Gephyrocapsa small


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

Short diagnosis: Gephyrocapsa <3µm long - not usually identifiable to species level by light microscopy


Taxonomy:

Citation: Gephyrocapsa small
Rank: Species
Variants: Small Gephyrocapsa species which have been decribed in the literature include
Extant species (detailed on other pages) Fossil species (combined here)
Notes & discussion: Small Gephyrocapsa coccoliths show diverse morphologies and probably include many species. It is not practical to identify them by light microscopy so they are typically simply refered to the informal category ""small Gephyrocapsa"". Alternatively the names G. aperta, or in the Late Quaternary G. ericsonii are often used in the same sense.

Farinacci & Howe catalog pages: Bramletteius duoalatus * Gephyrocapsa aperta * Gephyrocapsa mediterranea * Gephyrocapsa pelta * Gephyrocapsa protohuxleyi * Gephyrocapsa rota * Gephyrocapsa sinuosa * Gephyrocapsa small [no catalog entry yet]Gephyrocapsa theyeri *

Short diagnosis: Gephyrocapsa <3µm long - not usually identifiable to species level by light microscopy

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: 1.5->3µm;
Sources:
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Small Gephyrocapsa is abundant in a short interval in the mid Pliocene but becomes much rarer in the Late Pliocene (NN16-18), they are common throughout the Pleistocene.  Small Gephyrocapsa specimens are also present in the plankton but the identification is usually only used for fossil specimens.
The first occurrence of small Gephyrocapsa is hard to place as the earliest forms are often hard to definitively identify by light microscope. The earliest well-supported record is that of Triantaphyllou (2000) from the Messinian of Greece.
Last occurrence (top): within MIS-2 Isotope stage (0.02-0.05Ma, top in Tarantian stage). Data source:
First occurrence (base): within Messinian Stage (5.33-7.25Ma, base in Messinian stage). Data source: Triantaphyllou (2000)

Plot of occurrence data:

References:

Gartner, S., (1977). Calcareous nannofossil biostratigraphy and revised zonation of the Pleistocene. Marine Micropaleontology, 2: 1-25.

Hay, W.W. & Beaudry, F.M., (1973). Calcareous nannofossils - Leg 15. Initial Reports of the Deep Sea Drilling Project, 15: 625-684.

Heimdal, B.R., (1973). Two new taxa of Recent coccolithophorids. "Meteor" Forschungsergebnisse. Reihe D, Biologie(13): 70-75.

Kamptner, E., (1963). Coccolithineen-Skelettreste aus Tiefseeablagerungen des Pazifischen Ozeans. Annalen des Naturhistorischen Museums in Wien, 66: 139-204.

Martini, E., (1981). Oligocene to Recent calcareous nannoplankton from the Philippine Sea, Deep Sea Drilling Project Leg 59. Initial Reports of the Deep Sea Drilling Project, 59: 547-565.

Martini, E., (1993). Emiliania coronata, a new calcareous nannoplankton species from the North Atlantic Pleistocene. Zitteliana, 20: 87-92.

McIntyre, A. & Bé, A.W.H., (1967). Modern Coccolithophoridae of the Atlantic Ocean - I. Placoliths and Cyrtholiths. Deep-Sea Research and Oceanographic Abstracts, 14: 561-597.

Pirini Radrizzani, C. & Valleri, G., (1977). New data on calcareous nannofossils from the Pliocene of the Tyrrhenian Basin Site 132, DSDP Leg 13. Rivista Italiana di Paleontologia, 83(4): 897-924.

Pujos, A., (1987). Late Eocene to Pleistocene medium-sized and small-sized "Reticulofenestrids". Abhandlungen der Geologischen Bundesanstalt, 39: 239-277.

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

Triantaphyllou 2000 [sorry, not in our bibliography yet]


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Gephyrocapsa small compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-10-2017

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Comments (1)

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Mike Styzen (Noble Energy, US)
GOM Pleistocene marker: On the charts I published for the Gulf of Mexico (Styzen 1996, Styzen and Jolley 2008) I have a marker (NP 1.58 in the Shell US nomanclature) based on the first major acme (downhole) of small Gephyrocapsa which also contains common Pseudoemiliania spp. This event features Small Gephyrocapsa in probably it's greatest abundance with literally thousands per field of view. From the looks of things The age dates assigned to this part of the section on the 2008 chart (available in Time Scale Creator Pro) are a little off. The event falls between the extinctions of Helicosphaera sellii (see my remarks on that too) and that of \large"Gephyrocapsa (which is an event I've never been able to get to work very well). That would put it between 1.34 and 1.46 ma on the Gradstein, Ogg and Smith timescale."""
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