Helicosphaera pavimentum


Classification: Coccolithophores -> Zygodiscales -> Helicosphaeraceae -> Helicosphaera -> H. carteri group -> Helicosphaera pavimentum
Sister taxa: H. pavimentum, H. hyalina, H. carteri, H. wallichii, H. princei, H. inversa, H. sellii, H. ethologa, H. huangii, H. mediterranea, H. intermedia, H. rhomba, H. euphratis, H. leesiae, H. truempyi,

Taxonomy:

Citation: Helicosphaera pavimentum Okada & McIntyre, 1977
Rank: Species
Notes & discussion: A distinctive extant species but rarerly recorded from fossil record

Distinguishing features: Small to medium sized. Flange narrow without distinct wing. Central-area with two small in-line pores.

Farinacci & Howe catalog pages: Helicosphaera pavimentum *


Morphology remarks: Blanket elements confined to central area and a weak ridge often surrounds them. Having the blanket confined to the central area is similar to the structure H. stalis and so possibly this will prove to be a deeply diverged species from the rest of the living Helicosphaera species.
In LM coccospheres are not much smaller than H. hyalina but have more coccoliths and are more or less equant, rather than elongated/ellipsoidal, also the liths are thinner.

Biology & life-cycles: A likely combination coccolith with Syracolithus dalmaticus was illustrated by Triantaphyllou et al. (2016).

See also: Helicosphaera HOL dalmaticus type ;

Search data:
TagsLITHS: placolith, asymmetric, elliptical, RIM: spine(s), wing, CA: bar,
CSPH: ellipsoidal-----, equant, elongated, monomorphic, varimorphic, V-UNITS: distal shield, V-prominent, R-UNITS: blanket, c-str, px-plate, R-prominent, DETAILS: rim-bicyclic, isogyres kinked, isogyres oblique, isogyres separated,
MetricsLith size: 4->6µm; Coccosphere size: 9->15µm; Liths per sphere: 15->50
Sources: lith numbers from Yang & Wei 2003, range of estimates
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: A distinctive extant species but rarely recorded from fossil record.
Last occurrence (top): Extant Data source: present in the plankton (Young et al. 2003)
First occurrence (base): within NN19 zone (0.44-1.93Ma, base in Gelasian stage). Data source: Young 1998

Plot of occurrence data:

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

    References:

    Cros, L. & Fortuño, J. -M. (2002). Atlas of northwestern Mediterranean coccolithophores. Scientia Marina. 66: 186-. gs

    Okada, H. & McIntyre, A. (1977). Modern coccolithophores of the Pacific and North Atlantic Oceans. Micropaleontology. 23(1): 1-55. gs

    Triantaphyllou, M. et al. (2016). Coccolithophore combination coccospheres from the NE Mediterranean Sea: new evidence and taxonomic revisions. Micropaleontology. 61(6): 457-472. gs

    Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 225-265. 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, Special Issue. 1: 1-132. gs


    nannotaxlogo400px

    Helicosphaera pavimentum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-4-2020

    Taxon Search:
    Advanced Search

    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=678 Go to Archive.is to create a permanent copy of this page - citation notes



    Comments (0)

    No comments yet on this page. Please do add comments if you spot any problems, or have information to share

    Add Comment

    * Required information
    1000
    Captcha Image
    Powered by Commentics