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Cerebrocysta magna
Cerebrocysta magna, Bujak, 1994, p.121, pl.2, figs.10–11.
Holotype: Bujak, 1994, pl.2, fig.10.
Locus typicus: North Sea, UEC21 /28a-5 well
Stratum typicum: Middle Eocene
Age: Ypresian–Lutetian.
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Original description: [Bujak, 1994, p. 121]:
Diagnosis:
Autocyst spherical to ovoidal, without apical, antapical or other projections, except for an apparently random ornament of low crests which give the cyst a cerebral appearance. The crests occasionally suggest a paratabular arrangement. Cyst diameter always exceeding 40 µm.
Archeopyle formed by the loss of precingular paraplate 3".
Dimensions:
Cyst length 49-59 µm, breadth 46-63 µm.
Affinities:
The genus Cerebrocysta was erected by Bujak (1980) for specimens present in the Barton Beds of the Hampshire Basin, with the type species, C. bartonensis Bujak, having a cyst diameter ranging from 241 µm to 28 µm (plate 2, fig 9). C. bartonensis is persistently present in fairly low numbers in the North Sea where it has its highest occurrence in Bartonian Subzone E7a of Bujak and Mudge. C. magna is identical to C. bartonensis in all respects except for its larger size, and there is no indication that the two species intergrade. C. magna has a more restricted stratigraphic range in the North Sea, having its highest occurrence at the top of Lutetian Subzone E4c of Bujak and Mudge.
Holotype: Bujak, 1994, pl.2, fig.10.
Locus typicus: North Sea, UEC21 /28a-5 well
Stratum typicum: Middle Eocene
Age: Ypresian–Lutetian.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Bujak, 1994, p. 121]:
Diagnosis:
Autocyst spherical to ovoidal, without apical, antapical or other projections, except for an apparently random ornament of low crests which give the cyst a cerebral appearance. The crests occasionally suggest a paratabular arrangement. Cyst diameter always exceeding 40 µm.
Archeopyle formed by the loss of precingular paraplate 3".
Dimensions:
Cyst length 49-59 µm, breadth 46-63 µm.
Affinities:
The genus Cerebrocysta was erected by Bujak (1980) for specimens present in the Barton Beds of the Hampshire Basin, with the type species, C. bartonensis Bujak, having a cyst diameter ranging from 241 µm to 28 µm (plate 2, fig 9). C. bartonensis is persistently present in fairly low numbers in the North Sea where it has its highest occurrence in Bartonian Subzone E7a of Bujak and Mudge. C. magna is identical to C. bartonensis in all respects except for its larger size, and there is no indication that the two species intergrade. C. magna has a more restricted stratigraphic range in the North Sea, having its highest occurrence at the top of Lutetian Subzone E4c of Bujak and Mudge.