Taxonomy:
Distinguishing features:
Parent taxon (Polycrater phase): Phase with quadrate, cup-like nannoliths
This taxon: Distal cup incomplete, two petals normal, the other two reduced to a rod-like structure
Farinacci & Howe catalog pages:
Morphology:
"The coccosphere has an unusual spiny shape. The coccoliths have the sepal-like structure similar to the other Polycrater species, whilst the petal-like structure is highly modified: two petal-like elements are very reduced with the corner highly extended forming a tall rod; the other two petal-like elements are normally constructed, the entire structure thus resembling a ladle." [Cros & Fortuno 2002]
Size:
LITHS: nannolith-radiate, quadrate, CA: ca_conjunct, pores, closed, CSPH: equant, monomorphic, CROSS-POLARS: V-prominent, |
Lith size: 0.3->0.7µm; Segments: 4->4; Coccosphere size: 5->10µm; Data source notes: csph & lith length from Cros & Fortuño 2002 (extended by inclusion of variants) |
Geological Range:
Last occurrence (top): Extant. Data source: present in the plankton (Young et al. 2003)
First occurrence (base): within No known fossil record modern (0-0Ma, base in "Holocene" stage). Data source: [JRY rough estimate]
Plot of occurrence data:
Cros, L. & Fortuño, J. -M. (2002). Atlas of northwestern Mediterranean coccolithophores. Scientia Marina. 66: 1-186. gs Young, J. R., Geisen, M., Cros, L., Kleijne, A., Probert, I. & Ostergaard, J. B. (2003). A guide to extant coccolithophore taxonomy. Journal of Nannoplankton Research. S1: 1-132. gs References:
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Polycrater sp. ladle-like compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 10-12-2023
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1062 Go to Archive.is to create a permanent copy of this page - citation notes |
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