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Species Globorotalia (Jenkinsella) bella Jenkins 1967


Alternative name:
Globorotalia bella Jenkins 1967
Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test low trochospiral, equatorial periphery quinquelobate, axial periphery rounded, chamber ovate, inflated, five in the final whorl increasing uniformly in size as added, sutures on both umbilical and spiral side nearly radial, depressed; surface coarsely and uniformly perforate; smooth with circular pores; umbilicus small, narrow; aperture a rather low arch with a thick lip, interiomarginal, umbilical-extraumbilical.
Discussion / Comments:
Kennett & Srinivasan (1983):
Gr. (J.) bella is distinguished from Gr. (J.) semivera by its lower arched aperture and from Gr. (J.) siakensis by its lower arched aperture and axially compressed final chamber in peripheral view. Morphological similarity between Gr. (J.) bella and Gr. (J.) mayeri, especially with regard to the axially depressed final chamber in peripheral view, suggests a close phlyogenetic relationship. However, Gr. (J.) bella differs from Gr. (J.) mayeri in lacking distinctly curved sutures. It is probable that Gr. (J.) bella is an intermediate morphotype between Gr. (J.) siakensis and Gr. (J.) mayeri. It resembles Gr. (J.) siakensis in having almost radial sutures and resembles Gr. (J.) mayeri in having an axially depressed final chamber in peripheral view.
Synonym list:
Kennett & Srinivasan (1983):
1967 Globorotalia bella Jenkins. - Jenkins : p.1069 fig 3 nos 1-6
References:

Jenkins,D.G. (1967):
Planktonic foraminiferal zones and new taxa from the lower Miocene to the Pleistocene of New Zealand . N. Z. J. Geol. Geophys. Vol. 10(4) p. 1064-1078

Kennett,J. and Srinivasan,M.S. (1983):
Neogene Planktonic Foraminifera - A Phylogenetic Atlas.

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