Placorhombus ziveriae

Classification: ntax_cenozoic -> Coccolith families inc sed -> narrow rimmed placoliths -> Placorhombus -> Placorhombus ziveriae
Sister taxa: P. ziveriae, P. sp. cf. ziveriae, P. sp.


Citation: Placorhombus ziveriae Young & Geisen, in Young et al., 2003
Rank: Species

Distinguishing features: striae on all four plates sub-parallel to coccolith width

Farinacci & Howe catalog pages: P. ziveriae *

Coccosphere, elongate, monomorphic.
Coccoliths diamond-shaped (all four edges of similar length); rim narrow with two flanges; central area filled by four plates ornamented with striae on the distal side.

Size: Coccospheres 35-55 µm long and ca. 4 µm wide, with 100-200 coccoliths. Coccolith length 1.8-2.4 µm.

Ecology & Biogeography: Mid photic, recorded form W. Meditwrranean and Caribbean

Search data:
TagsLITHS: placolith, quadrate, CA: ca_disjunct, plate, closed,
CSPH: tubular, monomorphic, CROSS-POLARS: rim-unicyclic,
MetricsLith size: 1.8->2.4µm; Coccosphere size: 35->55µm; Liths per sphere: 100->200
Data source notes: csph & lith size from OD
The morphological data given here can be used on the advanced search page. See also these notes

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 (0.00-0.00Ma, base in "Holocene" stage). Data source: [JRY rough estimate]

Plot of occurrence data:


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, Special Issue. 1: 1-132. gs V O


Placorhombus ziveriae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 1-3-2021

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Short stable page link: Go to to create a permanent copy of this page - citation notes

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