Centrobotrys gravida


Classification: rads_cenozoic -> Cannobotryidae -> Botryocyrtidae -> Centrobotrys -> Centrobotrys gravida
Sister taxa: C. gravida, C. petrushevskayae, C. thermophila, C. sp.

Taxonomy

Citation: Centrobotrys gravida Moore 1971
Rank: species
Basionym: Centrobotrys gravida
Taxonomic discussion: Moore 1971

Catalog entries: Centrobotrys gravida

Original description: Internal [eucephalic] lobe heavy, spherical with no observable pores. The arrangement of the internal spines and axial rod appears to be as illustrated by Nigrini (1967, p.50) for C. thermophila. However, only the ventral spine forms a pronounced opening in the outer cephalic wall. Outer shell, heavy and rough with irregularly arranged subcircular pores. Pores vary in size but are generally largest in the equatorial region of the spherical to subspherical thorax. [Collar] stricture marked; thorax closed.

Maximum length 128-166 µ. Maximum breadth 75-113 µ. Distinguishing characters (rw): Thick-walled form with closed inflated thorax. (Riedel and Sanfilippo, 1978a)

C. gravida is more coarsely porous than other species of the genus, and differs in having a thicker shell. Sanfilippo et al., 1985) Phylogeny (rw): The ancestry of this species is not yet known, but C. petrushevskayae is clearly its descendant.
Remarks on original description: The eucephalic chamber is located equidistantly from either side of the integrated ante- and post-cephalic chambers; the outline of the latter is generally semicircular, but in occasional specimens it tends to be bluntly pointed apically. The closed, globular thorax may be of the same size as the total cephalic structure, but is usually larger. (Sanfilippo et al., 1985)

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:

Moore, T. C. Jr. (1971). Radiolaria. Initial Reports of the Deep Sea Drilling Project. 8: 727-774. gs


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Centrobotrys gravida compiled by the radiolaria@mikrotax project team viewed: 6-3-2021

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