Helicosphaera compacta
Classification: Coccolithophores -> Zygodiscales -> Helicosphaeraceae -> Helicosphaera -> H. lophota group -> Helicosphaera compacta
Sister taxa: H. clarissima, H. compacta, H. disrupta, H. reticulata, H. robinsoniae, H. bramlettei, H. lophota, H. papillata, H. prolixa, H. seminulum, H. wilcoxonii,
Distinguishing features: Elliptical Helicosphaera with well defined birefringent blanket in XPL and narrow central area spanned by a conjunct bar.
Theodoridis84_compacta.jpg
Bown_2005_JNR_pl11-fig18.jpg
Bown_2005_JNR_pl11-fig16.jpg
BownandDJ2012_JNR_pl6-fig26.jpg
Boesiger et al 2017 fig3-34.jpg
Boesiger et al 2017 pl03 16-17.JPG
BownNewsam 2017 pl05 42.JPG
BownNewsam 2017 pl14 19.JPG
Bown_2005_JNR_pl11-fig17.jpg
Bown_2005_JNR_pl11-fig19.jpg
Bown_2005_JNR_pl11-fig20.jpg
Bown_2005_JNR_pl11-fig21.jpg
Bown_2005_JNR_pl11-fig22.jpg
Bown_2005_JNR_pl11-fig23.jpg
Bown_2005_JNR_pl11-fig24.jpg
Bown_2005_JNR_pl11-fig25.jpg
BownandDJ2012_JNR_pl6-fig27.jpg
BownandDJ2012_JNR_pl6-fig28.jpg
Dunkley Jones et al 2009_pl5-fig1.jpg
Dunkley Jones et al 2009_pl5-fig2.jpg
Haq73pl2-6.JPG
Haq73pl7-2.JPG
PN71 KDansk pl34-06.JPG
Theod84 pl16-06.JPG
Theod84 pl16-07.JPG
Theod84 pl16-08.JPG
Varol1998_7-05-16.jpg
Young1998_compacta.jpg
deKaenelVilla96pl09 f02.JPG
deKaenelVilla96pl09 f08-11.JPG
Taxonomy:
Citation: Helicosphaera compacta Bramlette & Wilcoxon, 1967Rank: SpeciesVariants: Helicosphaera moorkensii Steurbaut, 1983 - closed central area (no pores) - NP23
Farinacci & Howe catalog pages: Helicosphaera compacta * Helicosphaera moorkensii *
Distinguishing features: Elliptical Helicosphaera with well defined birefringent blanket in XPL and narrow central area spanned by a conjunct bar.
Search data:
| Tags | LITHS: placolith, asymmetric, RIM: wing, CA: bar-transverse,
CSPH: ellipsoidal, varimorphic, V-UNITS: distal shield, R-UNITS: blanket, c-str, px-plate, DETAILS: ca_conjunct, rim-bicyclic, isogyres kinked, isogyres oblique, isogyres separated, |
| Metrics | Lith size: 10->15µm;
Sources: |
The morphological data given here can be used on the advanced search page. See also these notes
Geological Range:
Last occurrence (top): within NP24 zone (26.84-29.62Ma, top in Chattian stage). Data source: de Kaenel & Villa, 1996; Boesiger et al 2017
First occurrence (base): within NP16 zone (40.40-42.87Ma, base in Lutetian stage). Data source: [PRB rough estimate]
Plot of occurrence data:
- Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
- Triangles indicate an event for which a precise placement has been suggested
- Histogram - Neptune occurrence data from DSDP and ODP proceedings. Interpret with caution & read these notes
- Taxon plotted: Helicosphaera compacta, synonyms included - Helicopontosphaera compacta; Helicosphaera compacta; space-time plot ::
Samples map :: Parent: H. lophota group
References:Bramlette, M.N. & Wilcoxon, J.A., (1967). Middle Tertiary calcareous nannoplankton of the Cipero section, Trinidad, W.I. Tulane Studies in Geology and Paleontology, 5: 93-131.
Steurbaut, E., (1983). The stratigraphic position of the Lower Oligocene Yrieu Sainds (SW France, based on calcareous nannofossils and a new Helicosphaera species. Eclogae Geologicae Helvetiae, 76(2): 327-331.
