australia
Stratum typicum: Middle-Late Jurassic
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Cookson and Eisenack, 1958, p. 47]:
Description:
Shell approximately sphaerical, provided with a varying number of thin, solid processes which branch distally, sometimes in a fan-shaped manner, to form by their coalescence an open or sometimes dense enveloping network.
Dimensions:
Holotype - overall diameter 124 µm, shell 48 µm.
Affinities:
C. filamentosa is distinct from C. aemula in that the processes supporting the enveloping network are more uniform in size and never possess the hollow extremities of that species.