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Cerebrocysta lagae
Cerebrocysta lagae, Louwye, 1999, p.117,119, pl.3, figs.8-11.
Holotype: Louwye, 1999, pl.3, figs.8-11.
Type locality: Mol (Antwerp province, Belgium), well no. 31W221 of the Geological Survey of Belgium, 60.5 m below core top.
Type stratum: Diest Formation, Upper Miocene.
Age: Late Miocene.
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Original description: [Louwye, 1999]:
Diagnosis:
Small, spherical proximate cyst with a smooth, thin autophragm ornamented with low, solid lamellae. In plan view, the lamellae are short and isolated or may connect for a short distance forming a fence-like pattern.
Archeopyle type 1P, operculum free.
Description:
The autophragm is relatively thin (less than 0.5 μm) and smooth. A discrete scabrate autophragm was observed on a few specimens only.
The height and width (0.5 to 0.8 μm) of the lamellae on an individual are constant. Their base is not enlarged and they arise perpendicular to the cyst wall on well preserved specimens. The distribution of the lamellae appears regular with no indication of a sulcus or a cingulum.
The precingular archeopyle is relatively large compared to the cyst diameter, the margins even or uneven and the angles well defined. The archeopyle is the only indication of a tabulation.
Dimensions:
Holotype: central body diameter, 26 μm; height of lamellae, 2.5 μm.
Range: central body diameter, 24(25.5)27 μm; height of lamellae, 1.5 to 3 μm. Number of specimens measured: 6.
Affinities:
Cerebrocysta bartonensis Bujak, 1980 differs in having a much denser and more regular distribution of low crests and by the occasional reflection of tabulation in the crest distribution. Cerebrocysta magna Bujak, 1994 is identical to Cerebrocysta bartonensis Bujak, 1980 except for its larger size. Cerebrocysta poulsenii De Verteuil and Norris, 1996 differs in having a less dense distribution of larger septa. Cerebrocysta? namocensis Head et al., 1989b is characterised by a network of low sinuous ridges forming an irregular fine reticular pattern. Cerebrocysta mediterranea Biffi and Manum, 1988 differs by the larger size (60–80 μm) and the presence of a well-defined reticulum. Occurrence: Upper Miocene (Diest Formation) of northern Belgium (this study).
Holotype: Louwye, 1999, pl.3, figs.8-11.
Type locality: Mol (Antwerp province, Belgium), well no. 31W221 of the Geological Survey of Belgium, 60.5 m below core top.
Type stratum: Diest Formation, Upper Miocene.
Age: Late Miocene.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Louwye, 1999]:
Diagnosis:
Small, spherical proximate cyst with a smooth, thin autophragm ornamented with low, solid lamellae. In plan view, the lamellae are short and isolated or may connect for a short distance forming a fence-like pattern.
Archeopyle type 1P, operculum free.
Description:
The autophragm is relatively thin (less than 0.5 μm) and smooth. A discrete scabrate autophragm was observed on a few specimens only.
The height and width (0.5 to 0.8 μm) of the lamellae on an individual are constant. Their base is not enlarged and they arise perpendicular to the cyst wall on well preserved specimens. The distribution of the lamellae appears regular with no indication of a sulcus or a cingulum.
The precingular archeopyle is relatively large compared to the cyst diameter, the margins even or uneven and the angles well defined. The archeopyle is the only indication of a tabulation.
Dimensions:
Holotype: central body diameter, 26 μm; height of lamellae, 2.5 μm.
Range: central body diameter, 24(25.5)27 μm; height of lamellae, 1.5 to 3 μm. Number of specimens measured: 6.
Affinities:
Cerebrocysta bartonensis Bujak, 1980 differs in having a much denser and more regular distribution of low crests and by the occasional reflection of tabulation in the crest distribution. Cerebrocysta magna Bujak, 1994 is identical to Cerebrocysta bartonensis Bujak, 1980 except for its larger size. Cerebrocysta poulsenii De Verteuil and Norris, 1996 differs in having a less dense distribution of larger septa. Cerebrocysta? namocensis Head et al., 1989b is characterised by a network of low sinuous ridges forming an irregular fine reticular pattern. Cerebrocysta mediterranea Biffi and Manum, 1988 differs by the larger size (60–80 μm) and the presence of a well-defined reticulum. Occurrence: Upper Miocene (Diest Formation) of northern Belgium (this study).