Helicosphaera lophota


Ancestry: Coccolithophores -> Zygodiscales -> Helicosphaeraceae -> Helicosphaera -> H. lophota group -> Helicosphaera lophota
Sister taxa: H. bramlettei, H. clarissima, H. compacta, H. lophota, H. neolophota, H. papillata, H. reticulata, H. robinsoniae, H. seminulum, H. wilcoxonii,

Short diagnosis: Elliptical, oblong or reniform Helicosphaera with wide flange and central area spanned by a broad, near-longitudinal disjunct bar with distinct median suture.


Taxonomy:

Citation: Helicosphaera lophota (Bramlette & Sullivan, 1961) Locker, 1973
Rank: Species
Basionym: Helicosphaera seminulum lophota Bramlette & Sullivan, 1961

Farinacci & Howe catalog pages: Helicosphaera seminulum lophota *

Short diagnosis: Elliptical, oblong or reniform Helicosphaera with wide flange and central area spanned by a broad, near-longitudinal disjunct bar with distinct median suture.

Geological Range:
Last occurrence (top): within NP18 zone (36.97-37.32Ma, top in Priabonian stage). Data source: Theodoridis (1984) Perch-Nielsen (1985)
First occurrence (base): within NP12 zone (50.50-53.70Ma, base in Ypresian stage). Data source: Theodoridis (1984) Perch-Nielsen (1985)

Plot of occurrence data:

References:

Bramlette, M.N. & Sullivan, F.R., (1961). Coccolithophorids and related nannoplankton of the Early Tertiary in California. Micropaleontology, 7(129-188).

Locker, S., (1973). Coccolithineen aus dem Paläogen Mitteleuropas. Paläobotanik, 3: 735-836.

Perch-Nielsen, K., (1985). Cenozoic calcareous nannofossils. In: Bolli, H.M., Saunders, J.B. and Perch-Nielsen, K. (Editors), Plankton Stratigraphy. Cambridge University Press, Cambridge, pp. 427-555.

Theodoridis, S., (1984). Calcareous nannofossil biostratigraphy of the Miocene and revision of the helicoliths and discoasters. Utrecht Micropaleontological Bulletin, 32: 1-271.


Nannotax3 - Coccolithophores - Helicosphaera lophota by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-3-2017

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Simun Ascic (Zagreb University, Croatia)
Is this \Helicosphaera lophota", on first image, maybe H. bramlettei?

[I am not sure now which image this comment refered to - but some intermediate speciemens between these taxa do seem to occur - JRY March 2014]"""
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