... (2009) the species concept used are: very small Gephyrocapsa for specimens <3 μm; Gephyrocapsa muellerae for specimens >3 μm with a low bridge angle; Gephyrocapsa caribbeanica for specimens >3 μm with an almost closed central area; Gephyrocapsa oceanica and Gephyrocapsa omega...

... ; G . muellerae — Gephyrocapsa muellerae ; VSG—very small Gephyrocapsa (<2 µm). ...

...* Gephyrocapsa ericsonii* G. muellerae G. oceanica* Gladiolithus flabellatus* Helicosphaera spp.* H. carteri* H. hyalina Michaelsarsia elegans Ophiaster spp.* Palusphaera spp. Papposphaera spp. Rhabdosphaera spp.* Syracosphaera spp.* S. anthos...

... (up to 20%) of coccolith Gephyrocapsa muellerae ( Fig. 2 a ). Currently, S. mirabilis is a subtropical to temperate taxon that is generally not encountered in regions with summer SSTs < 12 °C. In the North Atlantic, it is observed in the Mediterranean Sea, on the shelf off Portugal and France...

...% of the assemblage) and abundant Gephyrocapsa muellerae (57%–62%). In general, E . huxleyi has dominated the global nannoplankton assemblage for the past ∼73 k.y. (e.g., Flores et al., 2010 ), although Jordan et al. (1996) showed that the onset of this acme is diachronous and younger toward higher latitudes...

... by mediumsized gephyrocapsids at −27.8 m in P. Marina, −31.2 m in C.so Tukory and −31.5 m in the P. Resuttano site ( figs. 2–4 ) ( plate I, E–H ). Medium- sized gephyrocapsids belong to Gephyrocapsa caribbeanica , Gephyrocapsa muellerae and Gephyrocapsa oceanica which are difficult to distinguish in light...

... and conglomerates (unit 4–2). The following Pleistocene nannofossils were recovered: Gephyrocapsa muellerae , G. ericsonii , Reticulofenestra sp., and Syracosphaera pulchra at 150.2 m (unit 14); Sphenolithus abies , Gephyrocapsa ericsonii , and Coccolithus pelagicus at 125.4 m (unit 12); Gephyrocapsa...

... bigelowii ; CL— Calcidiscus leptoporus ; CM— Coronosphaera mediterranea ; CP— Coccolithus pelagicus spp. braarudii ; GM— Gephyrocapsa muellerae ; GO— Gephyrocapsa oceanica ; HC— Helicosphaera carteri ; Sy— Syracosphaera spp.; US— Umbilicosphaera sibogae . (B) Ideal atmospheric and oceanic conditions...

...). G . caribbeanica, Gephyrocapsa muellerae Breheret and Gephyrocapsa aperta Kamptner form the bulk of the nannofossil assemblage, whereas the planktonic, sinistral N . pachyderma, and the benthonic E. clavatum and Cassidulina reniforme Norvang dominate the foraminiferal record. The dinoflagellate cyst...

... Gephyrocapsa muellerae (cold) to Emiliania huxleyi Type A (warm). Additionally, we observed a period of coccolithophore community instability between 6 and 5 kyrs BP, characterised by reduced diversity and species richness. This instability may have been associated with a Mid-Holocene warm period...

... of the core. Occurrences of Gephyrocapsa spp. and Emiliania huxleyi were used to identify oxygen isotope stages (OIS) 1 and 5 (Fig. 3) . Emiliania huxleyi evolved during oxygen isotope stage (OIS) 8 ( Thierstein et al., 1977 ), but biostratigraphy indicates that this species did not appear...

... al. 2004 ). An essentially identical life-cycle has also been observed in Gephyrocapsa (Probert unpublished observation). Cros and Fortuno (2002) have illustrated combination cocco-spheres of Alisphaera with Polycrater and of Canistrolithus with Polycrater . These indicate that both...

... ( Verbeek 1990 ) Young and Westbroek 1991 ex Medlin and Green in Medlin et al. 1996 orth. emend. (23) Genus Gephyrocapsa Kamptner 1943 Gephyrocapsa caribbeanica Boudreaux and Hay in Hay et al. 1967 Gephyrocapsa crassipons Okada and McIntyre 1977 (24) Genus Emiliania Hay...

... (in approximate order of cell abundance): Gephyrocapsa oceanica , Florisphaera profunda , Oolithotus antillarum , Calciosolenia murrayi , Umbellosphaera irregularis , Emiliania huxleyi , Umbellosphaera tenuis , Calciopappus rigidus , and Algirosphaera robusta (text-fig. 3 ). Absolute abundances ranged...