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Globigerinoita morugaensis Brönnimann 1952 |
Current identification:
Test almost spherical, in the adult composed of a three chambered Globigerinoides and two supplementary chamberlike growths. Main aperture,large, arcuate, umbilical, at the intersection of the su-tures of the three lastformed chambers. Single, additional Globigerinoides aperture small, semicircular, approximately opposite the main aperture between the two last formed chambers and the closely coiled initial portion of test. Supplementary "chambers" or chamberlike growths cover the main aperture, 'and in grown up individuals also the Globigerinoides aperture. The umbilical growth forms in the last ontogenetic stage occasionally small additional "chamberlets," separated from the main growth by fairly deep incisions. Aperture in the adult multiple, consisting of up to 12 small, rounded openings situated at the sutural grooves. In general, there are 3 openings from the umbilical growth and 2 to 3 from the growth across the Globigerinoides aperture. Where additional "chamberlets" are issued from the umbilical growth, the number of openings is further augmented by 3 per "chamberlet."
Original Description
Extra details from original publication
In addition, also the structure of the supplementary "chambers" is different in the various genera.
Globigerinita (1951,p.18) and likewise the primitive Globigerinatella type described under a) (1950, p. 81) have only one single, usually branching supplementary "chamber" with numerous minute semicircular openings not restricted to the sutural grooves, whereas Globigerinoita possesses in the well developed adult exactly two chamberlike growths. Occasionally, additional "chamberlets" are formed, each with at the most 3 semicircular openings situated at the sutural grooves. The Upper Eocene Globigerinatheka differs from Globigerinoita by a composite system of supplementary chambers, consisting of a large inflated growth across the umbilicus and of 3 small and low chamberlike growths.
Brönnimann, P. (1952a). Globigerinoita and Globigerinatheka, new genera from the Tertiary of Trinidad, B.W.I. Contributions from the Cushman Foundation for Foraminiferal Research. 3(1): 25-28. gs References:
Globigerinoita compiled by the pforams@mikrotax project team viewed: 12-1-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=130905 Go to Archive.is to create a permanent copy of this page - citation notes |
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