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Linked specimens: USNM-3913 USNM-3212
The trochoidal test is three chambered in the adult. The small initial portion is indistinct,coarsely cancellated, and it is almost impossible to recognize the individual early chambers and the details of arrangement. The subglobular chambers are rapidly increasing in size and the ultimate chamber is peripherally slightly flattened. The large semicircular umbilical main aperture lies at the intersection of the three sutures of the end chambers. In addition, a small rounded auxiliary Globigerinoides aperture exists, almost opposite the main aperture, in the corner between the initial portion and the two last chambers. Due to the masking effect of adhering matrix, the smalI Globigerinoides aperture is not always visible. Occasionally, and only discernible under higher magnification, a minute covering plate across the Globigerinoides aperture can be seen. In grown up individuals, this plate develops into a low chamberlike growth.
All the investigated specimens are characterized by low to slightly inflated supplementary chamberlike growths. The following types of arrangement can be distinguished:
a) Across umbilicus, covering the main aperture with 3 small semicircular openings situated at the sutures. Present in ail individuals.
b) Across umbilicus as described above, and additional similarly structured growth issuing from the Globigerinoides aperture.
The normal adult test shows this dual growth across umbilicus and over the Globigerinoides aperture. It is the pre-dominant type of arrangement.
c) Two chamberlike growths as described in b. The one over the umbilicus is spreading along the sutures forming 3 small, low "chamberlets," separated from the main growth by straight incisions. Each of the new "chamberlets" carries three small semicircular openings. This type is only rarely encountered.
The aperture of the adult Globigerinoita is multiple and in the typical case with maximum 6 small semicircular openings. In individuals with complex growths as described above, the maximum number of openings is 12. The openings have minute liplike borders. The walls of the preceding Globigerinoides chambers are thicker and the pores coarser than those of the supplementary "chambers," which occasionally are transparent.
The proportion of left and right hand coiling specimens is about 2:1 (19 specimens counted). The species has been encountered in only one sample. The specimens are common and well preserved.
Size: The maximum diameter of the test, including the chamberlike growth, was measured in 10 individuals. It varies from 220µ to 315µ
Etymology: The species is named after the district of Moruga, South Trinidad.
Globigerinoita morugaensis compiled by the pforams@mikrotax project team viewed: 23-7-2021
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