Gephyrocapsa muellerae


Classification: Coccolithophores -> Isochrysidales -> Noelaerhabdaceae -> Gephyrocapsa -> Gephyrocapsa muellerae
Sister taxa: G. oceanica, G. muellerae, G. ornata, G. ericsonii, G. sp elevated bridge, G. caribbeanica, G. omega, G. lumina, G. small, G. sp.,

Taxonomy:

Citation: Gephyrocapsa muellerae Bréhéret, 1978
Rank: Species
Variants: Gephyrocapsa margerelii Bréhéret, 1978 - narrower bridge and further from long axis
Synonyms: Gephyrocapsa oceanica var. californiensis Kamptner 1956. NB This sub-species was described without illustration, latin diagnosis, or designation of a holotype - but it was valid since it a non-fossil taxon described prior to 1958. Hence it has priority if the taxon is treated as a variety of G. oceanica. If, however, the taxon is regarded a discrete species then G. muellerae has priority (cf. Art. 11.2of the ICN). Bollmann & Klaas 2008 use the name G. oceanica ssp. californiensis but all other authors use the name G. muellerae.
Notes & discussion: In older literature on living nannoplankton G. muellerae is often refered to as G. caribbeanica.

Distinguishing features: Intermediate size species of Gephyrocapsa; bridge at high angle to short axis; central area rather small.

Farinacci & Howe catalog pages: Gephyrocapsa muellerae * , Gephyrocapsa oceanica californiensis * , Gephyrocapsa margereli *


Size: Coccospheres, 5 to 9 µm; coccoliths, 3 to 4 µm long.

Ecology & Biogeography: A cold water species, usually dominates Gephyrocapsa assemblages at temperate latitudes. Best known from the North Atlantic but also occurs in the South Atlantic and SE Pacific.

Search data:
TagsLITHS: placolith, elliptical, CA: bridge, bridge-diagonal, grill,
CSPH: spherical, monomorphic, V-UNITS: none, R-UNITS: all, c-str, distal shield, prox shield, tube, DETAILS: ca_conjunct, isogyres kinked, isogyres oblique, rim-unicyclic,
MetricsLith size: 3->4µm; Coccosphere size: 5->8µm; Liths per sphere: 14->22
Sources: morphom data from Cros & Fortuño 2003 & illustrated specs
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Common from MIS7 to MIS1 (Holocene). Frequently dominates higher latitude assemblages in MIS4-6, then is replaced by Emiliania huxleyi.
Last occurrence (top): Extant Data source: present in the plankton (Young et al. 2003)
First occurrence (base): within NN20 zone (0.29-0.44Ma, base in Ionian stage). Data source: [JRY rough estimate]

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Gephyrocapsa muellerae, synonyms included - Gephyrocapsa californicus; Gephyrocapsa californiensis; Gephyrocapsa margarelii; Gephyrocapsa margerelii; Gephyrocapsa margerelii/muellerae; Gephyrocapsa muellerae; Gephyrocapsa oceanica var. californiensis; Gephyrocapsa muellerae (>4 µm); Gephyrocapsa muellerae (3-4 µm);
  • space-time plot :: Samples map :: Parent: Gephyrocapsa

    References:

    Bollmann, J. & Klaas, C. (2008). Morphological variation of Gephyrocapsa oceanica Kamptner 1943 in plankton samples, implications for ecologic and taxonomic interpretations. Protist. 159: 369-381. gs

    Bréhéret, J. G. (1978). Formes nouvelles quaternaries et actualles de la famille des Gephyrocapsaceae (Cocolithophorides). Comptes Rendus Hebdomadaires des Séances de l'Académie des Sciences. Paris. Série D - Sciences Naturelles. 287: 447-449. gs

    Kamptner, E. (1956b). Das Kalkskelett von Coccolithus huxleyi (Lohmann) Kamptner und Gephyrocapsa oceanica Kamptner (Coccolithineae). Archiv für Protistenkunde. 101: 171-202. gs

    Matsuoka, H. & Okada, H. (1989). Quantitative analysis of Quaternary nannoplankton in the subtropical Northwestern Pacific Ocean. Marine Micropaleontology. 14: 97-118. gs

    Matsuoka, H. & Okada, H. (1990). Time-progressive morphometric changes of the genus Gephyrocapsa in the Quaternary sequence of the tropical Indian Ocean, Site 709. Proceedings of the Ocean Drilling Program. Scientific Results. 115: 255-270. gs

    Samtleben, C. (1980). Die Evolution der Coccolithophoriden-Gattung Gephyrocapsa nach Befunden im Atlantik. Paläontologische Zeitschrift. 54: 91-127. gs

    Wei, W. & Wise, S. W. (1992a). Oligocene-Pleistocene calcareous nannofossils from Southern Ocean Sites 747, 748, and 751. Proceedings of the Ocean Drilling Program. Scientific Results. 120: 509-521. 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, Special Issue. 1: 1-132. gs


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    Gephyrocapsa muellerae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-11-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=612 Go to Archive.is to create a permanent copy of this page - citation notes



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