Vexillarius acerviphora

Classification: Coccolithophores -> Coccolith families inc sed -> Papposphaeraceae -> Vexillarius -> Vexillarius acerviphora
Sister taxa: V. acerviphora, V. cancellifer, V. cereus, V. iaculifer, V. sp.,


Citation: Vexillarius acerviphora (Thomsen & Ostergaard 2015) Andruleit & Jordan 2017
Rank: Species
Basionym: Porsildia acerviphora Thomsen & Ostergaard 2015
Notes & discussion: Recombined into Vexliarius by  Andruleit & Jordan (2017) on grounds of having simlar body coccoliths and equatorial coccoliths with spine. This interprettion is reasonable but it may be noted that the axial plate in acervophora is not seen in the other Vexilarius species and it is not clear if the spine is hollow and has a square section.

Distinguishing features: Process narrow, weakly tapering; c-area with axial plate.

Farinacci & Howe catalog pages: Porsildia acerviphora *

Morphology remarks: Coccosphere dimorphic. Circum flagellar coccoliths have a central process formed proxi- mally by numerous densely aggregated elements and distally terminating in two closely aligned elongate elements. Body coccoliths oval. In both coccolith types the vertical wall consists of slightly overlapping elements that vary in size and shape. The central area of the body coccoliths has a low central structure of irregularly piled elements that vary in size and shape; this structure is not connected to the rim. [from Thomsen & Ostergaad 2015 - generic diagnois of Porsildia]

Up to 10 circum-flagellar pole coccoliths. The central process measures 1.7–1.9 μm in length and 0.2–0.3 μm in width. The length of the distal twin pair of elongate elements is 0.5–0.7 μm. Body coccoliths oval (1.0–1.2 × 0.6–0.7 μm) with an irregular outline and a central heap of calcified elements. The rim has an irregular upper margin and it is asymmetrical; one end bears a distinctly larger, widening and pointed, element of variable shape. The height of the rim is variable within the range 0.2–0.4 μm. [from Thomsen & Ostergaad 2015 - diagnosis of P. acerviphora]

Ecology & Biogeography: Arctic species

Search data:
TagsLITHS: murolith, elliptical, RIM: outer wall non-imbricate, rim-narrow, CA: axial ridge or plate, process,
CSPH: spherical, equant, CFC, CFC+process, polymorphic, DETAILS: ca_disjunct,
MetricsLith size: 0.7->1.2µm; Coccosphere size: 6->7µm;
Sources: csph & lith size (BC diameter) 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
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in stage). Data source: [JRY 2016]

Plot of occurrence data:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Vexillarius


    Andruleit, H. & Jordan, R. W. (2017). Two new species of Vexillarius (Prymnesiophyceae) from the eastern Indian Ocean. Phycologia. 56(5): 510-516. gs :: ::

    Thomsen, H. A. & Ostergaard, J. B. (2015). Coccolithophorids in Polar Waters: Mercedesia gen. nov., Ericiolus, Quaternariella and Porsildia gen. nov. Acta Protozoologica. 54: 155-169. gs :: ::


    Vexillarius acerviphora compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 10-7-2020

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

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