Syracosphaera ossa


Classification: ntax_cenozoic -> Syracosphaerales -> Syracosphaeraceae -> Syracosphaera -> SY molischii gp -> molischii type -> Syracosphaera ossa
Sister taxa: S. andruleitii, S. molischii, S. hastata, S. marginiporata, S. ossa, S. epigrosa

Daughter taxa (time control age-window is: 0-800Ma)
Syracosphaera ossa type 1
BCs without axial structure, XCs with long flange extensions.
Syracosphaera ossa type 2
BCs with axial ridge, XCs with moderate length flange extensions

Taxonomy:

Citation: Syracosphaera ossa (Lecal 1966) Loeblich & Tappan, 1968
Rank: Species
Basionym: Syracolithus ossa Lecal 1966
Variants: Two sub-types are present and seem to be consistently differentiable (our obs.):
Type 1 - BCs without axial structure, XCs with long flange extensions. (This form corresponds to the holotype of Lecal.
Type 2 - most BCs with axial ridge, XCs with moderate length flange extensions.

Distinguishing features: BCs with broad smooth rim

Farinacci & Howe catalog pages: S. ossa *


Morphology:
BCs - placolith like with broad smooth distal flange. Ridge-like central mass often present and can almost fill central area. BCs usually vary greatly in size on coccosphere.
CFCs - smaller than BCs and rim narrower; spine well developed (ca. 1.5 µm tall), formed of four blades (cruciform in cross section), typically with blades parallel to long axis extended to form wide flat spine.
AAC - One BC type lith with a quadrate spine often present (stem narrower than CFCs). XCs - rim smooth, flange expanded into broad apically directed wing and long antapically directed wing.

Search data:
TagsLITHS: murolith, placolith, SHAPE: elliptical, CA: ca_disjunct, grill, plate, process,
CSPH: equant, CFC, XC, CROSS-POLARS: R-prominent, T-prominent,
MetricsLith size: 1.5->2.5µm; Coccosphere size: 5->10µm; Liths per sphere: 30->60
Data source notes: lith length (BCs) from OD & illustrated specimens; csph data from Cros & Fortuño 2003; 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:

Cros, L. & Fortuño, J. -M. (2002). Atlas of northwestern Mediterranean coccolithophores. Scientia Marina. 66: 1-186. gs V O

Lecal, J. (1966). Coccolithophorides littoraux de Banyuls. Vie et Milieu. 16: 251-270. gs

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


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Syracosphaera ossa compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 14-5-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1381 Go to Archive.is to create a permanent copy of this page - citation notes



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