Cyclagelosphaera brezae
Set number: 1739
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10µm
Set number: 1740
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10µm
Set number: 1738
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10µm
Set number: 1741
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10µm
Cyclagelosphaera brezae Applegate & Bergen, 1988
Large (>8.0 μm) species of Cyclagelosphaera exhibit a closed central area and a very narrow proximal shield. Cyclagelosphaera brezae differs from Cyclagelosphaera paucisegmenta by having a larger number of segments (about 30) and a very narrow proximal shield, approximately 1/3 of the distal shield. In contrast, Cyclagelosphaera paucisegmenta has about 20 segments, and the size differences of its shields are negligible.
Applegate, J. L. & Bergen, J. A. 1988. Cretaceous calcareous nannofossil biostratigraphy of sediments recovered from the Galicia Margin, ODP Leg 103. Proceedings of the Ocean Drilling Program, Scientific Results. 103: 293-348.
Holotype
Cyclagelosphaera brezae
Applegate & Bergen, 1988
Valanginian
ODP Leg 103, Site 638B, Galicia margin, North Atlantic