Farinacci & Howe catalog pages: C. muzylevii *
Morphology: Large heterococcoliths, with elongated, sinuous, biconvex shape in plan-view, with spinose walls and an H-shaped septum in the center.
Description: The external wall is rather thick, composed of large, clearly visible elements of medium height, slightly widening from the base towards the distal part. Along one side of the coccolith 6–9 relatively large pointed spines occur. There are generally some minor tubercles on the opposite side of the coccolith. The coccolith has pointed ends, one of which bears a large beak-shaped spine; on the opposite end the spine is generally ill-defined or missing. The central part is partitioned by a large, thick, H-shaped septum, somewhat skewed relative to the coccolith axes. The septum ends reach the wall, bifurcate and extend beyond the contour as relatively large spines on one side of the coccolith. The septum projects rather high above the wall. Under XPL, the entire coccolith structure produces a moderately bright birefringence, the Н-shaped central structure showing brighter lumines- cence than the wall.
Differentiation: The new species differs from Ch. armatus in having a higher wall, larger size, clearly defined elongated S-shape with pointed ends, and larger spines arranged only on one side of the coccolith. It differs from Ch. vandenberghei in the elongated S-shape, presence of smaller spines on only one wall, absence of large ribs, the Н-shaped structure, and the framing walls are lower. It differs from Ch. acanthodes in the larger size, oval S-shaped coccolith and Н-shaped septum. [Musatov 2017]
Size: L = 10.0–14.0μm; W = 6.0–9.0μm. Holotype size: L = 14.0μm; W = 9.0μm [Muzatov 2017]
|Tags||LITHS: murolith, asymmetric, elliptical, CA: diagonal cross, CROSS-POLARS: rim-unicyclic, V-prominent,|
|Metrics||Lith size: 10->14µm; |
Data source notes: lith size from OD
Last occurrence (top): within NP13 zone (49.11-50.50Ma, top in Ypresian stage). Data source: Musatov 2017
First occurrence (base): within NP12 zone (50.50-53.70Ma, base in Ypresian stage). Data source: Musatov 2017
Plot of occurrence data:
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