Blackites gladius


Classification: Coccolithophores -> Syracosphaerales -> Rhabdosphaeraceae -> Blackites -> B. inflatus group -> Blackites gladius
Sister taxa: B. aktulagayensis, B. bullatus, B. creber, B. culter, B. flammeus, B. fustis, B. gladius, B. globosus, B. herculesii, B. inflatus, B. kilwaensis, B. ornatus, B. piriformis, B. pseudomorionum, B. rotundus, B. rugosus, B. sextonii, B. turritus, B. virgatus,

Distinguishing features: Rhabdoliths with hollow ampulliform spines with a prominent basal collar and narrow base, widening to a maximum around three quarters of the way up, then taper to a point; the upper half of the spines display a distinctive striated pattern. The basal coccoliths are broad, the spine width is usually around half the coccolith width.


Taxonomy:

Citation: Blackites gladius (Locker, 1967) Varol, 1989
Rank: Species
Basionym: Rhabdosphaera gladius Locker, 1967
Notes & discussion: Similar to B. creber but with a broader, more inflated spine. Blackites rotundus has similar morphology but has a more globose spine. The rim structure is distinctly different to other coccoliths with similar spine morphologies, such as Blackites bullatus.

Farinacci & Howe catalog pages: Rhabdosphaera gladius *

Distinguishing features: Rhabdoliths with hollow ampulliform spines with a prominent basal collar and narrow base, widening to a maximum around three quarters of the way up, then taper to a point; the upper half of the spines display a distinctive striated pattern. The basal coccoliths are broad, the spine width is usually around half the coccolith width.

Search data:
TagsLITHS: planolith, elliptical, CA: grill, PROCESS: bulbous, hollow, length-slow, spine, tiered,
CSPH: not known, DETAILS: ca_disjunct,
MetricsLith size: 6->12µm;
Sources: lith size (spine height) from OD & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: The top of R. gladius was used to define the NP15/16 boundary, but Perch-Niesen (1985) remarked that it was "often absent and thus of little use". Bown (2005) records R. gladius as high as NNP17.
Last occurrence (top): at top of NP15 zone (100% up, 42.9Ma, in Lutetian stage). Data source: zonal marker (see Perch-Nielsen 1985) - but not very reliable
First occurrence (base): within NP14 zone (46.29-49.11Ma, base in Ypresian stage). Data source: Bown 2005

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
  • Taxon plotted: Blackites gladius, synonyms included - Blackites gladius; Rhabdolithus gladius; Rhabdosphaera gladius; space-time plot :: Samples map :: Parent: B. inflatus group

    References:

    Bown, P.R., (2005). Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research, 27(1): 21-95.

    Locker, S., (1967). Neue, statigraphisch wichtige Coccolithophoriden (Flagellata aus dem norddeutschen Altetiar). Monatsber. Deutsch. Akad. Wiss. Berlin, 9(9/10): 758-769.

    Varol, O., (1989). Eocene calcareous nannofossils from Sile (northwest Turkey). Revista Española de Micropaleontología, 21: 273-320.


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    Blackites gladius compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-12-2018

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=106Go to Archive.is to create a permanent copy of this page - citation notes



    Comments (1)

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    Rui

    I am confused with the following description on the short diagnosis - "The coccoliths are broad, and the spine is usually around half the width with a prominent basal collar".

    Gravatar
    Jeremy Young (UK)

    -agreed that it is not clear, i will reword it.

    all the best Jeremy

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