Helicosphaera HOL confusus type


Classification: Coccolithophores -> Holococcoliths -> flat-topped -> Helicosphaera HOL -> Helicosphaera HOL confusus type
Sister taxa: H. HOL catilliferus type, H. HOL confusus type, H. HOL dalmaticus type, H. HOL ponticuliferus type,

Taxonomy:

Citation: Helicosphaera HOL confusus type, informal
Rank: Form
Synonyms:

Distinguishing features: Liths with 7-10 depressions; pyramidal boss near centre; distinctly thicker than catilliferus

Farinacci & Howe catalog pages: Syracolithus confusus *


Size: Liths 2-3 µm long; 8-11 crystallites high

Biology & life-cycles: Combination coccospheres with Helicosphaera HOL catilliferus type have been observed by L. Cros in the Alboraon Sea (Cros et al. 2000, Geisen et al. 2002). These may have arisen due to malformation or hybridization but suggest that the two forms are very closely related.

See also: Helicosphaera carteri ;

Search data:
TagsLITHS: holococcolith, H: disk-like, elliptical, RIM: H: base flangeless, H: tube (Holos), CA: H: distal-cover, H: distal-cover-flat, H: fabric-rhomboid, pores, process, closed,
CSPH: spherical, equant, monomorphic, V-UNITS: none, R-UNITS: all, R-prominent, DETAILS: 1ou,
MetricsLith size: 2.1->3.1µm; Coccosphere size: 9->14µm; Liths per sphere: 35->80
Sources: morphom data from Yang & Wei (2003), Cros & Fortuño (2002) & Kleijne 1991
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 Quaternary Period (0.00-2.59Ma, base in Gelasian stage). Data source: [JRY rough estimate]

Plot of occurrence data:

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

    References:

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

    Cros, L., Kleijne, A., Zeltner, A., Billard, C. & Young, J. R. (2000b). New examples of holococcolith-heterococcolith combination coccospheres and their implications for coccolithophorid biology. Marine Micropaleontology. 39(1-4): 1-34. gs

    Geisen, M., Billard, C., Broerse, A. T. C., Cros, L., Probert, I. & Young, J. R. (2002a). Life-cycle associations involving pairs of holococcolithophorid species: intraspecific variation or cryptic speciation?. European Journal of Phycology. 37: 531-550. gs

    Kleijne, A. (1991). Holococcolithophorids from the Indian Ocean, Red Sea, Mediterranean Sea and North Atlantic Ocean. Marine Micropaleontology. 17: 1-76. gs

    Young, J. R. & Bown, P. R. (2014). Some emendments to calcareous nannoplankton taxonomy. Journal of Nannoplankton Research. 33(1): 39-46. 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


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

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=664 Go to Archive.is to create a permanent copy of this page - citation notes



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