Nannotax3 - ntax_cenozoic - Calcidiscus leptoporus subsp. leptoporus HOL

Citation: Calcidiscus leptoporus subsp. leptoporus (Murray & Blackman 1898) Loeblich & Tappan, 1978 HOL

Basionym: Coccosphaera leptopora Murray and Blackman 1898

Synonyms: Crystallolithus rigidus Gaarder in Heimdal & Gaarder 1980

Distinguishing features: Disk with double layer of crystallites in hexagonal meshwork array

Morphology: Liths with double layer of crystallites in hexagonal meshwork array, upper layer often incomplete; rim 3 crystallites high.

Biology & life-cycles: Life-cycle combination coccospheres with Calcidiscus leptoporus illustrated by Kleijne (1991), Cortes (2000), Renaud & Klaas (2001) and transition seen in culture (Geisen et al. 2002, Houdan et al. 2004).

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]

References:

Cortés, M. Y. (2000). Further evidence for the heterococcolith-holococcolith combination Calcidiscus leptoporus-Crystallolithus rigidus. In, Young, J. R., Thierstein, H. R. & Winter, A. (eds) Nannoplankton ecology and palaeocology, Proceedings of the INA7 conference, Puerto Rico, February 2004. Marine Micropaleontology. 39(1-4): 35-37. gs

Cros, L. & Fortuño, J. -M. (2002). Atlas of northwestern Mediterranean coccolithophores. Scientia Marina. 66: 1-186. gs V O

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 V O

Heimdal, B. R. & Gaarder, K. R. (1980). Coccolithophorids from the northern part of the eastern central Atlantic I. Holococcolithophorids. “Meteor” Forschungsergebnisse, Reihe D, Biologie. 32: 1-14. gs

Houdan, A. et al. (2004a). Flow cytometric analysis of relative ploidy levels in holococcolithophore-heterococcolithophore (Haptophyta) life cycles. Systematics and Biodiversity. 1(4): 453-465. gs

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

Murray, G. & Blackman, V. H. (1898). On the nature of the Coccospheres and Rhabdospheres. Philosophical Transactions of the Royal Society of London B: Biological Sciences. 190(1): 427-441. gs V O

Renaud, S. & Klaas, C. (2001). Seasonal variations in the morphology of the coccolithophore Calcidiscus leptoporus off Bermuda (N. Atlantic). Journal of Plankton Research. 23(8): 779-795. 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 V O

Tags	LITHS: holococcolith, elliptical, CA: closed, CSPH: equant, monomorphic, CROSS-POLARS: 1ou, V-prominent, R-prominent,
Metrics	Lith size: 1.6->2.4µm; Coccosphere size: 8->15µm; Liths per sphere: 50->200 Data source notes: morphom data from Yang & Wei (2003), Cros & Fortuño (2002) & Kleijne 1991

Calcidiscus leptoporus subsp. leptoporus HOL

References:

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