Bekoma oliva


Classification: rads_cenozoic -> Theoperidae -> Bekomidae -> Bekoma -> Bekoma oliva
Sister taxa: B. bidartensis, B. campechensis, B. demissa, B. divaricata, B. helenae, B. oliva, B. sp.

Taxonomy

Citation: Bekoma oliva Nishimura 1992
Rank: species
Basionym: Bekoma oliva

Catalog entries: Bekoma oliva

Original description: Shell of two segments with three feet. Cephalis subspherical, with small, scattered, subcircular pores, slightly roughened with tiny nodes, bearing two horns (apical and vertical). Collar stricture well defined externally with six collar pores internally. Cephalic structure has A, V, MB, two L, two l and D; two L and D extend into the three feet as thin ribs. Thorax hemispherical to campanulate, with subcircular or circular pores regular in size and form, and with smooth surface. Three stout, bladed and grooved feet depend from the distal part of thorax; these are rather straight, having short branches distally which are often joined to the branches of the adjacent feet.

Based on 10 specimens. Height of cephalis and thorax 96-150 µ, maximum width of thorax 90-132 µ, of cephalis 32-42 µ, length of feet 70-85 µ. Distinguishing characters (rw): This species is distinguished from other species of the genus Bekoma by having apical horns and terminal feet three-bladed in cross section, and a latticed cephalis penetrated with many small pores. This species may be related to Pterocanium (?) procerum or Thyrsocyrtis (?) annikae, but it is distinguished from the two latter by lacking a third segment and by having three massive, deeply grooved feet.

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Paleogene Period (23.03-66.04Ma, top in Chattian stage). Data source: Lazarus et al. 2015 - "P age group"
First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Lazarus et al. 2015 - "P age group"

Plot of occurrence data:

References:


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Bekoma oliva compiled by the radiolaria@mikrotax project team viewed: 22-10-2020

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