Nannotax3 - ntax_cenozoic - Michaelsarsia <title>Nannotax3 - ntax_cenozoic - Michaelsarsia

Michaelsarsia


Classification: ntax_cenozoic -> Syracosphaerales -> Syracosphaeraceae -> Michaelsarsia
Sister taxa: Syracosphaera, Calciopappus, Michaelsarsia, Ophiaster

Daughter taxa (time control age-window is: 0-800Ma)
Michaelsarsia adriaticus
BCs oblong; whorl and link coccoliths with narrow opening
Michaelsarsia elegans
BCs elliptical; whorl and link coccoliths with wide opening
Michaelsarsia sp.
Specimens which cannot be assigned to established species

Taxonomy:

Citation: Michaelsarsia Gran, 1912
Rank: Genus
Type species: Michaelsarsia elegans Gran, 1912
Synonyms:

Distinguishing features:
Parent taxon (Syracosphaeraceae): BCs muroliths or placoliths with radial laths and axial structure, ofen with higlhy modified exothecal coccoliths
This taxon: Coccosphere with apical appendages formed from string of three highly-modified coccoliths, supported by whorl coccoliths

Farinacci & Howe catalog pages: Michaelsarsia * , Halopappus


Morphology:

Coccolith types:
  1. BCs - well calcified; broad rims with proximal flange; axial structure disjunct, formed of numerous small elements; laths bipartite (each formed of two elements with slight offset).
  2. CFCs - small, lenticular (nearly rhombic), with low spines.
  3. Whorl coccoliths - planoliths with circular central opening (often with organic cover) and asymmetric rim.
  4. Link coccoliths (osteoliths) - elongate, symmetrical, convex sided with spoon-shaped ends.
As in Calciopappus the arms can be found either radially extended or swept-back parallel to the main coccosphere, it is thought they form in the swept-back position and can be released into the radially extended position, possibly as a defence mechansim, Young et al. (2009).

Size:


Ecology & Biogeography


Biology & life-cycles

Phylogenetic relations

Search data:
LITHS: murolith, elliptical, CA: ca_disjunct, grill, plate, process,
CSPH: elongated, AAC, appendages, CFC, XC, CROSS-POLARS: R-prominent, T-prominent,
Lith size: 1.8->2.5µm; Coccosphere size: 10->20µm;
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 range of species in this database
First occurrence (base): at base of Gelasian Stage (0% up, 2.6Ma, in Piacenzian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

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

Lecal-Schlauder, J. (1951). Recherches morphologiques et biologiques sur les Coccolithophorides Nord-Africains. Annales de l'Institut Océanographique, Monaco & Paris. 26: 255-362. gs

Lohmann, H. (1912). Untersuchungen über das Pflanzen- und Tierleben der Hochsee, zugleich ein Bericht über die biologischen Arbeiten auf der Fahrt der "Deutschland" von Bremerhaven nach Buenos-Aires in der Zeit vom 7. Mai bis 7. September 1911. Veröffentlichungen des Instituts für Meereskunde an der Universität Berlin, Neue Folge. A. Geographisch-naturwissenschaftliche Reihe. 1: 1-92. gs V O

Young, J. R., Andruleit, H. & Probert, I. (2009a). Coccolith function and morphogenesis, insights from appendage-bearing coccolithophores of the family Syracosphaeraceae (Haptophyta). Journal of Phycology. 45: 213-226. gs

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Michaelsarsia compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 29-1-2023

Taxon Search:
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AphiaID: 235860 Nomenclatural data on WoRMS
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=851 Go to Archive.is to create a permanent copy of this page - citation notes
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