Coronosphaera mediterranea HOL hellenica type


Classification: Coccolithophores -> Holococcoliths -> flat-topped -> Coronosphaera HOL type -> Coronosphaera mediterranea HOL hellenica type
Sister taxa: C. multipora, C. mediterranea HOL gracillima type, C. mediterranea HOL hellenica type, C. mediterranea HOL wettsteinii type, H. vercellii, S. histrica HOL,

Short diagnosis: BCs with concentric structure and central boss; tube wall with hexagonal crystallite fabric, a row of perforations above base and a variable number of extra perforations.
CFCs with boss elevated into spine-like structure with three buttresses


Taxonomy:

Citation: Coronosphaera mediterranea (Lohmann 1902) Gaarder, in Gaarder & Heimdal, 1977 HOL hellenica type, sensu Cros et al., 2000
Rank: Form
Basionym: Zygosphaera hellenica Kamptner 1937

Farinacci & Howe catalog pages: Zygosphaera hellenica *

Short diagnosis: BCs with concentric structure and central boss; tube wall with hexagonal crystallite fabric, a row of perforations above base and a variable number of extra perforations.
CFCs with boss elevated into spine-like structure with three buttresses


Morphology remarks: Variation - on the distal surface the concentric ring structure may be clear or obscure; some specimens have two pores.
The concentric structure is similar to that of other holococcoliths traditionally included in Zygosphaera, notably including Syracosphaera bannockii holococcoliths, formerly called Z. bannockii. Possibly this indicates that Coronosphaera and S. bannockii are closely related but more likely the structure has evolved more than once.

Size: Liths ca. 2 µm long.

Biology & life-cycles: “Z. hellenica” coccoliths have been observed in culture to be formed by the alternate phase of a Coronosphaera mediterranea strain (Geisen et al. 2002; Houdan et al. 2004) and this has been further confirmed by field observation of combination coccospheres ( Karatsolis et al. 2014, Triantaphyllou et al. 2016)

Search data:
TagsLITHS: holococcolith, H: cavate, H: disk-like, elliptical, RIM: H: tube (Holos), CA: H: distal-cover, H: distal-cover-flat, H: fabric-concentric,
CSPH: ellipsoidal, spherical, CFC, CFC+bridge, polymorphic, V-UNITS: ds-surface, R-UNITS: rim,
MetricsLith size: 1.6->2.5µm; Coccosphere size: 8->11µm; Liths per sphere: 88->140
Sources: morphom data from Cros & Fortuño (2002) & Kleijne 1991
The morphological data given here can be used on the advanced search page. See also these notes

See also: Coronosphaera mediterranea ;

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:

Plot of occurrence data:

References:

Geisen, M.; Billard, C.; Broerse, A.T.C.; Cros, L.; Probert, I. & Young, J.R., (2002). Life-cycle associations involving pairs of holococcolithophorid species: intraspecific variation or cryptic speciation? European Journal of Phycology, 37: 531-550.

Houdan, A.; Billard, C.; Marie, D.; Not, F.; Sáez, A.G.; Young, J.R. & Probert, I., (2004). Flow cytometric analysis of relative ploidy levels in holococcolithophore-heterococcolithophore (Haptophyta) life cycles. Systematics and Biodiversity, 1(4): 453-465.

Kamptner, E., (1937). Neue und bemerkenswerte Coccolithineen aus dem Mittelmeer. Archiv für Protistenkunde, 89: 279-316.

Karatsolis, B.; Dimiza, M.D. & Triantaphyllou, M.V., (2014). Verification of the Coronosphaera mediterranea – “Zygosphaera hellenica” life-cycle association. Journal of Nannoplankton Research, 34(special): 45-46.

Triantaphyllou, M. & others, (2016). Coccolithophore combination coccospheres from the NE Mediterranean Sea: new evidence and taxonomic revisions. Micropaleontology, 61(6): 457-472.


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Coronosphaera mediterranea HOL hellenica type compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-12-2017

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Comments (2)

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Maria Triantaphyllou (Greece)
actually it is published in 2015
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Jeremy Young (UCL, UK)
OK I have updated the reference list. The publication date I have left as 2016 as the website gives the date for this issue as February 2016. Do you know if it was printed in 2015? Then again if there is no new taxonomy the exact date is not very important and it may be easiest to use the cover-date (which is 2015).
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Maria Triantaphyllou (Greece)
The correct reference for the new combination coccospheres is:

TRIANTAPHYLLOU, M.V, KARATSOLIS, B., DIMIZA, M.D., MALINVERNO, E., CERINO, F., PSARRA, S., JORDAN, R.W., YOUNG, J.R., 20156. Coccolithophore combination coccospheres from the NE Mediterranean Sea: new evidence and taxonomic revisions. Micropaleontology, 61(6): 457-472.
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