Calciosolenia corsellii Coccosphere without spines; coccoliths 3-4µm long, with spurs at the ends
Calciosolenia murrayi Dimorphic - terminal coccoliths have one end extended into spine; coccoliths 2.5-4 µm long, often with overlapping laths
fossil species
Calciosolenia alternans Small Calciosolenia with a relatively broad central-area filled by a plate-like structure that displays a four-fold, alternating light-dark birefringence image.
Calciosolenia aperta Broad, rhomboidal scapholith with broad flaring rim and central area spanned by transverse bars and thick, distal longitudinal bar.
Calciosolenia sp. Calciosolenia specimens which cannot be assigned to established species
NB The monomorphic species C. brasiliensis has often been placed in a separate genus, Anoplosolenia, leaving the dimorphic species C. murrayi in Calciosolenia. Following Young et al. (2003) we prefer to include both species in a single genus, since the coccolith structure of the two species is identical and their affinity is not in dispute. Including the two species in one genus makes this affinity clearer, reduces the number of monospecific genera, and avoids the problem of having generic concepts which cannot be applied to isolated coccoliths in the fossil record. As a result, the artificial genus Scapholithus, which has often been used by palaeontologists for isolated scapholiths, is redundant, all such specimens can be included in Calciosolenia.
Since fossil specimens cannot usually be confidently assigned to either C. murrayi or C. brasiliensis the best identification is usually Calciosolenia sp.
Distinguishing features: Parent taxon (Calciosoleniaceae): Narrow-rimmed muroliths with central-lath structures but no axial structure. Often strongly varimorphic This taxon: Coccosphere with rhombic muroliths with central area floored by transverse laths (scapholiths); varimorphic or dimorphic.
Morphology: Coccolith structure and optics discussed in Bown et al. 2017 Size: Coccolith size typically small (2-5 µm) exceptionally up to 7 µm. Some size variation depending on position on coccosphere but within species the size of the main body coccoliths seems to be a useful taxonomic criterion (see Malinverno 2004).
See also:Calciosolenia - also occurs in the Mesozoic;
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: Total of ranges of the species in this database First occurrence (base): within Paleocene Epoch (55.96-66.04Ma, base in Danian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Bernard, F. (1939). Coccolithophorides nouveaux ou peu connus observes à Monaco en 1938. Archives de Zoologie Expérimentale et Générale, Paris. 81: 33-44. gs
Bown, P. R., Lees, J. A. & Young, J. R. (2017). On the Cretaceous origin of the Order Syracosphaerales and the genus Syracosphaera. Journal of Micropalaeontology. 36(2): 153-165. gs
Deflandre, G. & Fert, C. (1954). Observations sur les coccolithophoridés actuels et fossiles en microscopie ordinaire et électronique. Annales de Paléontologie. 40: 115-176. gs
Deflandre, G. (1952). Classe des Coccolithophoridés. (Coccolithophoridae. Lohmann, 1902). In, Grassé, P. P. (ed.) Traité de Zoologie. Masson, Paris 439-470. 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
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 compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-9-2024
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Rui da Gama
10
Jun 2017
Rui da Gama(Malaysia)
There seems to be an issue with the Calciosolenia page in nannotax. It appears there are two alternative pages for this genus. In one, it looks like C. fossilis, C. huberi, C. sp. are not included as taxa (see page herein). In the other, the former taxa are included but C. alternans, C. aperta, C. brasiliensis, C. corsellii, C. murrayi, C. sp. are not represented.
Jeremy Young
530
Jan 2017
Jeremy Young(UK)
Hi Rui
Yes, that is because there are separate pages for the Mesozoic and Cenozoic. For a lot of reasons it was easier to build separate databases for the two time periods, but it does get a little awkward with the few taxa that occur in both time periods.
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Comments (2)
There seems to be an issue with the Calciosolenia page in nannotax. It appears there are two alternative pages for this genus. In one, it looks like C. fossilis, C. huberi, C. sp. are not included as taxa (see page herein). In the other, the former taxa are included but C. alternans, C. aperta, C. brasiliensis, C. corsellii, C. murrayi, C. sp. are not represented.
Hi Rui
Yes, that is because there are separate pages for the Mesozoic and Cenozoic. For a lot of reasons it was easier to build separate databases for the two time periods, but it does get a little awkward with the few taxa that occur in both time periods.
Jeremy