Nannotax3 - ntax_cenozoic - Helicosphaera HOL confusus type Nannotax3 - ntax_cenozoic - Helicosphaera HOL confusus type

Helicosphaera HOL confusus type


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

Taxonomy:

Citation: Helicosphaera HOL confusus type, informal
taxonomic rank: species
Synonyms:

Distinguishing features:
Parent taxon (Helicosphaera HOL): Monomorphic; liths solid - formed of layers of crystallites in rhomboid array
Coccolith distal surface with central boss and varying number of depressions.

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

Farinacci & Howe catalog pages: S. 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 Alboran 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:
LITHS: holococcolith, elliptical, CA: pores, process, closed,
CSPH: equant, monomorphic, CROSS-POLARS: 1ou, R-prominent,
Lith size: 2.1->3.1µm; Coccosphere size: 9->14µm; Liths per sphere: 35->80
Data source notes: 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:

References:

Cerino, F., Malinverno, E., Fornasaro, D., Kralj, M. & Cabrini, M. (2017). Coccolithophore diversity and dynamics at a coastal site in the Gulf of Trieste (northern Adriatic Sea). Estuarine Coastal and Shelf Science. 196: 331-345. gs

Cros, L. & Fortuño, J. -M. (2002). Atlas of northwestern Mediterranean coccolithophores. Scientia Marina. 66: 1-186. 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. In, Young, J. R., Thierstein, H. R. & Winter, A. (eds) Nannoplankton ecology and palaeocology, Proceedings of the INA7 conference, Puerto Rico, February 1998. 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

Winter, A., Reiss, Z. & Luz, B. (1979). Distribution of living coccolithophore assemblages in the Gulf of Elat ('Aqaba). Marine Micropaleontology. 4: 197-223. 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. S1: 1-132. gs


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Helicosphaera HOL confusus type compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-5-2024

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