Taxonomy:
Distinguishing features: Like H. arethusae but bridge has three struts (Y-shaped in plan view) and supports spine.
Farinacci & Howe catalog pages: H. triarcha *
Size: Liths ca. 2.5 µm long, 2-3 µm high
Tags | LITHS: holococcolith, elliptical, hollow, CA: plate, process, bar, CSPH: equant, monomorphic, CROSS-POLARS: R-prominent, |
Metrics | Lith size: 1.7->3µm; Coccosphere size: 10->13µm; Liths per sphere: 70->130 Data source notes: morphom data from Yang & Wei (2003), Cros & Fortuño (2002) |
Geological Range:
Last occurrence (top): Extant Data source: present in the plankton (Young et al. 2003)
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in "Holocene" stage). Data source: [JRY rough estimate]
Plot of occurrence data:
Andruleit, H., Rogalla, U. & Staeger, S. (2005). Living coccolithophores recorded during the onset of upwelling conditions off Oman in the western Arabian Sea. Journal of Nannoplankton Research. 27(1): 1-14. gs V O Cros, L. & Fortuño, J. -M. (2002). Atlas of northwestern Mediterranean coccolithophores. Scientia Marina. 66: 1-186. gs V O Halldal, P. & Markali, J. (1955). Electron microscope studies on coccolithophorids from the Norwegian Sea, the Gulf Stream and the Mediterranean. Avhandlinger utgitt av det Norske Videnskapsakademi i Oslo. Matematisk-Naturvidenskapelig Klasse. 1955(1): 1-30. gs Kleijne, A. (1991). Holococcolithophorids from the Indian Ocean, Red Sea, Mediterranean Sea and North Atlantic Ocean. Marine Micropaleontology. 17: 1-76. gs Okada, H. & McIntyre, A. (1977). Modern coccolithophores of the Pacific and North Atlantic Oceans. Micropaleontology. 23(1): 1-55. gs Yang, T-N., Wei, K-Y. & Gong G-C. (2001). Distribution of coccolithophorids and coccoliths in surface ocean off northeastern Taiwan. Botanical Bulletin of the Academia Sinica. 42: 287-302. 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 OReferences:
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Homozygosphaera triarcha compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 13-4-2021
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