Bekoma bidartensis


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

Taxonomy

Citation: Bekoma bidartensis Riedel and Sanfilippo 1971
Rank: species
Basionym: Bekoma bidartensis

Catalog entries: Bekoma bidartensis

Original description: Cephalis and thorax together campanulate, with three robust feet. Cephalis approximately hemispherical, with very thick wall, not marked off from the thorax externally. Cephalis seems generally poreless, but with numerous depressions resembling infilled pores. In some specimens the apical and vertical spines extend beyond the cephalic surface as two weak, oblique spines. Thorax campanulate, with somewhat rough surface, proximally narrow and forming a type of "neck" merging with the cephalis with no change in contour. Thoracic pores subcircular, smaller and sparser proximally. From (and slightly above) the distinct distal rim of the thorax arise three long, thick, subparallel cylindrical feet with an outwardly-directed thorn in the distal half. In many specimens, the feet are irregularly hollow distally. Fragments of latticed abdomen are commonly present.

(Based on 9 specimens) Length of cephalis plus thorax 145-165µm; maximum breadth of thorax 130-170µm. Distinguishing characters (rw): Specimens from Site 67, and some from the Upper Paleocene at Ibbaritz-Bidarf, have an outwardly directed thorn in the distal part of the robust rod which superficially resembles a foot. This thorn is evidently homologous with the terminal part of the straight foot of the form from Belus, and the structure distal from that is homologous with the inwardly-directed rod from which arise the bars that connect the three feet in some specimens.
Remarks on original description: NOTE: Spelling correction from Bekoma bidarfensis to Bekoma bidartensis in 2411:65

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:

Riedel, W. R. & Sanfilippo, A. (1971). Cenozoic Radiolaria from the western tropical Pacific, Leg 7. Initial Reports of the Deep Sea Drilling Project. 7: 1529-1666. gs


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

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