Syracosphaera borealis


Classification: ntax_cenozoic -> Syracosphaerales -> Syracosphaeraceae -> Syracosphaera -> SY molischii gp -> borealis type -> Syracosphaera borealis
Sister taxa: S. borealis, S. exigua, S. pemmadiscus, S. strigilis

Taxonomy:

Citation: Syracosphaera borealis Okada & McIntyre, 1977
Rank: Species
Taxonomic discussion: Young et al. 2003 recognised two variants within S. borealis - type 1 and type 2, the type 2 variant has now been decribed as a separate species, S. hirsuta

Distinguishing features: BCs with smooth rim - axial structure prominent irregular ridge or ring; XCs smooth eliptical discs, rare

Farinacci & Howe catalog pages: S. borealis *


Morphology:
BCs - distal flange moderately broad, slightly flaring, with low sutural ridges; axial structure - irregular ridge or cluster of nodes formed by upgrowth from laths.
XCs - small, folded into saddle-shape; rim, narrow, symmetrical (no wing development). Usually only a few observed or absent. Can show arcuate openings at the ends of the central area but these are often not present, or possibly obscured by organics.

Size: Coccospheres 6-8 µm /BCs 1.5-2.5 µm


Ecology & Biogeography: A common sub-Arctic species

Search data:
TagsLITHS: murolith, placolith, SHAPE: elliptical, CA: ca_disjunct, grill, plate,
CSPH: equant, XC, CROSS-POLARS: R-prominent, T-prominent,
MetricsLith size: 1.5->3µm; Coccosphere size: 8->10µm; Liths per sphere: 30->50
Data source notes: csph & lith length (BCs) from OD & illustrated specimens; lith numbers from Yang & Wei 2003, range of estimates
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: 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:

References:

Meier, K. J. S., Kinkel, H. & Young, J. R. (2014b). A note on calcareous nannoplankton from the Kieler Förde (Baltic Sea). Journal of Nannoplankton Research. 33(1): 29-37. gs V O

Okada, H. & McIntyre, A. (1977). Modern coccolithophores of the Pacific and North Atlantic Oceans. Micropaleontology. 23(1): 1-55. gs

Thomsen, H. A. (2016). Baltic Sea coccolithophores – an overview of insights into their taxonomy and ecology from the last 40 years. Journal of Nannoplankton Research. 36(2): 97-119. gs V O

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


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Syracosphaera borealis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-4-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1348 Go to Archive.is to create a permanent copy of this page - citation notes



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