Nannotax3 - ntax_main - Calciosolenia murrayi

Citation: Calciosolenia murrayi Gran, 1912

Synonyms:

Acanthosolenia mediterranea Bernard 1939;
Calciosolenia sinuosa Schlauder 1945 [according to Okada & McIntyre 1977]
Calciosolenia compacta Martini (1981) [described from the Quaternary but falls well inside range of variation of modern C. murrayi - JRY]

Variants: Malinverno 2004 recognised four types within C. murrayi based primarily on the sepration of the laths in the central area of the body coccoliths

Type 1: laths well-separated; marked spurs at the ends of the liths; 2.5-3.1µm
Type 2: laths weakly-separated; 2.6-3.1µm
Type 3: laths overlapping; 2.6-2.7µm
Type 4: laths tile-like, strongly overlapping; 3.4-3.8µm long

She interpreted this variation as most likely being a case of variable degree of calcification, since the types intergraded and coccospheres with more than coccolith type can occur.

Distinguishing features:
Parent taxon (Calciosolenia): Coccosphere with rhombic muroliths with central area floored by transverse laths (scapholiths); varimorphic or dimorphic. Rim bicyclic in LM (the outer part of the rim is dark in xpl, the inner part bright). Typically small, fragile and dissolution susceptible, and so only consistently seen as fossils when preservation is good.
This taxon: Dimorphic - terminal coccoliths have one end extended into spine; coccoliths 2.5-4 µm long, often with overlapping laths

Coccosphere dimorphic, broad, tapering rather abruptly at ends with only a few elongate liths. Terminal liths have one end extended into spine. Bars not very regular and often merge into continuous sheet. Liths 2.5-4 µm long, spines up to 25 µm, coccospheres up to 30 µm.
For identification note that the liths usually are smaller than an E. huxleyi coccolith and/or have overlapping laths.

Liths 2.5-4 µm long, spines up to 25 µm, coccospheres up to 30 µm.

Geological Range:
Notes: Frequently recorded in the fossil record, but mainly as a default identification.
Last occurrence (top): Extant. Data source: present in the plankton (Young et al. 2003)
First occurrence (base): within Paleocene Epoch (55.96-66.04Ma, base in Danian stage). Data source: [JRY rough estimate]

References:

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

Bernard, F. (1939). Coccolithophorides nouveaux ou peu connus observes à Monaco en 1938. Archives de Zoologie Expérimentale et Générale, Paris. 81: 33-44. gs

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

Gran, H. H. (1912). Pelagic plant life. In, Murray, J. & Hjort, J. (eds) The Depths of the Ocean. Macmillan, London 307-386. gs

Malinverno, E. (2004). Morphological variability within the genus Calciosolenia (coccolithophorids) from the eastern Mediterranean Sea. Micropaleontology. 50(supl. 1): 81-91. gs

Malinverno, E., Leoni , B. & Galli, P. (2022). Coccolithophore assemblages and a new species of Alisphaera from the Faafu Atoll, Maldives, Indian Ocean. Marine Micropaleontology. 172(102110): 1-16. gs

Manton, I. & Oates, K. (1985). Calciosoleniaceae (coccolithophorids) from the Galapagos Island: unmineralized components and coccolith morphology in Anoplosolenia and Calciosolenia, with comparative analysis of equivalents in the unmineralized genus Navisolenia (Haptophyceae = Prymnesiophyceae). Philosophical Transactions of the Royal Society of London. 309: 461-477. gs

Schlauder, J. (1945). Recherches sur les flagellés calcaires de la Baie d'Alger. PhD thesis, Université d'Alger. 1-51. gs

Yang, T. -N., Wei, K. & Wu, J. -T. (2012). Marine coccolithophores around Taiwan. Biodiversity Research Center, Academica Sinica, Taipei. 1-96. 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

Calciosolenia murrayi

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